Temporal benefits of endurance running on self-control in sedentary university students / 中国学校卫生

Objective@#To investigate the effects of endurance running at different intensities on self-control of sedentary university students, and to reveal the immediate and sustained effects of exercise on cognitive control.@*Methods@#Ninety students with sedentary behaviors from 7 universities in a university city in Shandong Province were selected by cluster stratified random sampling. 21, 23, 21 and 25 students in the high, medium and low intensity groups and the blank control group completed the 30min endurance running exercise, combined with the willingness of the subjects. The Stroop test was conducted immediately after exercise, 5, 15 and 30 min after exercise, and the correct rate and response time of the Stroop test were used as two indicators of self-control.@*Results@#In the immediate post-exercise period, the correct response time for the control group ( 774.03 ±127.85)ms], the high-intensity group [(745.37±109.59)ms], the moderate-intensity group [(627.90±129.18)ms] and the low-intensity group [(689.90±129.79)ms] were statistically significant ( F =6.27, P <0.05). The correct rate for the control group [(94.40±2.02)%], the low-intensity group [(95.38±1.96)%], the high-intensity group [(92.43±2.32)%] and the moderate-intensity group [(96.39±1.08)%] were statistically significant ( F =14.87, P <0.05). High-intensity endurance running exercise was able to achieve the best performance at 30 min and beyond on the Stroop test response and correctness ( P <0.05), while moderate-intensity endurance running had a better effect on improving self-control than low-intensity endurance running at 30 min post-exercise.@*Conclusion@#High and moderate-intensity endurance running exercises can effectively improve self-control in sedentary university students. It is recommended that moderate or high intensity endurance running be performed as the body can tolerate it to improve self-control and cognitive ability.

Does running reduce the frequency and intensity of migraine attacks? A systematic review with meta-analysis / Correr reduz a frequência e a intensidade das crises de enxaqueca? Uma revisão sistemática com meta-análise

Introduction:Migraine is a complex headache to treat, often with an unsatisfactory clinical response. Aerobic exercise, such as running, can be a non-pharmacological treatment to reduce migraine attacks. Objective:This systematic review with meta-analysis investigated the effects of running on frequency and intensity of pain in subjects with migraine compared with other or no aerobic exercise. Methods:Randomized and quasi-randomized clinical trials were searched between September and November 2021 in BVS, PubMed, Cochrane, CINAHL, SCOPUS, Embase, and Web of Science databases. The Cochrane Risk of Bias tool assessed methodological quality, and the recommendation ranking assessed the certainty of evidence. The frequency of migraine attacks was pooled in a meta-analysis (random effects) that included interval and continuous running subgroups. Results:Only two of the 483 studies analyzed were included in the review (52 individuals, 81% females). Migraine intensity was not included in the meta-analysis because only one study measured this outcome. None of the studies demonstrated that running reduced the frequency of migraine attacks (MD = -0.40 [95% CI = -1.61 to 0.81]). The studies included presented a high risk of bias and very low certainty of evidence. Conclusion:The results were not sufficient to recommend running as a treatment to reduce the frequency and intensity of migraine attacks.

Introdução: A enxaqueca é uma cefaleia complexa de tratar, muitas vezes com resposta clínica insatisfatória. O exercício aeróbico, como a corrida, pode ser um tratamento não farmacológico para reduzir as crises de enxaqueca. Objetivo: Esta revisão sistemática com meta-análise investigou os efeitos da corrida na frequência e intensidade da dor em indivíduos com enxaqueca em comparação com outros ou nenhum exercício aeróbico. Métodos:Ensaios clínicos randomizados e quase randomizados foram pesquisados ​​entre setembro e novembro de 2021 nas bases de dados BVS, PubMed, Cochrane, CINAHL, SCOPUS, Embase e Web of Science. A ferramenta Cochrane Risk of Bias avaliou a qualidade metodológica e a classificação das recomendações avaliou a certeza das evidências. A frequência das crises de enxaqueca foi agrupada em uma meta-análise (efeitos aleatórios) que incluiu subgrupos de intervalo e de execução contínua. Resultados: Apenas dois dos 483 estudos analisados ​​foram incluídos na revisão (52 indivíduos, 81% do sexo feminino). A intensidade da enxaqueca não foi incluída na metanálise porque apenas um estudo mediu esse resultado. Nenhum dos estudos demonstrou que correr reduziu a frequência de crises de enxaqueca (MD = -0,40 [IC 95% = -1,61 a 0,81]). Os estudos incluídos apresentaram alto risco de viés e baixíssima qualidade de evidência. Conclusão:Os resultados não foram suficientes para recomendar a corrida como tratamento para reduzir a frequência e intensidade das crises de enxaqueca.

