Fatigue-induced changes in hamstrings' active muscle stiffness: effect of contraction type and implications for strain injuries.

ABSTRACT:

Purpose

Hamstring strain injuries may occur due to differential fatigue and compromised mechanical properties among the hamstring muscles. We examined (1) the effect of fatigue on hamstrings active muscle stiffness, and (2) whether contraction type affects active muscle stiffness changes during a submaximal fatiguing task.

Methods

Nine healthy males completed 99 submaximal knee flexions in isometric (ISO), concentric (CON), and eccentric (ECC) conditions. We measured the knee flexor maximal voluntary torque (MVT) (pre/post), shear wave velocity (SWV) during contraction and transverse relaxation times (T2) (pre/post) in biceps femoris long head (BFlh), semitendinosus (ST), and semimembranosus (SM) muscles.

Results

MVT decreased substantially after all conditions (- 18.

SUBMITTER: Evangelidis PE 

PROVIDER: S-EPMC10030419 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature