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Vol. 84, Issue 2, 492-498, February 1998
Biomechanics and Human Performance Laboratories, School of Health and Human Performance, Department of Anatomy and Cell Biology, School of Medicine, and Department of Physical Therapy, School of Allied Health Sciences, East Carolina University, Greenville, North Carolina 27858
Hortobágyi, Tibor, Joseph Houmard, David Fraser,
Ronald Dudek, Jean Lambert, and James Tracy. Normal
forces and myofibrillar disruption after repeated eccentric exercise.
J. Appl. Physiol. 84(2): 492-498, 1998.
To investigate the "rapid-adaptation" phenomenon, we
examined force, neural, and morphological adaptations in 12 subjects
who performed 100 eccentric contractions with the quadriceps muscle
(bout 1) and repeated the same
exercise after a 2-wk hiatus (bout
2). Two days after bout
1, quadriceps muscle strength and surface
electromyographic (EMG) activity declined ~37 and 28%, respectively,
in the control group (n = 6). At
day 2 after bout 1, significant increases occurred in patellar tendon
reflex amplitude (~25%), muscle soreness (fivefold), and serum
creatine kinase (220%), and 65 ± 12% of the total number of pixels
in the EMG indicated myofibrillar disruption. At day
7 after bout 1, all variables returned to normal. At day 2 after bout 2, no significant changes
occurred in force, EMG, creatine kinase, or soreness, but reflex
amplitude increased, and 23 ± 4% of the total number of pixels in
the EMG still indicated myofibrillar disruption. The results suggest
that the rapid force recovery following eccentric exercise is mediated
at least in part by neural factors and that this recovery may occur
independently of cell disruption.
fatigue; electromyography; rapid adaptation; humans
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