Effects of consecutive eccentric training at different range of motion on muscle damage and recovery.
This study compared two training regimens in which knee extensor exercises were performed at different range of motion.


METHODS
Sixteen males performed bouts of 90 maximal isokinetic eccentric contractions over 6 consecutive days (B1-B6) at either small (n=8) or large (n=8) range of motion. Average of peak torque (Mp) of each of the 90 contraction trials were calculated, plasma creatine kinase (CK) and lactate dehydrogenase (LDH) activities were measured before, 24 h, 48 h and 6 d after B1. Muscle soreness was evaluated every day during the experiment.


RESULTS
At B3 Mp reduced more in group L than in group S. From B1 to B6 group S increased Mp, while in group L Mp did not return to the baseline level. In both groups CK activity elevated 24 h following B1. CK activity was significantly higher in group L 6d after B1. In group L muscle soreness was higher at 48 h, 72 h, 4 d and 5 d after B1.


CONCLUSIONS
High-intensity, consecutive eccentric knee extensor exercise training at large range of motion may induce greater development of muscle damage and force deficit, than training at small range of motion. Training at small range of motion may induce early adaptation in voluntary torque production.
Váczi
M
M
Department of Biomechanics, Faculty of Physical Education and Sport Science, Semmelweis University, Budapest, Hungary. mvaczi@freemail.hu
Costa
A
A
Rácz
L
L
Tihanyi
J
J
D000222:Adaptation, Physiological; D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000097:blood; D001696:Biomechanical Phenomena; D003402:Creatine Kinase / Q000097:blood; D015444:Exercise; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D007770:L-Lactate Dehydrogenase / Q000097:blood; D008297:Male; D009119:Muscle Contraction; D009135:Muscular Diseases / Q000209:etiology / Q000473:pathology / Q000503:physiopathology*; D010146:Pain / Q000209:etiology / Q000473:pathology / Q000503:physiopathology*; D052097:Quadriceps Muscle / Q000201:enzymology / Q000473:pathology / Q000503:physiopathology*; D016059:Range of Motion, Articular; D020127:Recovery of Function; D013997:Time Factors; D019415:Torque; D055815:Young Adult
D015415:Biomarkers; D007770:L-Lactate Dehydrogenase; D003402:Creatine Kinase