Restorative effect of jogging on lower limb muscles / Efeito reparador da corrida moderada sobre a musculatura dos membros inferiores / Efecto restaurador del trote moderado sobre los músculos de los miembros inferiores

ABSTRACT Introduction: Jogging can be a great way to improve physical condition, boosting mind and body. Its method of movement is simple, and there are no sporting limitations as to age, gender, or training place. Jogging is believed to help repair muscle and joint injuries in the lower limbs. Objective: To explore the effects of running on recovering lower limb muscles. Methods: We surveyed 60 undergraduate students who took a 400-meter test at the same site. According to the test results, they were divided into low, medium, and high fitness levels. A questionnaire survey was also used with 20 undergraduate students from the Physical Education Department. Four groups of volunteers did some jogging exercises. Physiological, biochemical, and muscle strength measurements were performed after jogging. The data were statistically treated. Results: The magnitude of change in the sagittal angle of the knee and ankle joint did not increase significantly with increasing jogging rate. The changes in the sagittal angles of the hip, knee, and ankle joints were the same for the volunteers with different jogging rates. After 60 minutes of exercise, the low-fitness group showed faster breathing, an elevated heart rate, and a higher rate of lactate and creatinine in the blood. After 120 minutes of exercise training, all sedentary volunteers showed an increase in lactate, creatinine, respiratory rate, and heart rate (P<0.05). The test performance started to decrease at 400 meters. Conclusion: The maximal activation of different parts of the locomotor system changed under different rates of movement. Brief, controlled jogging may be beneficial to lower limb muscles. Still, long-term jogging may cause even more damage to the body and deleterious changes to rehabilitation in blood and biochemical parameters. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

RESUMO Introdução: A corrida moderada pode ser uma ótima maneira de melhorar a condição física, impulsionando mente e corpo. Seu método de movimento é simples e não há limitações esportivas quanto a idade, sexo ou local de treino. Acredita-se que a corrida moderada possa auxiliar no reparo de lesões musculares e articulares nos membros inferiores. Objetivo: Explorar os efeitos da corrida sobre a musculatura nos membros inferiores em recuperação. Métodos: Foram pesquisados 60 estudantes de graduação que fizeram um teste de 400 metros no mesmo local. De acordo com os resultados do teste, eles foram divididos em baixo, médio e alto nível de aptidão física. Também se utilizou uma pesquisa por questionário com 20 estudantes universitários do Departamento de Educação Física. Quatro grupos de voluntários fizeram alguns exercícios de corrida moderada. As medidas fisiológicas, bioquímicas e de força muscular foram realizadas após a corrida moderada. Os dados foram tratados estatisticamente. Resultados: A magnitude da mudança no ângulo sagital da articulação do joelho e tornozelo não aumentou significativamente com o aumento da taxa de corrida moderada. As mudanças nos ângulos sagitais das articulações do quadril, joelho e tornozelo foram as mesmas para os voluntários com diferentes taxas de corrida moderada. Após 60 minutos de exercício, o grupo de baixa condição física apresentou uma respiração mais rápida, um ritmo cardíaco elevado e uma taxa maior de lactato e creatinina no sangue. Após 120 minutos de treinamento físico, todos os voluntários sedentários apresentaram um aumento de lactato, creatinina, frequência respiratória e cardíaca (P<0,05). O desempenho do teste começou a diminuir aos 400 metros. Conclusão: A ativação máxima de diferentes partes do sistema locomotor alterou-se sob diferentes taxas de movimento. A corrida moderada breve e controlada pode ser benéfica a musculatura dos membros inferiores, porém a corrida moderada de longo prazo pode causar ainda mais danos ao corpo e mudanças deletérias à reabilitação nos parâmetros sanguíneos e bioquímicos. Nível de evidência II; Estudos terapêuticos - investigação dos resultados do tratamento.

