Analysis of Dietary Intake and Body Composition of Collegiate Runners / Análisis de la Ingesta Dietética y Composición Corporal de Corredores Universitarios

SUMMARY: The aim of this cross-sectional study was to compare dietary intake to published recommendations and to analyze the potential relationship between body composition and dietary intake in collegiate athletes. Eighteen healthy male middle- and long- distance runners (age 20.11 ± 2.72 y; height, 174.7 ± 6.1 cm; body mass, 64.0 ± 7.7 kg), were recruited from a Mexican university track and field team at the beginning of the general preparation phase for national competitions. Participants completed three 24-hour dietary recalls, which were used to estimate dietary intake. Body composition was measured by Dual-energy X-ray absorptiometry (DXA). Athletes displayed high body fat values. Protein intake was significantly higher than published recommendations. Iron, zinc, sodium, and vitamin C intake were significantly higher than recommended values, while potassium and calcium intake were below established recommendations. No significant correlations between body composition variables (i.e body fat, lean body mass, bone mineral content) and dietary intake (i.e energy, macronutrients and selected vitamins and minerals) could be found. These findings suggest that coaches and practitioners should pay close attention to dietary intake and body composition of endurance athletes starting general preparation for competition. Future studies on changes of dietary intake and body composition during off-season and competitive phase, which also track physical activity, are warranted.

El objetivo de este estudio transversal fue comparar la ingesta dietética con las recomendaciones publicadas y analizar la relación potencial entre la composición corporal y la ingesta dietética en corredores universitarios. Dieciocho atletas masculinos sanos de media y larga distancia (edad 20,11 ± 2,72 años; altura, 174,7 ± 6,1 cm; masa corporal, 64,0 ± 7,7 kg), fueron reclutados de un equipo de atletismo de una universidad mexicana al comienzo de la fase de preparación general de competiciones nacionales. Los participantes completaron tres recordatorios dietéticos de 24 horas, que se utilizaron para estimar la ingesta dietética. La composición corporal se midió mediante absorciometría de rayos X de energía dual (DXA). Los atletas mostraron altos valores de grasa corporal. La ingesta de proteínas fue significativamente mayor que las recomendaciones publicadas. La ingesta de hierro, zinc, sodio y vitamina C fue significativamente superior a los valores recomendados, mientras que la ingesta de potasio y calcio estuvo por debajo de las recomendaciones establecidas. No se encontraron correlaciones significativas entre las variables de composición corporal (es decir, grasa corporal, masa corporal magra, contenido mineral óseo) y la ingesta dietética (es decir, energía, macronutrientes y vitaminas y minerales seleccionados). Estos hallazgos sugieren que los entrenadores y los practicantes deberían prestar mucha atención a la ingesta dietética y la composición corporal de los atletas de resistencia que comienzan la preparación general para la competencia. Se justifican estudios futuros sobre los cambios en la ingesta dietética y la composición corporal durante la fase fuera de temporada y competitiva, como también un seguimiento de la actividad física.

Effects of pre-exercise ingestion of different amounts of carbohydrate at three hours after feeding breakfast on exercise-induced hypoglycemia / 体力科学

The purpose of this study was to compare effects of different amounts of carbohydrate (CHO) in beverage on plasma glucose (GLU) concentration during exercise after feeding breakfast. Seven healthy Japanese male subjects performed 30-min cycling at an intensity on the 75% of maximal load at 3-h after feeding breakfast under 3 types of CHO (0 g, 30 g and 150 g) beverage conditions. The subjects ingested 500 mL of beverage dissolved each amount of glucose at 30-min before the exercise. The GLU concentrations were measured at 35- and 10-min before the exercise and every 5-min during the exercise. The minimum GLU concentrations under the 30 g condition for all subjects were lower than a criterion for hypoglycemic (72 mg / dL). The mean value also fell below the criterion at from 10- to 20-min during exercise. The minimum GLU concentration under the 150 g condition of only one subject was lower than the criterion, but the mean value did not fall below the criterion. Significant negative correlations were found between the subjects’ maximum oxygen uptake (VO2max) and the decreases in GLU concentration from maximum to minimum under both the 30 g (r = -0.947, p < 0.01) and 150 g conditions (r = -0.884, p < 0.01). This study clarified that feeding breakfast at 3-h before the exercise followed by the 30 g CHO beverage ingestion at 30 min before the exercise induced exercise-induced hypoglycemia, and that the subjects with higher VO2max had the greater decreases in GLU concentration.

