Key result
Lactate threshold half-squats maintain stable HR and blood lactate but reduce jump height and power.
Why the study?
Acute metabolic, mechanical, and cardiac responses to half-squat resistance exercise at the lactate threshold intensity were not well characterized.
Does half-squat resistance exercise at the lactate threshold intensity alter metabolic, mechanical, and cardiac responses in healthy subjects?
Does half-squat resistance exercise at the lactate threshold intensity alter metabolic, mechanical, and cardiac responses in healthy subjects?
p-value: p=≤0.05
Half-squat exercise at the lactate threshold elicits stable heart rate and blood lactate responses within a predominantly aerobic metabolism, but induces significant mechanical fatigue.
Stable lactate/HR during HS at LT supports aerobic-dominant sessions; leaves open whether mechanical fatigue limits repeated efforts in training.
The purpose of this study was to examine acute metabolic, mechanical, and cardiac responses to half-squat (HS) resistance exercise performed at a workload corresponding to the lactate threshold (LT). Thirteen healthy subjects completed 3 HS exercise tests separated by 48-hour rest periods: a maximal strength or 1 repetition maximum (1RM) test, an incremental load test to establish the % 1RM at which the LT was reached, and a constant load test at the LT intensity. During the last test, metabolic, mechanical, and cardiac responses were monitored respectively through blood lactate concentrations, height (H), average power (AP) and peak power (PP) recorded in a countermovement jump test, and heart rate (HR). During the constant load test, lactate concentrations and HR remained stable whereas significant reductions were detected in H, AP, and PP (p ≤ 0.05). Only low correlation was observed between lactate concentrations and the H (r = 0.028), AP (r = 0.072), and PP (r = 0.359) losses produced. Half-squat exercise at the LT elicits stable HR and blood lactate responses within a predominantly aerobic metabolism, although this exercise modality induces significant mechanical fatigue.
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Garnacho‐Castaño et al. (2015) studied Healthy (n=13). Half-squat resistance exercise at lactate threshold intensity was evaluated on Metabolic, mechanical, and cardiac responses (blood lactate, jump height, average power, peak power, heart rate) (p=≤0.05). Half-squat exercise at the lactate threshold elicited stable heart rate and blood lactate responses but induced significant reductions in jump height, average power, and peak power (p≤0.05).
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