RESUMEN Introducción: El trote moderado puede ser una gran manera de mejorar la condición física, impulsando la mente y el cuerpo. Su método de movimiento es sencillo y no existen limitaciones deportivas en cuanto a edad, sexo o lugar de entrenamiento. Se cree que trotar puede ayudar a reparar las lesiones musculares y articulares de las extremidades inferiores. Objetivo: Explorar los efectos de la carrera en la recuperación de los músculos de las extremidades inferiores. Métodos: Se encuestó a 60 estudiantes universitarios que realizaron una prueba de 400 metros en el mismo lugar. Según los resultados de la prueba, se dividieron en nivel de aptitud bajo, medio y alto. También se utilizó una encuesta con 20 estudiantes de grado del Departamento de Educación Física. Cuatro grupos de voluntarios realizaron ejercicios de trote. Se realizaron mediciones fisiológicas, bioquímicas y de fuerza muscular después del trote moderado. Los datos fueron tratados estadísticamente. Resultados: La magnitud del cambio en el ángulo sagital de la articulación de la rodilla y el tobillo no aumentó significativamente con el aumento de la velocidad del trote. Los cambios en los ángulos sagitales de las articulaciones de la cadera, la rodilla y el tobillo fueron los mismos para los voluntarios con diferentes ritmos de trote. Después de 60 minutos de ejercicio, el grupo de baja forma física mostró una respiración más rápida, una frecuencia cardíaca elevada y un mayor índice de lactato y creatinina en la sangre. Tras 120 minutos de entrenamiento físico, todos los voluntarios sedentarios mostraron un aumento del lactato, la creatinina, la frecuencia respiratoria y la frecuencia cardíaca (P<0,05). El rendimiento de la prueba comenzó a disminuir a partir de los 400 metros. Conclusión: La activación máxima de diferentes partes del aparato locomotor cambió bajo diferentes ritmos de movimiento. El trote moderado y de forma controlada puede ser beneficioso para los músculos de las extremidades inferiores, pero trotar a largo plazo puede causar aún más daño al cuerpo y cambios nocivos para la rehabilitación en los parámetros sanguíneos y bioquímicos. Nivel de evidencia II; Estudios terapéuticos - investigación de los resultados del tratamiento.

Analysis of jogging on muscle fatigue and body balance / Análise da corrida moderada sobre a fadiga muscular e o equilíbrio corporal / Análisis del trote sobre la fatiga muscular y el equilibrio corporal

ABSTRACT Introduction: The changes in muscle condition during jogging are studied according to their characteristics to formulate a correct fitness plan. With a medium effort intensity, studies on jogging have shown positive effects on mental de-stress and motor coordination. Objective: Study the effect of running training on muscle fatigue and body balance. Methods: A total of 60 sedentary freshmen from a university were selected, including 30 male and 30 female students. The volunteers were randomly divided into experimental and control groups. While the control performed routine sports activities according to the teaching plan during physical education class, the students in the experimental group performed a jogging training protocol. Data were collected before and after the intervention for comparison and statistical analysis. Results: The vestibular step test changed from 20.56 to 13.87, evidencing that jogging training significantly improved body balance ability in addition to providing body flexibility. Conclusion: Combined with curriculum standards and the level of physical training required, jogging can be integrated into physical education classes to promote student health. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

RESUMO Introdução: As alterações da condição muscular na corrida moderada são estudadas segundo suas características próprias no intuito de formular um plano de aptidão física correta. Com uma intensidade de esforço média, estudos sobre a corrida vem demonstrando efeitos positivos sobre o desestresse mental e a coordenação motora. Objetivo: Estudar o efeito do treino de corrida moderada sobre a fadiga muscular e o equilíbrio corporal. Métodos: Um total de 60 calouros sedentários de uma universidade foram selecionados, incluindo 30 estudantes do sexo masculino e 30 do sexo feminino. Os voluntários foram divididos aleatoriamente em grupo experimental e grupo de controle. Enquanto o controle realizou atividades esportivas rotineiras, de acordo com o plano de ensino durante a aula de educação física, os alunos do grupo experimental realizaram um protocolo de treinamento de corrida. Os dados foram coletados antes e após a intervenção para comparação e análise estatística. Resultados: O teste de passo vestibular alterou-se de 20,56 para 13,87, evidenciando que o treinamento em corrida melhorou significativamente a capacidade de equilíbrio corporal além de propiciar a flexibilidade corporal. Conclusão: Combinado às normas curriculares e ao nível de aptidão física exigida dos estudantes, o treinamento em corrida moderada pode ser integrado às aulas de educação física para fomentar a saúde dos estudantes. Nível de evidência II; Estudos terapêuticos - investigação dos resultados do tratamento.