Knowledge, attitude, practice (KAP) and dietary intake of young university athletes following sports nutrition education

@#Introduction: Nutrition plays a vital role in sports. Athletes must understand the importance of diet and ensure that they meet the nutrient requirements to enhance sports performance. The lack of understanding in sports nutrition will lead to poor dietary practices that can cause detrimental effects on athletic achievements. This study aims to evaluate the effects of knowledge, attitude, and practice (KAP) regarding sports nutrition and dietary intake among young university athletes. Methods: Twenty-one local university athletes (23.8±3.4 years) were recruited, and their anthropometric and socio-demographic data were assessed. All participants attended a 1-day sports nutrition class. The KAP-Sports nutrition questionnaire was administered. Three days of dietary intake were also recorded at the same timepoints among the participants. Results: There was a significant increment (p<0.05) in the mean scores for KAP among the participants. Total energy and total carbohydrate intakes per day were significantly increased (p<0.05). However, overall protein and fat intakes did not improve as the readings were higher than the recommended values. Conclusion: In this study, sports nutrition education improved participants’ KAP, but not the actual dietary intake. Changes in habit require more effort, with extra attention on protein and fat intakes.

Actualización sobre deficiencias nutricionales en la mujer deportista a partir de la literatura científica / Update on nutritional deficiencies in women athletes from the scientific literature

Los déficits nutricionales en la mujer deportista causan numerosos problemas de salud, así como un empeoramiento en el rendimiento deportivo, como consecuencia de estas deficiencias nutricionales. El conocimiento de estos déficits y su prevención deben ser un aspecto principal para cualquier responsable deportivo. Establecer la importancia del estudio de los déficits de energía, proteínas, minerales (Fe, Ca y Mg) y vitaminas (Vitamina D, ácido fólico y vitamina B12) que pueden desarrollar las mujeres deportistas y su relación con la prevalencia de la tríada femenina y constatar la importancia del conocimiento por parte de los responsables deportivos de los problemas derivados de los déficits nutricionales. Se realizó una búsqueda bibliográfica de artículos, entre 2013-2020, relevantes para el objetivo de estudio. Se usaron bases de datos científicas como PubMed y Pennutrition, siguiendo los criterios de exclusión e inclusión elegidos para este estudio. 51 artículos fueron encontrados. Los resultados mostraron la prevalencia de energía, Fe, vitamina D y Ca, así como un suficiente aporte proteico, faltan estudios para determinar los niveles de vitamina B12 y ácido fólico. Se observó, además la prevalencia de mujeres que cumplen con uno o varios factores de riesgo para el desarrollo de la tríada de la deportistas femenina. Es imprescindible la prevención o, el tratamiento, de los déficits nutricionales en las mujeres deportistas para asegurar un correcto estado de salud y un rendimiento deportivo óptimo(AU)

Nutritional deficiencies in women athletes cause numerous health problems, as well as a worsening of sports performance, as a result of these nutritional deficiencies. Awareness of these deficiencies and their prevention should be a major aspect for any sports manager. The aim of the study was to establish the importance of studying the deficits of energy, protein, minerals (Fe, Ca and Mg) and vitamins (Vitamin D, folic acid and vitamin B12) that can be developed by female athletes and their relationship with the prevalence of the female triad and to establish the importance of knowledge by sports managers of the problems arising from nutritional deficiencies. 51 papers were found. A bibliographic search of relevant articles for the study objective was carried out (2013-2020). Scientific databases such as PubMed and Pennutrition were used, following the exclusion and inclusion criteria chosen for this study. The results showed the prevalence of energy, Fe, vitamin D and Ca, as well as sufficient protein intake and a lack of studies to determine the levels of vitamin B12 and folic acid. In addition, the prevalence of women meeting one or more risk factors for the development of the female sports triad was observed. It is essential the prevention or, treatment, of nutritional deficits in female athletes to ensure proper health status and optimal sports performance(AU)

Effect of a Period of Magnesium Supplementation on Muscle Strength and Resistance of Bodybuilders

