Effects of acute caffeine ingestion on the physical performance of amateur american football athletes / Efeitos da ingestão aguda de cafeína no desempenho de atletas amadores de futebol americano

ABSTRACT The aim of this study was to investigate the effects of acute caffeine ingestion (5 mg.kg-1) on jump, isometric strength and repeated sprint performance in amateur American football athletes. Twelve players (24.6 ± 3.66 years and 115.18 ± 24.35 kg of body weight) ingested a dose of caffeine (5 mg.kg−1) or placebo 60 min prior to a testing session consisting of: 1) countermovement jump (CMJ); 2) isometric mid-tight pull (IMTP); and 3) 3-line drills (200-yd shuttle runs with a 2-minute rest between sprints). Two testing sessions were performed using a double-blind, counterbalanced, crossover design during a pre-season training camp. Results indicated: Caffeine ingestion improved CMJ performance (p = 0.035), but no differences were observed on IMTP strength (p = 0.22) and line drill performance (total time: p = 0.65, and fatigue (%): p = 0.75) when compared to placebo condition. Conclusion: Acute caffeine ingestion improved jump performance, but not isometric strength and repeated sprint with change-of-direction performance in amateur American Football athletes.

RESUMO O objetivo deste estudo foi investigar os efeitos da ingestão aguda de cafeína (5 mg.kg-1) no salto, força isométrica e desempenho de sprints repetidos em atletas amadores de futebol americano. Doze jogadores (24,6 6 ± 3.66 anos e 115,18 ± 24.35 kg de peso corporal) ingeriram uma dose de cafeína (5 mg.kg−1) ou placebo 60 minutos antes de uma sessão de testes que consistia em: 1) Salto contramovimento (CMJ); 2) Meio-agachamento isométrico (IMTP); 3) Corrida de agilidade em L (3-line drill = corrida de agilidade de 200 jardas com 2 minutos de repouso entre os sprints). Duas sessões de teste foram realizadas usando um delineamento cruzado duplo-cego durante o período de pré-temporada de treinamento. Resultados indicaram: A ingestão de cafeína melhorou o desempenho do CMJ (p = 0,035), mas não foram observadas diferenças na força no IMTP (p = 0,22) e no desempenho do exercício de agilidade em L (tempo total: p = 0,65 e fadiga (%): p = 0,75) quando em comparação com a condição placebo. Conclusão: A ingestão aguda de cafeína melhorou o desempenho no salto, mas não na força isométrica e no desempenho de sprints repetidos com mudança de direção em atletas amadores de futebol Americano.

[Temporal analysis of the inclusion of Physical Education Professionals and Residents in the Brazilian Unified Health System (SUS) from 2009 to 2021]. / Análise temporal da inserção de Profissionais e Residentes de Educação Física no Sistema Único de Saúde de 2009 a 2021.

Physical Education is one of the categories featured in the SUS workforce. An ecological time series study, based on the National Registry of Health Establishments, was conducted to analyze the inclusion of Physical Education Professionals (PEFs) and residents in the SUS between 2009 and 2021. The scope of the article was to establish a panorama of the inclusion of Physical Education and analyze the distribution of PEFs and residents in the different regions. An increase of 476.01% in the number of PEFs and 10,366.67% among residents was revealed. The PEF rate per 100,000 inhabitants increased by 13.7% per year from 2009 to 2021, with an increase of 28.1% between 2009 and 2014 and 7.8% between 2014 and 2019, and a decrease of 3.4% between 2019 and 2021. The resident rate increased by 36.2% per year between 2009 and 2021, with a 45.9% increase between 2009 and 2017 and 18.7% between 2017 and 2021. Regional inequalities in the distribution of PEFs and residents were revealed, with the highest concentration, in 2021, in the Northeast and South regions, respectively. The increase in PEFs and residents in the SUS can be linked to policies and programs of physical exercise and activities, while the decrease is possibly related to the Previne Brasil Program and the COVID-19 pandemic.