RESUMEN Introducción: Los cambios en el estado muscular durante el trote se estudian en función de sus características propias con el fin de formular un correcto plan de acondicionamiento físico. Con una intensidad de esfuerzo media, los estudios sobre el trote han demostrado efectos positivos sobre el desestresamiento mental y la coordinación motora. Objetivo: Estudiar el efecto del entrenamiento de carrera sobre la fatiga muscular y el equilibrio corporal. Métodos: Se seleccionó a un total de 60 estudiantes sedentarios de primer año de una universidad, de los cuales 30 eran hombres y 30 mujeres. Los voluntarios se dividieron aleatoriamente en grupo experimental y grupo de control. Mientras que el grupo de control realizó actividades deportivas rutinarias según el plan de enseñanza durante la clase de educación física, los estudiantes del grupo experimental llevaron a cabo un protocolo de entrenamiento de trote. Se recogieron datos antes y después de la intervención para su comparación y análisis estadístico. Resultados: La prueba de paso vestibular cambió de 20,56 a 13,87, lo que evidencia que el entrenamiento de trote mejoró significativamente la capacidad de equilibrio corporal además de proporcionar flexibilidad corporal. Conclusión: Combinado con las normas curriculares y el nivel de condición física exigido a los alumnos, el entrenamiento de trote puede integrarse en las clases de educación física para promover la salud de los estudiantes. Nivel de evidencia II; Estudios terapéuticos - investigación de los resultados del tratamiento.

Effects of running combined with muscular training of the abdominal core / Efeitos da corrida aliada ao treinamento muscular do centro abdominal / Efectos de la carrera combinada con el entrenamiento muscular del núcleo abdominal

ABSTRACT Introduction: Running has specific effects on different areas of the human body, and the sagittal angular variation of the hip, knee, and ankle joints is widely explored. In addition to accelerating body metabolism, it can also improve body shape. Recent studies have revealed that running can also improve athletes' muscular strength of the abdominal core. Objective: Explore the effects of running combined with muscle training on the abdominal center strength of athletes. Methods: It investigated the effects of 3 different running intensities on athletes' abdominal core muscle strength. Computerized kinematic motion capture technology was used to measure the impacts of running on 18 young volunteers. The sagittal planes of the hip, knee, and ankle joints were evaluated. Abdominal center muscle strength was assessed during running. Results: Running particularly affected the combined contraction rate of the tibial, gluteal, and soleus muscles. The correlation between speed, muscle activation, and joint angle was also analyzed. Conclusion: Athletes tend to adjust the angle and frequency of joint movements to reduce fatigue. It was noted can have the ability to control muscle strength in different regions of the abdominal core. The research results establish a theoretical basis for the effectiveness of abdominal core muscle strength performance in athletes. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

RESUMO Introdução: A corrida tem efeitos específicos em distintas áreas do corpo humano e a variação angular sagital das articulações do quadril, joelho e tornozelo são amplamente exploradas. Além de acelerar o metabolismo corporal, também pode melhorar a forma corporal e alguns estudos recentes revelaram que a corrida também pode melhorar a força muscular do centro abdominal dos atletas. Objetivo: Explorar os efeitos da corrida aliada ao treinamento muscular sobre a força do centro abdominal dos atletas. Métodos: Investigou-se os efeitos de 3 diferentes intensidades de corrida sobre a força muscular do centro abdominal dos atletas. Foi utilizada a tecnologia de captura de movimento cinemática computadorizada para medir os impactos da corrida sobre 18 jovens voluntários. Os planos sagitais das articulações do quadril, joelho e tornozelo foram avaliados. A força muscular do centro abdominal foi avaliada durante a corrida. Resultados: A corrida afetou particularmente o índice combinado de contração dos músculos tibial, glúteo e sóleo. A correlação entre velocidade, ativação muscular e ângulo articular também foi analisada. Conclusão: Os atletas tendem a ajustar o ângulo e a frequência de movimentos articulares para reduzir a fadiga. Notou-se que os atletas também tem a capacidade de controlar a força muscular em diferentes regiões do centro abdominal. Os resultados da pesquisa estabelecem uma base teórica para a eficácia do desempenho de força muscular do centro abdominal nos atletas. Nível de evidência II; Estudos terapêuticos - investigação dos resultados do tratamento.