Objective:The purpose of this study is to determine the effect of magnesium supplements on the muscular strength of active men.Materials and Methods:Samples were matched into two groups. Magnesium supplements (containing 47 mg of calcium and 250 mg of magnesium oxide produced by al-Hawi Company) were given to the experimental group and the placebo that was completely similar to the supplements for thecontrol group. The tablets are given to every other subject individually and they performed strength training. Supplements were ingested before strength training in the gym and the supplements were consumed with a glass of water. The statistical population of the study included male bodybuilders’ athletes who are regularly excising three days a week in Shahre Kord sports clubs. 40 subjects were selected from people who were interested to participate in the research. After selecting the samples, they are randomly divided into two groups A and B (double-blind method). The strength of the athletes was measured by the CPR machine based on the 1-RM and their resistance by more repetition ofbench press with a standard device using 1-RM by 0.5 Kg in the gym. Results:The results of Wilks' lambda test showed that there is a significant difference between the experimental and control groups in one of the measurements related to arms muscle strength and chest muscle strength, while there is no a significant difference between the two groups in measurements related to muscle strength and resistance of the upper body, which means that magnesium supplementation for 8 weeks has had a significant effect on the strength of the hands and chest muscles of the bodybuilders ‘athlete.Conclusion:Magnesium supplementation can affect the strength of upper body’s muscles of men.

Impact of a nutrition education program on gymnasts perceptions and eating practices

Abstract Aims: To understand how participating in a Nutrition & Health Education program (NHEP) affected the way rhythm gymnasts and their coaches perceive their food practices. Methods: Qualitative study portraying a case study of a NHEP specifically designed for a rhythm gymnastic team. The NHEP was conducted at the training facilities. Fourteen rhythm gymnasts, consisting of the team that represents a city in the state of São Paulo, Brazil, and their two coaches participated in the study. Athletes and coaches were interviewed about their perceptions and food practices before and after a 9-month NHEP designed specifically for them. Recorded interviews were transcribed verbatim. Two categories emerged from the discourses and were analyzed using the content analysis: "beliefs and feeding practices" and "construction of a positive relationship with food". Results: Athletes reported changes in their food practices related to the themes discussed with them in the NHEP, such as daily breakfast intake, higher intake of fruits, vegetables, milk products, and wholegrain foods. Conclusion: The NHEP allowed specific demands of the athletes to be identified and addressed, generating awareness and motivation to positive changes in eating practices.

Construcción del perfil profesional del nutricionista deportivo / Professional Profile Construction of the Sports Nutritionist

Las directrices más recientes de la Organización Mundial de la Salud (OMS) han actualizado las recomendaciones anteriores, publicadas en 2010, las cuales reafirman la importancia de practicar actividad física que incluya ejercicios aeróbicos y musculares de forma regular. Los beneficios para la salud se acumulan al hacer cualquier cantidad de actividad y se evidencian en personas de todas las edades y habilidades. Las investigaciones muestran que estos beneficios se extienden más allá del sector de la salud con impacto a nivel social, económico y ambiental. Ante este panorama, surgen una amplia gama de posibilidades para el ejercicio de la profesión del nutricionista dietista, especialmente en el área de la nutrición deportiva, la cual se encarga de la aplicación de principios nutricionales con el fin de mejorar el entrenamiento, la recuperación y el rendimiento deportivo no solo de los atletas de élite, sino también de la población físicamente activa. La nutrición deportiva es un campo de rápido crecimiento en muchos países del mundo, sin embargo, en algunos países de Latinoamérica hasta el momento de esta revisión, no se identificaron estándares de práctica para los profesionales en nutrición y dietética que deseen convertirse en nutricionistas deportivos. Por tanto, el propósito de este artículo es describir el rol del nutricionista deportivo en la promoción de la salud y el bienestar para la población general, destacando las competencias del profesional, y brindar información sobre los pasos a seguir para construir una carrera sólida(AU)

The most recent guidelines from the World Health Organization (WHO) have updated previous recommendations, published in 2010, which reaffirm the importance of practicing a physical activity that includes aerobic and muscular exercises regularly. The health benefits accrue from doing any amount of activity and are evident in people of all ages and abilities. Research shows that these benefits extend beyond the health sector with social, economic and environmental impact. Against this background, a wide range of possibilities arise for the exercise of the profession of dietician nutritionist, especially in the area of sports nutrition, which is responsible for the application of nutritional principles in order to improve training, recovery and sports performance not only of elite athletes but also of the physically active population. Sports nutrition is a rapidly growing field in many countries worldwide; however, in some Latin American countries at the time of this review, no practice standards have been identified for nutrition and dietetic professionals wishing to become sports nutritionists. Therefore, the purpose of this article is to describe the role of the sports nutritionist in promoting health and well-being for the general population, highlighting the competencies of the professional, and provide information on the steps to follow to build a solid career(AU)

