EFEITO AGUDO DO TREINAMENTO DE FORÇA COM DIFERENTES INTERVALOS ENTRE SÉRIES SOBRE LACTATO SANGUÍNEO E VARIABILIDADE DA FREQUÊNCIA CARDÍACA EM HOMENS JOVENS ATIVOS NÃO HIPERTENSOS

Abstract

This study investigated the acute effects of strength training with different rest intervals between sets on blood lactate and heart rate variability (HRV) in young, physically active, non-hypertensive men (n=8). Two protocols were applied: 3 sets with a 2-minute interval (TR) and 3 sets with a 30-second interval (IC). Blood lactate, heart rate (HR), and systolic and diastolic blood pressure (SBP/DBP) increased immediately after both protocols, decreasing during recovery. Lactate and HR were higher in the IC group. No significant differences in HRV were observed between protocols, but values such as SDNN and LF/HF increased during the recovery period compared to pre-training. It was concluded that shorter rest intervals between sets result in higher lactate levels but produce similar effects on HRV compared to longer intervals.