Dentre as categorias que fazem parte da força de trabalho do SUS está a Educação Física. Por meio de estudo ecológico de séries temporais, com base no Cadastro Nacional de Estabelecimentos de Saúde, os objetivos do artigo foram analisar a inserção de Profissionais de Educação Física (PEF) e residentes no SUS entre 2009 e 2021 com vistas a traçar um panorama da inserção da Educação Física e analisar a distribuição de PEF e residentes entre as diferentes regiões. Foi revelado um aumento de 476,01% no número de PEF e de 10.366,67% entre os residentes. A taxa de PEF por 100.000 habitantes aumentou 13,7% ao ano entre 2009 e 2021, com aumento de 28,1% entre 2009 e 2014 e de 7,8% entre 2014 e 2019, e redução de 3,4% entre 2019 e 2021. A taxa de residentes aumentou 36,2% ao ano entre 2009 a 2021, com aumento de 45,9% entre 2009 e 2017 e de 18,7% entre 2017 e 2021. Foram reveladas desigualdades regionais na distribuição de PEF e residentes, com maior concentração, em 2021, respectivamente nas regiões Nordeste e Sul. O aumento de PEF e residentes no SUS pode ser relacionado com políticas e programas de práticas corporais e atividades físicas, enquanto o decréscimo, possivelmente, se relaciona com o Programa Previne Brasil e à pandemia de COVID-19.

Análise temporal da inserção de Profissionais e Residentes de Educação Física no Sistema Único de Saúde de 2009 a 2021 / Temporal analysis of the inclusion of Physical Education Professionals and Residents in the Brazilian Unified Health System (SUS) from 2009 to 2021

Resumo Dentre as categorias que fazem parte da força de trabalho do SUS está a Educação Física. Por meio de estudo ecológico de séries temporais, com base no Cadastro Nacional de Estabelecimentos de Saúde, os objetivos do artigo foram analisar a inserção de Profissionais de Educação Física (PEF) e residentes no SUS entre 2009 e 2021 com vistas a traçar um panorama da inserção da Educação Física e analisar a distribuição de PEF e residentes entre as diferentes regiões. Foi revelado um aumento de 476,01% no número de PEF e de 10.366,67% entre os residentes. A taxa de PEF por 100.000 habitantes aumentou 13,7% ao ano entre 2009 e 2021, com aumento de 28,1% entre 2009 e 2014 e de 7,8% entre 2014 e 2019, e redução de 3,4% entre 2019 e 2021. A taxa de residentes aumentou 36,2% ao ano entre 2009 a 2021, com aumento de 45,9% entre 2009 e 2017 e de 18,7% entre 2017 e 2021. Foram reveladas desigualdades regionais na distribuição de PEF e residentes, com maior concentração, em 2021, respectivamente nas regiões Nordeste e Sul. O aumento de PEF e residentes no SUS pode ser relacionado com políticas e programas de práticas corporais e atividades físicas, enquanto o decréscimo, possivelmente, se relaciona com o Programa Previne Brasil e à pandemia de COVID-19.

Abstract Physical Education is one of the categories featured in the SUS workforce. An ecological time series study, based on the National Registry of Health Establishments, was conducted to analyze the inclusion of Physical Education Professionals (PEFs) and residents in the SUS between 2009 and 2021. The scope of the article was to establish a panorama of the inclusion of Physical Education and analyze the distribution of PEFs and residents in the different regions. An increase of 476.01% in the number of PEFs and 10,366.67% among residents was revealed. The PEF rate per 100,000 inhabitants increased by 13.7% per year from 2009 to 2021, with an increase of 28.1% between 2009 and 2014 and 7.8% between 2014 and 2019, and a decrease of 3.4% between 2019 and 2021. The resident rate increased by 36.2% per year between 2009 and 2021, with a 45.9% increase between 2009 and 2017 and 18.7% between 2017 and 2021. Regional inequalities in the distribution of PEFs and residents were revealed, with the highest concentration, in 2021, in the Northeast and South regions, respectively. The increase in PEFs and residents in the SUS can be linked to policies and programs of physical exercise and activities, while the decrease is possibly related to the Previne Brasil Program and the COVID-19 pandemic.

A Educação Física como força de trabalho do SUS: análise dos tipos de vínculos profissionais / Physical Education as a workforce of the Brazilian Unified Health System: an analysis of the types of professional bonds / La Educación Física como fuerza de trabajo del Sistema Único de Salud: análisis de los tipos de vínculos de los profesionales

Resumo Considerando a inserção de Profissionais de Educação Física como força de trabalho no Sistema Único de Saúde, este estudo teve como objetivo analisar os tipos de vínculos e a carga horária de trabalho desses profissionais nos diferentes níveis de atenção à saúde e regiões do Brasil entre 2007 e 2021. Trata-se de um estudo descritivo de abordagem quantitativa com base em pesquisa no Cadastro Nacional de Estabelecimentos de Saúde. Foi observado que a atenção primária à saúde constitui o principal nível de atuação, seguida da atenção secundária e terciária. Na atenção primária, o número de cadastros de Profissionais de Educação Física com vínculo de trabalho precário é maior do que os com vínculo protegido, mas o inverso ocorre na atenção secundária e terciária. Nas regiões Sul e Sudeste, foi revelado maior número de cadastro desses profissionais com vínculo de trabalho protegido, e nas demais regiões prevaleceu o vínculo de trabalho precário. Foi identificado que 44,7% dos cadastros de Profissionais de Educação Física possuem carga horária maior ou igual a 40 horas por semana. Em conclusão, a atenção à saúde pode ser prejudicada pelo tipo de vínculo de trabalho do profissional por causar rotatividade e dificuldade na continuidade do cuidado.