RESUMEN Introducción: Correr tiene efectos específicos en diferentes áreas del cuerpo humano y la variación angular sagital de las articulaciones de la cadera, la rodilla y el tobillo son ampliamente exploradas. Además de acelerar el metabolismo, también puede mejorar la forma del cuerpo y algunos estudios recientes revelaron que correr también puede mejorar la fuerza muscular del núcleo abdominal en los atletas. Objetivo: Explorar los efectos de la carrera combinada con el entrenamiento muscular en la fuerza del núcleo abdominal de los atletas. Métodos: Investigamos los efectos de 3 intensidades de carrera diferentes en la fuerza muscular del centro abdominal de los atletas. Se utilizó la tecnología de captura del movimiento cinemático por ordenador para medir los impactos de la carrera en 18 jóvenes voluntarios. Se evaluaron los planos sagitales de las articulaciones de la cadera, la rodilla y el tobillo. Se evaluó la fuerza muscular del núcleo abdominal durante la carrera. Resultados: Correr afectó especialmente a la tasa de contracción combinada de los músculos tibiales, glúteos y sóleo. También se analizó la correlación entre la velocidad, la activación muscular y el ángulo articular. Conclusión: Los deportistas tienden a ajustar el ángulo y la frecuencia de los movimientos articulares para reducir la fatiga. Se observó que los atletas también tienen la capacidad de controlar la fuerza muscular en diferentes regiones del núcleo abdominal. Los resultados de la investigación establecen una base teórica para la eficacia del rendimiento de la fuerza muscular del núcleo abdominal en los atletas. Nivel de evidencia II; Estudios terapéuticos - investigación de los resultados del tratamiento.

Comparison between Bruce and ramp protocols for exercise testing in the diagnosis of myocardial ischemia

BACKGROUND: Exercise tests are an important tool in the investigation of myocardial ischemia. The ramp protocol has gained increasing importance in clinical practice because of the possibility of individualizing its exercise intensity. OBJECTIVE: To assess and compare the sensitivity, specificity, and accuracy of Bruce and ramp protocols for exercise testing in the diagnosis of myocardial ischemia considering myocardial perfusion scintigraphy as the reference standard. Secondary objectives included the assessment of hemodynamic profiles, functional capacity, and the incidence of arrhythmias in each of the protocols. METHODS: Participants underwent exercise testing using the ramp and Bruce protocols, and the tests' diagnostic power was assessed. For testing the difference between data provided by both protocols, we used a paired Student's t-test or Wilcoxon test, depending on the assumption of data normality. The level of significance adopted for all tests was 5%. RESULTS: The ramp protocol showed sensitivity, specificity, and accuracy values of 55.6%, 82.4%, and 76.7%, respectively, whereas the Bruce protocol had results of 77.8%, 64.7%, and 67.4%, respectively. The maximum heart rate and double product at peak exercise were significantly higher in the Bruce protocol (p = 0.043 and p = 0.040, respectively). No differences were observed between the incidence of arrhythmias in both protocols. CONCLUSION: The Bruce protocol presented higher sensitivity for detecting ischemia on the exercise test, while the ramp protocol presented higher specificity and accuracy.

Isokinetic ankle muscle strength is reduced in recreational runners with medial tibial stress syndrome and is not associated with pain

Abstract Aim: The purpose of this study was to investigate the strength and ratios of the plantar flexors and ankle dorsiflexors in recreational runners with medial tibial stress syndrome and to assess the association between muscle strength and the level of pain in this population. Methods: Two groups (control and medial tibial stress syndrome) of eighteen runners each participated in this cross-sectional study. Isokinetic dynamometry was used to evaluate muscle strength, and for the analysis, the normalized isokinetic peak torque controlled by gender was used. Results: The medial tibial stress syndrome group showed lower normalized isokinetic peak torque in the dorsiflexors in the concentric (p = 0.008) eccentric (p = 0.011) contraction, as well as a lower plantar flexor, normalized isokinetic peak torque in the concentric (p = 0.001) and eccentric (p = 0.02) when compared to the control group. However, there was no difference in the normalized isokinetic peak torque ratio representative of the stance (p = 0.62) and swing phase (p = 0.16), and the level of pain was not correlated with the strength concentric (p = 0.32) and eccentric (p = 0.621) of plantar flexors, nor to the concentric (p = 0.21) and eccentric of dorsiflexors (p = 0.54). Conclusion: Recreational runners with MTSS showed decreased muscle strength in the sagittal plane of the ankle, no correlation with the level of pain, and no changing the ratio between plantar flexors and dorsiflexors.

