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Effects of branched‐chain amino acid (BCAA) supplementation before and after exercise on delayed‐onset muscle soreness (DOMS) and fatigue
Author(s) -
Watanabe Satoko,
Inaguma Asami,
Bajotto Gustavo,
Sato Juichi,
Kobayashi Hisamine,
Mawatari Kazunori,
Shimomura Yoshiharu
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.21.5.a331-b
Subject(s) - delayed onset muscle soreness , placebo , medicine , squat , myalgia , crossover study , muscle fatigue , visual analogue scale , physical therapy , physical medicine and rehabilitation , electromyography , muscle damage , alternative medicine , pathology
We have examined effects of BCAA supplementation on DOMS and muscle fatigue induced by squat exercise in humans. In a previous study, we found that BCAA supplementation before exercise effectively decreased DOMS and muscle fatigue. In the present study, we examined the effects of intake of BCAAs after exercise on DOMS and muscle fatigue using 12 healthy female adults, who did not take regular exercise. The experiment was conducted with crossover and double blind design. A test solution (200 ml) used in this study contained 5.5 g BCAAs (I:L:V = 1:2.3:1.2), and a placebo solution (200 ml) 5.5 g dextrin instead of BCAAs. The squat exercise consisted of 7 sets of 20 squats/set (total 140 squats), with 3 min intervals between each set. During each set, squats were performed every 2 s. Subjects ingested either solution at 0.1 g BCAAs or dextrin/kg BW immediately after squat exercise. DOMS and muscle fatigue were evaluated by a visual analog scale (VAS). These experimental procedures were the same as those in the previous report for BCAA supplementation before exercise. In the present study, DOMS (showing a peak on the 2nd and 3rd days) and muscle fatigue were tended to be less in the BCAA trial than in the placebo trial, but not significantly different between two trials. These results suggest that BCAA supplementation after exercise may not be effective to decrease DOMS and muscle fatigue, compared to the supplementation before exercise.