Abstract Considering the insertion of Physical Education Professionals as a workforce in the Unified Health System, this study aimed to analyze the types of ties and the workload of these professionals in the different levels of health care and regions of Brazil between 2007 and 2021. This is a descriptive study of quantitative approach based on research in the National Register of Health Facilities. It was demonstrated that primary health care is the main level of action, followed by secondary and tertiary care. In primary care, the number of registrations of Physical Education Professionals with precarious employment is higher than those with protected employment, but the reverse occurs in secondary and tertiary care. In the South and Southeast regions, a greater number of records of these professionals with a protected work relationship was revealed, and in the other regions the precarious work relationship prevailed. It was identified that 44.7% of the registrations of Physical Education Professionals have workload greater than or equal to 40 hours per week. In conclusion, attention to health can be impaired by the type of the professional's work relationship by causing turnover and difficulty in the continuity of care.

Resumen Considerando la inserción de los Profesionales de Educación Física como mano de obra en el Sistema Único de Salud, este estudio tuvo como objetivo analizar los tipos de vínculo y la carga de trabajo de estos profesionales en los diferentes niveles de atención a la salud y regiones de Brasil entre 2007 y 2021. Se trata de un estudio descriptivo con enfoque cuantitativo basado en la investigación en el Registro Nacional de Establecimientos de Salud. Se ha demostrado que la atención primaria de salud es el principal nivel de actuación, seguida de la atención secundaria y terciaria. En atención primaria, el número de casos de Profesionales de Educación Física con vínculo de trabajo precario es mayor que aquellos con vínculo protegido, pero ocurre lo contrario en atención secundaria y terciaria. En las regiones Sur y Sudeste, se reveló un mayor número de registros de estos profesionales con relación de trabajo protegida, y en las demás regiones prevaleció la relación de trabajo precaria. Se identificó que el 44,7% de los registros de los Profesionales de Educación Física tienen carga horaria mayor o igual a 40 horas semanales. En conclusión, la atención a la salud puede verse obstaculizada por el tipo de empleo del profesional, ya que esto provoca rotación y dificultad en la continuidad de la atención.

Effect of Caffeine Ingestion on Indirect Markers of Exercise-Induced Muscle Damage: A Systematic Review of Human Trials.

The effect of caffeine on mitigating exercise-induced muscle damage (EIMD) is still poorly understood, but it was hypothesized that caffeine could contribute to decreasing delayed onset muscle soreness, attenuating temporary loss of strength, and reducing circulating levels of blood markers of muscle damage. However, evidence is not conclusive and beneficial effects of caffeine ingestion on EIMD are not always observed. Factors, such as the type of exercise that induces muscle damage, supplementation protocol, and type of marker analyzed contribute to the differences between the studies. To expand knowledge on the role of caffeine supplementation in EIMD, this systematic review aimed to investigate the effect of caffeine supplementation on different markers of muscle damage. Fourteen studies were included, evaluating the effect of caffeine on indirect muscle damage markers, including blood markers (nine studies), pain perception (six studies), and MVC maximal voluntary contraction force (four studies). It was observed in four studies that repeated administration of caffeine between 24 and 72 h after muscle damage can attenuate the perception of pain in magnitudes ranging from 3.9% to 26%. The use of a single dose of caffeine pre-exercise (five studies) or post-exercise (one study) did not alter the circulating blood levels of creatine kinase (CK). Caffeine supplementation appears to attenuate pain perception, but this does not appear to be related to an attenuation of EIMD, per se. Furthermore, the effect of caffeine supplementation after muscle damage on strength recovery remains inconclusive due to the low number of studies found (four studies) and controversial results for both dynamic and isometric strength tests.

Profile of blood pressure and glycemic responses after interval exercise in older women attending (in) a public health physical activity program.