Effects of Long-Term Tai Chi and Jogging on Neuromuscular Latency and Time to Peak of EMG in Older Males during Lateral Sudden Perturbation / 医用生物力学

Objective To compare the differences in long-term jogging and Tai Chi in terms of neuromuscular latency and time to peak of surface electromyography (EMG) in older males during lateral sudden perturbation. In addition, an effective means to enhance neuromuscular response and muscle contraction efficiency of older males during lateral postural challenges was investigated. Methods Postural reactions of young males, older sedentary male controls (without regular exercises), older male joggers (with long-term jogging practice), and older male Tai Chi participants (with long-term Tai Chi practice) were evoked by means of a sudden unpredictable lateral translation platform. Surface EMG signals of peroneus longus, anterior tibialis, gluteus medius, and erector spinae were collected by an EMG detection and analysis system. Results The latencies of peroneus longus, anterior tibialis, and gluteus medius were delayed in the older sedentary male controls compared with those in young males. The neuromuscular reactions of anterior tibialis and erector spinae in older Tai Chi male participants were faster than those of older sedentary male controls. The contraction speeds of peroneus longus, anterior tibialis, and gluteus medius in young males were higher than those in three older groups during sudden lateral perturbations. Conclusions Long-term Tai Chi practice can enhance the responses of ankle and trunk muscles of older males during lateral postural challenges, but it has little effect on the muscle contraction efficiency of older males.

Effects of quantified jogging on sleep and fatigue in maintenance hemodialysis patients / 现代临床护理

Objective To investigate the effect of quantified jogging with sports bracelet on sleep quality and fatigue in maintenance hemodialysis patients. Methods The study involved 30 patients treated with maintenance hemodialysis during January and June 2016 in the outpatient's department of the hospital. All the patients were required to take physical exercises by jogging individually for six months, setting up their own quantity by wearing sport bracelets for recording paces and sleep. During the six months, health education and follow-ups were done. The exercise quantity, sleep quality and tiredness were evaluated and compared between pre-and post-intervention. Result All the 30 patients completed the study. After 6 months, the total score by Pittsburgh sleep quality index and the sleep time after intervention were significantly better than those before intervention, respectively, and the score on fatigue after intervention was significantly lower than that before intervention (all P＜0.01). Conclusions The quantified jogging with sports bracelet among the hemodialysis patients can significantly alleviate their fatigue and improve the quality of sleep. As an option for the hemodialysis patients, it is worthy of clinical promotion.

Correlation between obesity and cardio respiratory fitness.

Background: Maximal oxygen consumption (VO2max) is considered the gold standard of cardio-pulmonary and muscle cell fitness. Reduced cardiopulmonary fitness is associated with increased cardiovascular disease. Low cardio respiratory fitness in young adults has emerged as an important factor for developing cardiovascular comorbidies later in middle age. Obesity is a serious & widespread problem globally. Increased body fat as predicted by body mass index is an additional factor for developing cardiovascular diseases. Aims & Objective: The current study was designed to evaluate cardio respiratory fitness in terms of VO2max in young healthy males and to correlate between obesity and cardio respiratory fitness. Material and Methods: Sixty young healthy male subjects in the age group of 18 to 22 years were included in this study group. Body mass index was measured as weight in kilograms divided by height in meters square. Cardio respiratory fitness in terms of VO2max was predicted by following the protocol of Treadmill Jogging Test (TMJ). Results: There was a highly significant negative correlation between obesity and VO2max, r= -0.88 p<0.05. In contrast, obesity shows a highly significant direct correlation with Treadmill Heart Rate, r=0.80 p<0.05. Conclusion: The result suggests that the reduced cardiac performance during progressive work rate exercise in obese individuals. Greater the BMI, more severe will be the functional impairment, suggesting excessive amount of body fat on cardio respiratory functions and oxygen uptake by working muscles.

