Provita Zory Medical Center, Zory, Poland.
Department of Medical Sciences, The Wojciech Korfanty School of Economics, Katowice, Poland.
PLoS One. 2023 Apr 6;18(4):e0280231. doi: 10.1371/journal.pone.0280231. eCollection 2023.
The study aimed to evaluate the effects of ischemia used during the rest periods between successive sets on maximal number of performed repetitions, time under tension and bar velocity during the bench press exercise.
Thirteen healthy resistance trained men volunteered for the study (age = 28.5 ± 7.1 years; body mass = 87.2 ± 8.6 kg; bench press 1RM = 143.1 ± 20.7 kg; training experience = 11.0 ± 6.9 years). In experimental protocol the subjects performed 5 sets of bench press exercise at 70%1RM with maximal number of repetitions in each and with 5 minutes rest periods between each set. During the ischemia condition occlusion with 80% arterial occlusion pressure (AOP) was applied using a 10 cm wide cuff, before the first set of the bench press exercise and during all rest periods between sets (for 4.5 minute). During the control condition no ischemia was applied.
The two-way repeated measures ANOVA showed a statistically significant interaction effect for time under tension (p = 0.022; η2 = 0.20). However, the results did not show a statistically significant interaction effect for peak bar velocity (p = 0.28; η2 = 0.10) mean bar velocity (p = 0.38; η2 = 0.08), and for number of performed repetitions (p = 0.28; η2 = 0.09). The post hoc analysis for interaction showed significantly shorter time under tension for ischemia condition compared to control in set 1 (p < 0.01). The post hoc analysis for main effect of condition revealed that time under tension was significantly shorter for ischemia compared to control condition (p = 0.04).
The results of this study indicate that ischemia intra-conditioning does not increase strength-endurance performance as well as bar velocity during bench press exercise performed to muscle failure.
本研究旨在评估在连续组间休息期间使用缺血对平板卧推运动中最大重复次数、张力下时间和杠速度的影响。
13 名健康的抗阻训练男性志愿者参加了这项研究（年龄=28.5±7.1 岁；体重=87.2±8.6kg；平板卧推 1RM=143.1±20.7kg；训练经验=11.0±6.9 年）。在实验方案中，受试者以 70%1RM 的最大重复次数进行 5 组平板卧推运动，每组之间休息 5 分钟。在缺血条件下，在平板卧推运动的第一组之前和每组之间的所有休息期间（4.5 分钟），使用 10cm 宽的袖带施加 80%动脉闭塞压（AOP）的闭塞。在对照条件下不施加缺血。
双向重复测量方差分析显示，张力下时间存在统计学显著的交互效应（p=0.022；η2=0.20）。然而，峰值杠速度（p=0.28；η2=0.10）、平均杠速度（p=0.38；η2=0.08）和重复次数（p=0.28；η2=0.09）的结果没有显示出统计学显著的交互效应。交互作用的事后分析显示，与对照相比，缺血组在第一组中的张力下时间明显缩短（p<0.01）。条件主效应的事后分析表明，与对照条件相比，缺血时张力下时间明显缩短（p=0.04）。
本研究结果表明，在平板卧推运动至力竭时，缺血预处理并不能增加力量耐力表现以及杠速度。
