To evaluate ultrasound’s effectiveness after eccentric-exercise-induced muscle damage.
Random assignment to ultrasound (UT) or placebo (PT). Ultrasound was applied immediately and 24, 48, and 72 h after 50 maximum eccentric contractions of the biceps.
Concentric and eccentric peak torques, resting elbow angle, and subjective muscle soreness were measured before and 24, 48, 72, and 96 h afterward.
No significant differences between UT and PT for biceps concentric or eccentric peak torque were noted. Both groups exhibited significant (P < .01) depression in eccentric and concentric peak torques with a slow return toward preexercise values over 96 h. Resting elbow angles for both groups were significantly lower than preexercise values up to 96 h (P < .01). Muscle soreness increased significantly (P < .05) at 24 and 48 h and returned to preexercise levels by 96 h.
Daily ultrasound did not influence recovery after eccentric-exercise-induced muscle damage.
The authors are with the Dept of Kinesiology and Physical Education, Wilfrid Laurier University, Waterloo ON, Canada N2L 3C5.