Association between various levels of training-related energy expenditure and dietary and nutrient intake in Japanese male collegiate rugby players / 体力科学

This study aimed to explore the association between various levels of training-energy expenditure (TrEE) and nutritional response during the phases of periodization among male collegiate rugby players. Seventeen Japanese male collegiate rugby players were enrolled in the study. Their TrEE and dietary intake were assessed each day during three separate microcycle training phases in the preparatory phase of periodization (P1 and P2: general training phase consisting of two sessions per day over the term during which the school held classes and during a summer vacation, respectively; and P3: intensive training phase consisting of four sessions per day during a summer vacation) using the factorial method and dietary records, respectively. The TrEE for P3 (1644±273 kcal) was significantly higher than that for P1 (891±230 kcal). However, the total energy intake (EI) for P3 (3274±889 kcal) was significantly lower than that for P1 (3978±938 kcal). The daytime (after waking in the morning and before the evening training session) EI (242±159 kcal) and protein intake (19±12 g) from the ‘high-protein foods group’ during P3 was significantly reduced compared with that during P1 (465±252 kcal, 37±15 g), whereas, EI and carbohydrate intake from the ‘supplements group’ of P3 was significantly increased compared with P1. The increased TrEE during P3 was not compensated by EI; instead, there was a decreased nutrient intake from the high-protein foods group and increased intake from the supplements group. The time of day of multiple or intensive training sessions, i.e. different TrEE, might affect the food choices made by male rugby players.

Composição corporal e consumo alimentar de jogadores de rúgbi / Body composition and food consumption of rugby players

O objetivo foi avaliar a composição corporal e ingestão alimentar em jogadores de rúgbi. Quatorze jogadores de rúgbi brasileiros foram submetidos a medidas antropométricas (massa corporal e estatura), dobras cutâneas para cálculo do percentual de gordura e massa livre de gordura, e registro alimentar de três dias. Os valores nutricionais obtidos foram comparados às recomendações internacionais. Os jogadores apresentaram consumo inadequado para água, carboidratos, magnésio, selênio, tiamina, riboflavina, piridoxina (100%), manganês, vitamina A, ácido fólico (92,8%), zinco, niacina (78,6%), lipídios, vitamina C (71,4%), cálcio, vitamina E (64,3%), ácido pantatênico (57,1%), e fósforo (50%), sinalizando para necessidade de aconselhamento profissional...(AU)

The aim of this study was to assess body composition and dietary intake in amateur rugby players. Fourteen brazilian rugby players underwent to anthropometric measurements (body mass and height), skinfold thickness to calculate the percentage of body fat and fat free mass, and a 3-day food record. The nutritional values obtained were compared to international recommendations. The participants do not meet the recommendations for water, carbohydrates, magnesium, selenium, thiamine, riboflavin, pyridoxine (100%), manganese, vitamin A, folic acid (92,8%), zinc, niacin (78,6%), lipids, vitamin C (71,4%), calcium, vitamin E (64,3%), pantothenic acid (57,1%) and phosphorus (50%), suggesting the need for professional counseling...(AU)

Dietary intake in high-level swimmers. A 32-week prospective cohort study

AIMS: To determine whether high-level swimmers present adequate energy and macronutrient intake during each training phase of the season. METHODS: A 32-week prospective cohort study was conducted with 18 elite swimmers (10 men, 20±2 years; 8 women, 20±3 years) from a competitive swimming club. This period comprised two training macrocycles, each one divided in four training phases: general, mixed, specific and competition. Dietary intake, estimated energy expenditure and daily energy requirements were assessed in every training phase. Body composition was evaluated five times throughout the season. Energy and macronutrient consumption were compared with the energy expenditure and the literature recommendations, respectively. RESULTS: Athletes maintained a relatively constant dietary intake throughout the season, regardless the different needs of each training phase. The balance between energy consumption and expenditure was negative in all training phases (p=0.02; d between 1.5-6.2) for women, while men did so in half of phases (p<0.01; d between 0.3-4.1). Swimmers had higher protein intake than recommendations in 73% of the evaluations, while carbohydrate and lipids intake were lower than recommendations in 76% and 69% of the evaluations, respectively. CONCLUSION: Athletes did not meet the energy demands and specific macronutrient requirements of each training phase of the competitive season.(AU)

