Garnacho-Castaño Manuel V, Domínguez Raúl, Ruiz-Solano Pedro, Maté-Muñoz José L
1Department of Physiology and Immunology, Faculty of Biology, University of Barcelona, Barcelona, Spain; and 2Laboratory of Biomechanics and Exercise Physiology, Department of Physical Activity and Sports Science, Alfonso X El Sabio University, Madrid, Spain.
J Strength Cond Res. 2015 Oct;29(10):2867-73. doi: 10.1519/JSC.0000000000000956.
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.
本研究的目的是检测在对应乳酸阈值（LT）的负荷下进行半蹲（HS）抗阻运动时的急性代谢、力学和心脏反应。13名健康受试者完成了3次HS运动测试，每次测试间隔48小时休息：一次最大力量或1次重复最大值（1RM）测试、一次递增负荷测试以确定达到LT时的1RM百分比，以及一次在LT强度下的恒定负荷测试。在最后一次测试中，分别通过血乳酸浓度、反向运动跳跃测试中记录的高度（H）、平均功率（AP）和峰值功率（PP）以及心率（HR）来监测代谢、力学和心脏反应。在恒定负荷测试期间，乳酸浓度和HR保持稳定，而H、AP和PP则出现显著下降（p≤0.05）。血乳酸浓度与产生的H（r = 0.028）、AP（r = 0.072）和PP（r = 0.359）损失之间仅观察到低相关性。在LT下进行半蹲运动在主要为有氧代谢的情况下会引发稳定的HR和血乳酸反应，尽管这种运动方式会导致显著的力学疲劳。
