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Effects of electrical stimulation‐induced leg training on skeletal muscle adaptability in spinal cord injury
Author(s) -
Crameri R. M.,
Weston A.,
Climstein M.,
Davis G. M.,
Sutton J. R.
Publication year - 2002
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1034/j.1600-0838.2002.20106.x
Subject(s) - stimulation , medicine , functional electrical stimulation , skeletal muscle , spinal cord injury , citrate synthase , endurance training , electrical muscle stimulation , myosin , endocrinology , spinal cord , anesthesia , chemistry , biochemistry , psychiatry , enzyme
Neuromuscular electrical stimulation has grown in popularity as a therapeutic device for training and an ambulation aid to human paralyzed muscle. Despite its current clinical use, few studies have attempted to concurrently investigate the functional and intramuscular adaptations which occur after electrical stimulation training. Six individuals with a spinal cord injury performed 10 weeks of electrical stimulation leg cycle training (30 min d −1 , 3 d week −1 ). The paralyzed vastus lateralis muscle showed significant alterations in skeletal muscle characteristics after the training, indicated by an improvement in total work output (52–112 kJ; P < 0.05), an increase in fiber cross‐sectional area (18 to 41 × 10 2 µm 2 ; P < 0.05), a reduction in the percentage of type IIX fibers (75% to 12%; P < 0.05), a decrease in myosin heavy chain IIx (68% to 44%; P < 0.05), an increase in capillary density (2–3.5 capillaries around fiber; P < 0.05) and increases in activity levels of citrate synthase (7–16 mU mg −1 protein) and hexokinase (1.2–2.4 mU mg −1 protein). This study showed that 10 weeks of electrical stimulation training of human paralyzed muscle induces concurrent improvements in functional capacity and oxidative metabolism .