Characteristics of isometric and dynamic strength loss following eccentric exercise-induced muscle damage.

摘要: Angle-specific isometric strength and angular velocity-specific concentric of the knee extensors were studied in eight subjects (5 males 3 females) following a bout muscular damaging exercise. One hundred maximal voluntary eccentric contractions performed prone position through range motion from 40 degrees to 140 (0 = full extension) at 1.57 rads(-1). Isometric peak torque was measured whilst seated 10 80 flexion, corresponding short optimal muscle length, respectively. Isokinetic 0.52 3.14 rad x s(-1). Plasma creatine kinase (CK) activity also fingertip blood sample. These measures taken before, immediately after on days 1, 2, 4, 7 The exercise protocol resuited greater relative loss (P< 0.05) length (76.3 +/- 2.5% pre-exercise values) compared (82.1 2.7%). There no differences between isokinetic CK significantly elevated above baseline 4 (P < 0.01) 0.01). appeared persist throughout seven-day testing period provides indirect evidence shift angle-torque relationship towards longer lengths. results lend partial support popping sarcomere hypothesis damage, but could be explained by an impairment activation