Effects of carbohydrate restriction on exercise performance / 体力科学

<p>Carbohydrate is a crucial energy fuel for exercise, and carbohydrate supplementation as peri-exercise has beneficial effects on exercise performance. However, recent studies have indicated the possibility that periodized carbohydrate restriction improves exercise performance. Carbohydrate restriction before exercise increases fatty-acid oxidation (FAO) and alternatively prevents carbohydrate consumption during exercise. This may contribute to the prevention of muscle glycogen depletion during endurance exercise competition. Additionally, acute and chronic studies have shown that peri-exercise carbohydrate restriction enhances molecular and functional adaptation related to FAO. Similarly, exercise training in a low-muscle glycogen state accompanied by carbohydrate restriction was reported to enhance mitochondrial biogenesis and improve FAO capacity, aerobic capacity, and endurance performance in untrained and highly trained subjects. The potential mechanism of these metabolic adaptations may be related to elevated circulating fatty-acid and adrenaline concentration during exercise with carbohydrate restriction and/or a low-muscle glycogen state. In addition, a decrease in muscle glycogen content may trigger signaling pathways related to FAO and mitochondria biogenesis by activating proteins with a glycogen-binding domain. This article reviews the effects of exercise with carbohydrate restriction and/or low-muscle glycogen state on metabolic adaptation and exercise performance and describes the molecular mechanisms and availability.</p>

O papel da suplementação de betaína na atividade física: uma revisão sistemática / The role of betaine supplementation in physical activity: a systematic review

OBJECTIVE: This study aims to evaluate the betaine supplementation and its possible ergogenic potential in physically active adults. Data source: In the present review, articles were searched using indexed databases (SciELO and NCBI) and the following keywords were selected for the search: "supplement", "betaine", "performance" and "adults", including terms of lexical proximity, limited to articles in English, published between 2000 and the present date. Inclusion criteria: adults, physically active individuals or individuals under physical test and betaine supplementation. Data synthesis: According to the applied search criteria, 20,750 articles were found, from which only seven obeyed to inclusion parameters after judicious reading of the texts. In these, betaine supplementation was capable to increase anaerobic potency, muscular and isometric endurance, and stimulate an anabolic environment. In contrast, no increase was observed in the plasmatic levels of nitrate/nitrite and, when compared to creatine, betaine supplementation was not able to raise the levels of phosphorylcreatine or strength in sedentary individuals. CONCLUSIONS: The present work showed that betaine supplementation plays an important role as an ergogenic resource, mainly in biomarkers and muscular strength and power; nevertheless, it is apparently ineffective when given to sedentary individuals

OBJETIVO: Este estudo teve como objetivo avaliar a suplementação de betaína e seu possível potencial ergogênico em adultos fisicamente ativos. Fonte de dados: Na presente revisão, artigos foram pesquisados usando bancos de dados indexados (e.g., SciELO e NCBI) e as seguintes palavras-chave foram selecionados para a procura: "suplemento", "betaína", "desempenho" e "adultos", incluindo termos de proximidade léxica, limitado-se a artigos em inglês e português publicados entre 2000 e a presente data. Critérios de inclusão: referirem-se a adultos, indivíduos fisicamente ativos ou sob teste físico e suplementação de betaína. Síntese dos dados: De acordo com os critérios de pesquisa aplicada, 20.750 artigos foram encontrados, dos quais apenas sete obedeceram aos parâmetros de inclusão após leitura criteriosa do texto. Nesses estudos, a suplementação de betaína foi capaz de elevar potência anaeróbica, resistência muscular e isométrica e estimular um ambiente anabólico. Em contraste, não foram encontradas elevações nos níveis plasmáticos de nitrato/nitrito e, quando comparada à suplementação de creatina, não foi capaz de elevar níveis de fosforilcreatina ou força em indivíduos sedentários. CONCLUSÕES: O presente trabalho mostrou que a suplementação de betaína desempenha um papel importante como ergogênico, principalmente em níveis de marcadores biológicos e sobre força e potência muscular, embora aparentemente seja inefetiva quando fornecida a indivíduos sedentários

Nutrición para el entrenamiento y la competición / Nutrition for training and competition

La nutrición es un factor relevante en el rendimiento deportivo. El objetivo de la nutrición deportiva es aportar la cantidad de energía apropiada, otorgar nutrientes para la mantención y reparación de los tejidos y, mantener y regular el metabolismo corporal. Entre los macronutrientes más relevantes para el deportista están los Hidratos de Carbono, cuyo aporte se ajusta de acuerdo al entrenamiento, semana previa a la competencia, día de la competición y recuperación. Otro aspecto central, es asegurar una hidratación adecuada, para lo cual es fundamental implementar planes adaptados a los requerimientos individuales como parte del programa de entrenamiento. Finalmente, es importante considerar el uso de suplementos en los deportistas basados en la evidencia de la medicina actual, de manera de obtener beneficios a partir de ellos, evitar riesgo de salud y de dopaje.

Nutrition is an important factor in sports performance. The goal of sports nutrition is to provide the proper amount of energy, nutrients for maintenance and repair of tissues and, preserve and regulate body metabolism. Among the most important macronutrient for the athlete are carbohydrate, whose intake is adjusted according to the training a week before the competition, the day of the competition, and the recovery after it. Another focus is to ensure an adequate hydration, which is essential for implementing specifics plans to individual requirements as part of the training program. Finally, it is important to consider the use of supplements in athletes based on current medical evidence, to obtain benefits from them, and to avoid health risks and doping.

The Effects of Comprehensive Geriatric Training on Physical Performance, Dietary Intake, and Blood Composition for Local Elderly People −A Case in The Southern Nagano Region of Japan− / 体力科学

The purpose of the present study was to observe the parameter which contributed to the improvement in a physical function to resistance training for local living elderly people. Randomly-selected 24 local elderly people of 69.4±3.8 years of age went through a three month exercise program of Comprehensive Geriatric Training, which is one of the resistance training programs focused on care prevention. During intervention, physical function, blood composition and dietary survey were researched simultaneously. Any dietary changes were not observed among the 24 seniors after three months of training. Compared to the control group, however, their maximum walking speed increased, which is strongly correlating to their increase in BMI and body weight. Their sit and reach performance increased as well, which is negatively correlating to their serum triglyceride increase. Their blood albumin did not change before and after the training period. In conclusion, measuring BMI, body weight and serum triglyceride during the resistance training period may lead to positive results of the main outcomes in local living elderly men and women.

Perfil nutricional de praticantes de corrida de rua de um clube esportivo da cidade de Belo Horizonte, MG, Brasil / Nutritional profile of streets runners from a sports club in the city of Belo Horizonte, MG, Brazil

O perfil antropométrico e/ou dietético de corredores de elite tem sido estudado; porém, pouco se conhece sobre estas características em praticantes de corrida de rua "recreacionais". O objetivo deste estudo foi caracterizar o perfil nutricional de praticantes de corrida de rua de um clube esportivo de Belo Horizonte (BH)/MG, encaminhados ao ambulatório de nutrição da clínica-escola de uma faculdade privada da cidade. A amostra foi composta por 19 indivíduos, na faixa etária entre 28 e 53 anos. Para o diagnóstico do estado nutricional foi obtida análise da adequação da ingestão de energia e dos macronutrientes - carboidratos (CHO), lipídios (LIP) e proteínas (PTN) - por meio do método recordatório de 24 horas (R24h), além da caracterização do perfil antropométrico. Os resultados da avaliação dietética indicaram que, segundo as recomendações propostas pelas DRIs (ingestão dietética de referência), a distribuição energética entre os macronutrientes em ambos os sexos encontra-se adequada sendo de 48,1 ± 9,2 por cento (CHO); 29,6 ± 7,2 por cento (LIP); e 22,3 ± 4,96 por cento (PTN). Entretanto, quando se considera o consumo em g/kg de peso corporal, a ingestão de CHO apresentou-se baixa (3,54 ± 1,45g/kg/d) e a de PTN alta (1,7 ± 0,57g/kg/d) para esta modalidade esportiva. Quanto ao consumo energético total, 89,5 por cento dos corredores estavam com ingestão energética abaixo dos valores recomendados, resultando em deficiência calórica diária. Em relação às características antropométricas, o percentual de gordura corporal ( por centoGC) médio entre homens e mulheres não apresentou diferença estatística e mostrou-se adequado segundo a faixa etária. A circunferência da cintura (CC) e razão cintura quadril (RCQ) do grupo indicaram valores normais, não representando risco aumentado para doenças cardiovasculares. Concluímos que há indicativos que, apesar de os desportistas avaliados terem realizado distribuição energética em por cento adequada...