Influence of jogging speed on lower limb joints and muscles of young women / 医用生物力学

Objective To study the effect of reasonable jogging speed on body shape and walking gait to make people acquire graceful posture through jogging. Method Five jogging speeds were selected according to related measurements. Kinematical data of subjects (15 young women volunteers) in jogging were measured by the motion capture system, while the EMG signals of 8 major muscles in lower limb were collected simultaneously. The mean angles of hip, knee and ankle joints in sagittal plane at different speeds were calculated. The subject whose data was closest to the mean value was chosen as the research subject and analyze the kinematical data. Results The angles of the subject's hip, knee and ankle joints in sagittal plane at different speeds in a gait cycle were presented, and activation curves of her 8 major muscles were obtained during lower limb movements. Relationships between the jogging speed, jogging stage, muscle activation and joint angle were described by the scoring method. Conclusions The range of joint angle and maximum of muscle activation don't change with jogging speed monotonously. The study provides a reference for young women to choose their own jogging speed.

DETERMINATION OF PREDICTORS OF INITIATING JOGGING SAFELY AFTER ANTERIOR CRUCIATE LIGAMENT RECONSTRUCTION / 体力科学

The purpose of this study was to determine if there were any reliable predictors for achieving jogging requirements after anterior cruciate ligament (ACL) reconstruction. We analyzed associations among variables collected from 128 subjects at 12 weeks postoperatively, including jogging parameters (i.e. pain, apprehension, speed, and distance), the isokinetic muscle strength of the leg extensors, the knee stability, and patient's profiles (i.e. age, sex, activity level, body mass index (BMI), meniscectomy, and cartilage injury).Jogging parameters were significantly correlated with the isokinetic muscle strength of leg extensors, but not with the knee stability. With the jogging ability of achieving a distance of 2000m at a velicity of 9km/h being an objective variable, a logistic regression analysis revealed that the isokinetic muscle strength of leg extensors and BMI were considered relevant. Using a receiver operating characteristic (ROC) curve analysis and a contingency table, the cut-off values of the isokinetic muscle strength of leg extensors to the uninvolved side and body weight were 85% and 1.9Nm/kg, respectively, whose sensitivity and specificity were 0.90 and 0.82, respectively. Therefore, we concluded that the isokinetic muscle strength of leg extensors is a reliable predictor for projecting the timing to start jogging after ACL reconstruction.

The Amount of Physical Activity of Korean Adults Measured from the 2001 Korean National Health and Nutrition Survey

BACKGROUND: The assessment of how much people exercise needs to be analyzed in order to promote their health status. METHODS: Accordingly, 2001 Korean National Health and Nutrition Survey was performed during a two-month period beginning November 1st, 2001. Questionnaires on physical activities have been completed by 9,170 persons (88.45%) among 10,368 persons over 12 years old. We analyzed 7,838 subjects who were over 20 years old. RESULTS: Among the total, 71.8% persons of the respondents did not work out at all. Among them, 14.9% respondents were classified as lower exercise group, 6.9% middle exercise group and 6.4% as higher exercise group. The number of middle and higher exercise groups were increased on 2001 survey compared to those in 1998. Daily walking hours were 65.8 +/- 73.6 minutes. A proper amount of exercise were performed by older age groups than those in their twenties, by town residents than villagers, by unmarried people than married or divorced or bereaved ones, by higher educated people, by people with more weight, by those who were felt less stress, and by non drinkers. Favorite exercises were walking, mountaineering, jogging and working out at a fitness club which were chosen by 62.6% of the respondents. CONCLUSION: Many respondents did not work out at all and overall exercise rate was low. The rate of proper exercise was different by demographic features.

Optimal frequency of jogging for a long period. part 2 / 体力科学

The study was performed to clear the optimal frequency of jogging for the senior subject. The subject had run for 23 years, from 1971 to 1994. The distance of jogging was 5 km a day. It increased to 25 km during the 3 months immediately before the 17 th Honolulu Marathon. The electro cardiogram, and biochemical analysis of blood had been measured for 23 years. Annual total distance was 800±50 (mean±SD) km from 1971 to1984, and 300±20 km from 1985 to 1992. A decrease in the distance of jogging ws due to a change in the frequency of jogging from four times per week to one time per 5 days. Arrhythmia, an abnormal finding of blood biochemical analysis, and change in body weight were not observed after the decrease in frequency of jogging. It was suggested that the optimal froquency of jogging may be one time per 5 days for the present subject.