Abstract des Autors

Objective: To determine the acute effects of a needle muscle biopsy of the vastus lateralis on knee extension and flexion strength and endurance. Design: Pretest-posttest design. Testing order of right or left leg was randomly determined. Setting: Research Laboratory, University of Alberta, Edmonton Alberta, Canada. Participants: The subjects were 8 female and 11 male volunteers who were recreationally active. The mean age, height, and weight were 23+/-5 years, 174.6+/-9.2 cm, and 73.5+/-7.3 kg, respectively. Intervention: Isokinetic testing for knee extension and flexion was performed on both legs before and after a biopsy of the right vastus lateralis muscle. Main Outcome Measures: Knee extension and flexion peak torque measured at an angular velocity of 1.05 rad/s. Mean torque during 25 consecutive maximal contractions at 3.14 rad/s for knee extension and flexion exercise. Results: There was a significant decrease in right knee extension peak torque after the biopsy of the vastus lateralis muscle. No other differences were noted. Conclusions: These findings demonstrated an acute inhibition of knee extension peak torque but not endurance because of a muscle biopsy of the involved musculature. Verf.-Referat