The anthropometric and/or dietary profile of elite runners has been studied; however, little is known about the characteristics of recreational street runners. This study was aimed to characterize the nutritional profile of recreational runners from a sports club in Belo Horizonte, MG, Brazil, who were referred to a nutritional clinic of a local private college. The sample study was composed of 19 athletes, aged between 28 and 53 years. The diagnosis of the runners' nutritional status was obtained by assessment of their energy intake and macronutrients - carbohydrates (CHO), lipids (LIP), and proteins (PTN) - through the 24-hour dietary recall (R24h), as well as analysis of their anthropometric profile. The results obtained from the dietary evaluation showed that according to the recommendations proposed by the DRIs (Dietary Reference Intakes), the distribution of energy among the macronutrients in both men and women was adequate: 48.1±9.2 percent (CHO), 29.6±7.2 percent (LIP) and 22.3±4.96 percent (PTN). However, when considering energy consumption in g/kg of body weight, the intake of CHO was low (3.54±1.45g/kg/d) and of PTN was high (1.7±0.57 g/kg/d) for this type of recreational exercise. Regarding total energy consumption, 89.5 percent of runners presented energy intake below the recommended values, resulting in daily caloric deficiency. Concerning the anthropometric evaluation, the average percentage of body fat ( percentG) for men and women was not statistically different and was considered adequate based on their age. Waist circumference (WC) and waist/hip ratio (WHR) of the studied group showed normal results and do not represent increased risk for cardiovascular diseases. In conclusion, the study indicates that although the athletes showed adequate caloric distribution of macronutrients, it was still not sufficient to meet the energy requirements of their modality, suggesting hence that continuous nutritional guidance is needed.

Nutrition requirements in child and adolescent athletes / 소아과

Increasing numbers of children and adolescents prefer undertaking physical exercise to overcome overweight or obesity. Children and adolescents are in the growth stage and require adequate nutrient supply. More calories and nutrients are required especially when they are engaged in physical exercise. Exercise is the only means to increase lean body mass and decrease body fat, but adequate nutrient supply is also essential. Lack of adequate nutrient supply causes muscle mass loss, menstruation irregularity, reduced bone density, fatigue, or frequent injury in children undertaking physical exercise. Here, I have introduced some guidelines on the nutrient requirement for child and adolescent athletes.

Consumo de suplementos por jovens freqüentadores de academias de ginástica em São Paulo / Supplement use amongst young individuals in São Paulo's fitness centers

A preocupação com a aparência e a estética pode levar ao consumo indiscriminado de suplementos nas academias. Os fatores relacionados ao consumo de suplementos em 201 jovens entre 15 e 25 anos freqüentadores de academias de ginástica da cidade de São Paulo foram investigados através da aplicação de formulário próprio. O uso de suplementos é relatado por 61,2 por cento (n = 123) da amostra. Os homens usam mais suplementos que as mulheres (p < 0,001) e os adolescentes tendem a utilizar mais que os adultos jovens (p = 0,07). Os suplementos mais utilizados são bebidas esportiva (12 por cento), hipercalóricos (12 por cento), aminoácidos (10 por cento), proteínas (10 por cento) e creatina (8 por cento), basicamente por auto-prescrição (42,8 por cento) e pela indicação de treinadores (27,5 por cento). O consumo de suplementos é significativamente maior entre aqueles que se exercitam há mais tempo; freqüentam a academia há mais tempo; e ficam na academia mais horas/semana. Ter amigos usuários (p = 0,03) e/ou um usuário em casa (p = 0,01) influencia no consumo de suplementos. O consumo de suplementos é uma prática que faz parte da realidade das academias de ginástica e o ambiente é favorecedor do uso desses produtos.

The concern with physical appearance and aesthetics in fitness centers can lead to an indiscriminate use of supplements. A questionnaire was used to investigate factors relating to supplement use among 201 young users of fitness centers in the city of São Paulo, Brazil. Supplement use was reported by 61.2 percent (n = 23) of the sample. Men use more supplements than women (p < 0.001) and adolescents tend to use them more than young adults (p = 0.07). The supplements most used by this group are sports drinks (12 percent); high-calorie "gainers" (12 percent), amino acids (10 percent), proteins (10 percent) and creatine (8 percent). The supplements are taken trough own initiative (42.8 percent) and trainers' recommendation (27.5 percent). Those who have been exercising for a longer time, go more often to the fitness centers, and devote more time to exercise/week are significantly more involved in supplement use. The presence of user friends (p = 0.03) and/or a user at home (p = 0.01) also influences on the use of supplements. Supplement use is a widespread, common practice at fitness centers, whose environment favors their use.

