Abstract

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 fatique. 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). Inhability 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 fatique were measured. Times to fatique 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> 0.05). Heart rate and blood pressure increases progressively withconsistently and significantly 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 music mass activated and the absolute force developed during static exercise. Verf.-Referat