Some parameters of isometric strenght as a measure of muscular endurance

In the aim to determine muscular endurance, isometric contractions were used. Four different experimental sets were applied. They were measured endurance time (in s) in three tests: t75%Fmax, t50%Fmax, and t25% Fmax. All of them were performed until exhaustion. Decrease of muscular strength in 20s maximal voluntary contraction (MVC) was recorded in the last experiment. Reduce of force and speed of this process was described using relative and absolute parameters. In every case, the period between experiments was one week. The muscles of dominant hand were investigated in 168 males and 256 females. The results of researches were processed statistically and discussed. It seems, that maximal voluntary contraction (MVC) could be used to describe muscle fibers composition. Generally, isometric contraction describes muscular endurance rather poor. It is possible to estimate muscular endurance within the same subject (or subjects at the same level of muscular force) using the set force of 50% Fmax until exhaustion (t50%Fmax).