Sports Nutrition / 全日本鍼灸学会雑誌

In order to consider sports nutrition, the position of dietitians and nutritionists needs to be recognized first among people involved in sports. The author, therefore, introduced the roles of nutritionists.<BR><BR>What is the most required nutrition for athletes?The author thinks it is carbohydrates, not proteins. The least required is fat. If that is the case, the percentage composition of total energy intake from traditional Japanese meals seems to be very close to the most ideal diet for athletes. Fluid intake is significant to prevent hyperthermia. In order to estimate the amount of sweat, body mass before and after training as well as the amount of water intake needs to be measured. Fluid intake is considered based on these values. <BR>In addition, instructors should pay special attention to other problems especially with female athletes. Next, the author introduces a diet intervention that we provided for female lacrosse players at our university. Based on this research, it was proven that short-term diet intervention can produce effects on the athletes'body composition, tenacity and the feeling of fatigue.

Suplementação de creatina e treinamento de força: alterações na resultante de força máxima dinâmica e variáveis antropométricas em universitários submetidos a oito semanas de treinamento de força (hipertrofia) / Creatine supplementation and strength training: alterations in the resultant of dynamic maximum strength and anthropometric variables in college students submitted to 8 weeks of strength training (hypertrophy)

OBJETIVO: Verificar as alterações promovidas pela suplementação de creatina nas variáveis antropométricas e da resultante de força máxima dinâmica (RFMD) em universitários submetidos a oito semanas de treinamento de força. METODOLOGIA: Participaram deste estudo, 18 universitários do sexo masculino, com idade entre 19 e 25 anos. Antes do treinamento foram determinadas a estatura (cm), a massa corporal (kg) e testes de ação muscular voluntária máxima dinâmica (1AMVMD), os sujeitos foram assinalados a um dos dois grupos, A (creatina) e B (placebo), foi adotado o protocolo duplo-cego. Após oito semanas de treinamento de força, repetiu-se a bateria de testes do pré-treinamento. RESULTADOS: Após oito semanas, verificou-se que tanto no grupo A como no B houve alterações estatisticamente significantes (ES) na RFMD em todos os exercícios (p = 0,007 a 0,008). A análise da melhora percentual e do delta da RFMD, nos exercícios de agachamento, desenvolvimento e supino fechado, mostrou que o grupo A teve alterações positivas ES superiores ao grupo B (p = 0,008 a 0,038). A massa magra aumentou ES somente no grupo A (p = 0,038). Contudo, o percentual de gordura corporal não mostrou alterações em nenhum dos grupos. A relação entre a melhora percentual (MP) das circunferências (C) do braço e antebraço e a MP na RFMD do exercício de desenvolvimento foi ES (r = 0,481 e 0,546, respectivamente), bem como entre a MP na C da coxa e na MP da RFMD do exercício de agachamento (r = 0,619). CONCLUSÃO: Independente do suplemento ingerido o treinamento de força foi capaz de induzir ajustes positivos na RFMD; contudo, a suplementação de creatina mostrou-se mais eficiente que o placebo, induzindo a maior aumento percentual e de delta na força.

OBJECTIVE: To verify the alterations promoted by creatine supplementation in the anthropometric variables and the resultant of dynamic maximum strength (RDMS) in college students submitted to 8 wk of strength training. METHODOLOGY: The sample consisted of 18 male college students, aged between 19 to 25 years. Height (cm), body mass (kg) and tests of maximum voluntary muscular action (1MVMA) weight in the squat were determined prior to the training. The subjects were divided in two groups: A (creatine) or B (placebo).The double-blind protocol was adopted. After 8 weeks of strength training, the tests battery from the pre-training was repeated. RESULTS: After 8 wk of training, it was verified that both groups had statistically significant (SS) alterations in the RDMS in all the exercises (p = 0.007 / 0.008). The analysis of the percentile improvement (PI) and the RDMS delta in the squat exercises, military press and close-grip-extensions, showed that group A had positive SS alterations higher than group B (p = 0.008 / 0.038). Lean body mass only SS increased in group A (p = 0.038). However, the percentage of body fat did not show alterations in none of the groups. The relationship between the PI of the arm and forearm circumferences (C) and the PI in the RDMS of the development exercise was SS (r = 0.481 and 0.546, respectively), as well as between the PI in the thigh C and the PI of the RDMS of the squat exercise (r = 0.619). CONCLUSION: Regardless the substance ingested, strength training was able to increase in RDMS; however, creatine supplementation was shown to be more efficient that the placebo, showing higher percentual and delta improvement in strength.