To verify the on and off heart rate (HR) and HR variability (HRV) kinetics during a high-load aerobic exercise and a low-load aerobic exercise, with and without blood flow restriction (BFR). Methods: Fourteen healthy male subjects performed three randomly assigned experimental sessions: 1) 10 minutes walking at 40% of maximal aerobic speed (MAS) (40LL); 2) 10 minutes walking at 40% of MAS with BFR (40LL+BFR); and 3) 10 minutes running at 70% of MAS (70HL). The HR and HRV measurements were taken at rest, during exercise and the recovery period after constant load sessions. Results: The HR on-and off-kinetics, and HRV on-kinetics were faster in 40LL than in 40LL +BFR and 70HL (p < 0.05). The time constant (τon) of HR on-kinetics was faster in 40LL+BFR than in 70HL (23.4 ± 9.5 s vs 42 ± 9.5 s, respectively, p < 0.01), and was accompanied by faster HRV on-kinetics (12.4 ± 9.6 s vs 20.3 ± 13.7 s, respectively, p < 0.01). Although HR off-kinetics was not different between 40LL+BFR and 70HL, the recovery of time and frequency HRV indices were delayed in 70HL when compared to 40LL and 40LL+BFR (p < 0.05). Conclusions: These findings indicate that 40LL promoted faster cardiac adjustments compared to 40LL+BFR and 70HL sessions. Additionally, 40LL+BFR promoted faster cardiac adjustment and better HRV recovery compared to the 70HL session.
Objetivo: Investigar a influência da música de preferência no desempenho de resistência de força em exercícios dinâmicos com pesos em homens adultos jovens. Metodologia: Estudo transversal realizado com dez indivíduos do sexo masculino (idade 21,5 ± 3,3 anos, massa corporal 85,02 ± 17,18 kg, estatura 180,5 ± 6,59 cm), os quais realizaram testes de uma repetição máxima (1-RM) para os exercícios rosca direta e supino reto, a fim de determinar a carga do teste de resistência de força. Posteriormente, realizaram-se testes de resistência de força (quatro séries até a falha) a 70% de 1 RM, com e sem música de preferência. As variáveis analisadas nas quatro sessões foram o número de repetições, a percepção subjetiva de esforço (PSE), o estado de humor (∆BRUMS) e o índice de fadiga (IF). Resultados: Não existiu diferença ao se utilizar a música de preferência nos dois exercícios avaliados no número de repetições, IF e PSE (p>0,05). ∆BRUMS não foi influenciado em todas as dimensões do questionário na rosca direta (p>0,05) e em supino reto. Somente o vigor apresentou influência significante (p
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