Introduction: Powerlifting (PWL) is a worldwide method, frequently used in resistance training programs. However, the relationship between cardiovascular responses and PWL is still unclear in the literature. Objective: To evaluate acute cardiovascular overload and post-exercise hypotension (PEH) after acute powerlifting exercise session in subjects with experience in the modality. Methods: Nine powerlifting athletes (34 ± 5 years) participated voluntarily in this study. The following exercises were used in the session: squat, bench press and deadlift (95% of 1 RM, 2 to 5 repetitions). The anthropometric parameters and blood pressure (systolic, diastolic and mean) were evaluated immediately, 5' , 10' , 30' , 60' and 24 hours after the exercise session with a non-invasive automatic pressure monitor. Results: Significant differences (p<0.05) were found between rest and immediately after exercise on systolic (135 ± 6 vs. 153 ± 10 mmHg) and mean (102 ± 3 vs. 108 ± 3 mmHg) blood pressures, but no difference was found at diastolic (85 ± 3 vs. 85 ± 4 mmHg) blood pressure. Additionally, the increase in systolic pressure did not reach values considered as a risk of cardiovascular overload. Significant PEH was found after 60 minutes (systolic: -12 ± 12%, diastolic: -5 ± 6% and mean: -7 ± 5%) and 24 hours after PWL session (systolic: -5 ± 4%, diastolic: -8 ± 4% and mean: -7 ± 3%). Conclusion: Our data demonstrated that a PWL session does not increase systolic blood pressure up to the risk range and promotes PEH after 60 minutes of exercise and that this cardiovascular response persisted after 24 hours post-exertion in powerlifting athletes.
RESUMOObjetivo: O presente estudo avaliou o efeito do exercício de endurance (corrida) sobre o subseqüente desempenho de força de músculos dos membros superiores e do tronco. Metodologia: A amostra foi composta por 13 universitárias, saudáveis e fisicamente ativas. A primeira fase do experimento consistiu na realização de um teste de corrida, simulando uma sessão de treino, com duração de 45 minutos a 70% da FC MAX . Imediatamente após a corrida, foram aplicados testes de força (dinamometria -preensão palmar, teste de 1-RM e teste de repetições máximas a 70%-1RM no supino). A glicemia foi mensurada no início do experimento e imediatamente antes dos testes de força. Resultados: Não foi observada diferença significativa no desempenho dos testes de força após o treino de corrida (dinamometria, 1-RM e REPMAX -sem a prévia execução do treino de corrida -29,9 ± 3,8 kgf; 34,4 ± 3,1 kg; 1 o set: 12,5 ± 3,3 reps e 2 o set: 11,7 ± 2,7 reps vs. com a prévia execução do treino de corrida -29,2 ± 3,1 kgf; 33,9 ± 2,5 kg; 1 o set: 13,2 ± 2,1 reps e 2 o set: 12,2 ± 2,8 reps). Com relação à glicemia, não foi detectada alteração significativa durante o experimento. Conclusão: A execução do treino de corrida não afetou o subseqüente desempenho de força dos membros superiores e do tronco. Esse dado sugere que a interferência, freqüentemente, observada no exercício concorrente, é dependente do grupo muscular treinado. Possivelmente, o efeito adverso induzido pelo treino concorrente, realizado, exclusivamente, com membros inferiores, é decorrente da fadiga residual instalada nos músculos recrutados na atividade anterior. É importante ressaltar que a atividade de endurance não promoveu alteração na concentração plasmática de glicose. A manutenção da glicemia associada à ausência de interferência sobre o desempenho dos testes de força reforça, mais ainda, a hipótese de que o efeito adverso do treinamento concorrente é, provavelmente, causado por alterações periféricas músculo-específicas.Palavras-chave: treinamento concorrente, interferência, endurance, força. ABSTRACTAim: the present study evaluated the effect of endurance exercise (running) on the subsequent strength performance of muscles of upper limbs and trunk. Methodology: Thirteen healthy female, university students, physically active were selected to compose the sample. The first phase of the experiment the subjects were submitted to an endurance exercise bout (treadmill), simulating a training session, with duration of 45 minutes at 70% of the HR max . Immediately after the endurance exercise bout, the subjects performed strength tests (Dynamometry test -handgrip, 1RM test and maximal repetitions test at 70%-1RM in the bench press). Glycemia was measured in the beginning of the experiment and immediately before the strength tests. Results: No significant difference was observed in the strength tests performance after the endurance exercise bout (Dynamometry, 1-RM and REPMAX -with no previous endurance exercise -29.9 ± 3.8 kgf; 34.4 ± 3.1 kg; 1 st set 12.5 ± 3.3 reps and 2 nd ...
The present study compared the changes in markers of muscle damage after bouts of resistance exercise employing the Multiple-sets (MS) and Half-pyramid (HP) training systems. Ten healthy men (26.196.3 years), who had been involved in regular resistance training, performed MS and HP bouts, 14 days apart, in a randomised, counter-balanced manner. For the MS bout, participants performed three sets of maximum repetitions at 75%-1RM (i.e. 75% of a One Repetition Maximum) for the three exercises, starting with the bench press, followed by pec deck and decline bench press. For the HP bout, the participants performed three sets of maximum repetitions with 67%-1RM, 74%-1RM and 80%-1RM for the first, second and third sets, respectively, for the same three exercise sequences as the MS bout. The total volume of load lifted was equated between both bouts. Muscle soreness, plasma creatine kinase (CK) activity, myoglobin (Mb) and C-reactive protein (CRP) concentrations were assessed before and for three days after each exercise bout, and the changes over time were compared between MS and HP using two-way repeated measures ANOVA. Muscle soreness developed significantly (P B0.01) after both bouts, but no significant difference was observed between MS and HP. Plasma CK activity and Mb concentration increased significantly (P B0.01) without significant differences between bouts, and CRP concentration did not change significantly after either bout. These results suggest that the muscle damage profile is similar for MS and HP, probably due to the similar total volume of load lifted.
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