BACKGROUND: and purpose: Interval exercise causes a positive impact on health status. Our aim was to evaluate the effects of a feasible and low-cost interval exercise on blood pressure and glycemic responses in people with controlled systemic arterial hypertension. METHODS: Thirteen women with hypertension (HG; age: 60.2 ± 2.8 years) and 11 without hypertension (CG; age: 54.4 ± 3.8 years) were recruited. Groups performed one session of interval exercise with elastic resistance (10 series of 1:1 min/effort:rest). RESULTS: There were slight reductions of absolute systolic blood pressure values for HG at 10, 30, and 60 min (4, 9, and 8 mmHg, respectively) at post-compared to pre-exercise. Glycemia was reduced (respectively, 17.6%, 17.6%, 19.4%, and 23.1%; p < 0.05) at pre-exercise vs. 0 min and 10, 30, and 60 min post-exercise for the HG. CONCLUSION: A single session of a feasible and low-cost interval exercise modifies and promotes significant clinical effects in blood pressure and glycemic levels in female older adults with and without hypertension.

Effect of contraction velocity in the eccentric phase on rating of perceived exertion / Efeito da velocidade de contração na fase excêntrica sobre a percepção subjetiva de esforço

ABSTRACT The objective of the present study was to analyze the influence of execution velocity on rating of perceived exertion (RPE) and on volume of repetitions at different velocities. Methods: The sample consisted of 10 male volunteers (23.4 ± 5.4 years old) with at least 6 months of experience in strength training. The participants performed 8 sets of up to 8 repetitions with an intensity of 60% of 1RM at different velocities of movement execution: slow cadence (6020), moderate cadence (2020) and free cadence. RPE (OMNI-RPE scale) and volume of repetitions performed in each condition were assessed. Results: The number of repetitions executed in the slow- and moderate-cadence protocols was smaller compared to that in the free protocol (p <0.05), as of the 2nd and 6th sets, respectively. RPE in the slow-cadence protocol was higher compared to that in the other cadences (p <0.05). Conclusion: The slow- and moderate-cadence protocols significantly reduce the number of repetitions performed and result in a greater rating of perceived exertion in comparison with free cadence.

RESUMO O objetivo do presente estudo foi analisar a influência da velocidade de execução na percepção subjetiva de esforço (PSE) e o volume de repetições em diferentes velocidades. Métodos: A amostra foi composta por 10 voluntários do sexo masculino (23,4 ± 5,4 anos), com no mínimo 6 meses de experiência no treinamento de força. Os participantes realizaram 8 séries de até 8 repetições com intensidade de 60% de 1RM em diferentes velocidades de execução de movimento: cadência lenta (6020), cadência moderada (2020) e cadência livre. Foram avaliadas a PSE (escala OMNI-RES) e o volume de repetição executadas em cada condição. Resultados: O número de repetições executadas nos protocolos de cadência lenta e moderada foi menor quando comparada ao protocolo livre (p < 0,05) a partir da 2ª e 6ª séries, respectivamente. A PSE no protocolo de cadência lenta foi maior quando comparado com as outras cadências (p<0,05). Conclusão: Os protocolos de cadência lenta e moderada reduzem significativamente o número de repetições realizadas e resultam em maior percepção subjetiva de esforço quando comparado com cadência livre.

Acute Caffeine Ingestion did not Enhance Punch Performance in Professional Mixed-Martial Arts Athletes.

Mixed martial arts (MMA) is a combat sport where competitors utilize strikes (punches, kicks, knees, and elbows) and submission techniques to defeat opponents in a cage or ring. The aim of this study was to investigate the effect of acute caffeine ingestion on punching performance by professional MMA athletes. The study used a double-blind, counterbalanced, crossover design. Eleven professional MMA competitors (27.6 ± 4.3 years and 83.5 ± 7.8 kg of body weight) ingested a dose of caffeine (5 mg·kg-1) or placebo 60 min prior to three sets of punching. Each set consisted of 15 s, at which participants were asked to perform straight punches with maximum strength and frequency with his dominant arm. After each set, a 45 s recovery time was applied. Using a force transducer attached to a cushioned plate, the punch frequency, and mean and maximal punch force was measured. The readiness to invest in both physical (RTIPE) and mental (RTIME) effort was assessed prior to the protocol, and the rating of perceived exertion (RPE) was recorded after. Caffeine ingestion did not result in increased punching frequency, mean and maximum punch force, RTIPE, RTIME, and RPE when compared to the placebo condition. Based on these results, acute caffeine ingestion did not improve punching performance in professional MMA athletes.