To examine the impact of lower-extremity and trunk muscle fatigue on static and dynamic balance
An isokinetic dynamometer at constant angular velocities of 60°/s, 90°/s, 120°/s, and 180°/s was used to test the
isokinetic strength of knee and trunk muscles in 30 healthy sedentary volunteers (14 men and 16 women). Lowerextremity
fatigue was produced with the StairMaster, and trunk muscle fatigue was produced with an isokinetic dynamometer.
Static and dynamic balance measurements were assessed with a balance assessment system before and after
muscle fatigue in each subject.
There was a significant difference between the prefatigue - postfatigue trunk and lower extremity muscles and the
static balance scores. But the dynamic right, left and front balance test scores were not significantly different before and
after fatigue of the trunk and lower-extremity muscles.
Balance is affected by a generalized fatigue of trunk muscles and lower-extremity muscles. However, it appears
that static balance control is affected by the fatigue of trunk and lower-extremity muscles while dynamic balance is
affected partly by trunk and lower-extremity muscular fatigue.