Nagle F J, Seals D R, Hanson P
Biodynamics Laboratory University of Wisconsin-Madison.
Int J Sports Med. 1988 Oct;9(5):313-5. doi: 10.1055/s-2007-1025030.
The purpose of this study was to test the hypothesis that differences in the pressor response to static exercise using varying muscle masses are due to differences in endurance time. i.e., time to fatigue. Ten healthy, male subjects (mean age 24 +/- 3 years) participated in the study. With no knowledge of the purpose of the study, the subjects were instructed to maintain static contractions for as long as possible during 30% maximal voluntary contraction (MVC) in handgrip (HG), two-leg extension (LE), and dead lifting (DL). Inability to sustain a contraction within 10% of the designated force (30% MVC) marked the endurance time end point. During sustained contractions, heart rate, blood pressure, and time to fatigue were measured. Times to fatigue were 3.39 +/- 0.92, 3.61 +/- 1.67, and 3.68 +/- 1.34 min for HG, LE, and DL, respectively. These differences were not significant (p greater than 0.05). Heart rate and blood pressure increased progressively with sustained contractions, DL greater than LE greater than HG. LE and DL responses were consistently and significantly (P less than 0.05) higher than HG responses reflecting the magnitude of absolute force of contractions. The magnitude of the pressor response to the three sustained static contraction maneuvers was not related to the time to fatigue. The data affirm the view that the pressor response is a function of muscle mass activated and the absolute force developed during static exercise.
使用不同肌肉群进行静态运动时，升压反应的差异是由于耐力时间（即疲劳时间）的差异所致。10名健康男性受试者（平均年龄24±3岁）参与了该研究。在受试者不知情的情况下，指导他们在握力（HG）、双腿伸展（LE）和硬拉（DL）的30%最大自主收缩（MVC）期间尽可能长时间地保持静态收缩。无法在指定力（30%MVC）的10%范围内维持收缩标志着耐力时间终点。在持续收缩期间，测量心率、血压和疲劳时间。HG、LE和DL的疲劳时间分别为3.39±0.92、3.61±1.67和3.68±1.34分钟。这些差异不显著（p>0.05）。随着持续收缩，心率和血压逐渐升高，DL>LE>HG。LE和DL的反应始终显著高于HG的反应（P<0.05），反映了收缩绝对力的大小。对三种持续静态收缩动作的升压反应幅度与疲劳时间无关。数据证实了这样一种观点，即升压反应是静态运动中激活的肌肉量和产生的绝对力的函数。
