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Effect of endurance training on the centrally‐induced muscle vasodilatation during one‐legged cycling
Author(s) -
Asahara Ryota,
Matsukawa Kanji,
Shintaku Takahiro
Publication year - 2017
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.31.1_supplement.712.9
Subject(s) - cycling , medicine , endurance training , vasodilation , muscle fatigue , deconditioning , physical therapy , physical medicine and rehabilitation , cardiology , electromyography , archaeology , history
Our laboratory has reported that central command contributes to increased blood flow in the non‐contracting vastus lateralis (VL) muscle during voluntary one‐legged cycling exercise in sedentary subjects. The present study aimed to examine whether the muscle vasodilator response is affected by endurance training. Seven trained athletes and seven sedentary men performed voluntary or passive one‐legged cycling exercise and mental imagery of the voluntary exercise for 1 min. Exercise intensity was set at 35% of the maximal voluntary exercise. The relative changes in oxygenated‐hemoglobin concentration (Oxy‐Hb) of the gluteus medius (GM) and VL muscles in the non‐exercising leg were measured as index of muscle tissue blood flow with near‐infrared spectroscopy. In both groups, the Oxy‐Hb of the GM and VL muscles increased at the start period of voluntary one‐legged cycling. The increases in Oxy‐Hb of the muscles were significantly greater in trained athletes than in sedentary subjects. In contrast, the Oxy‐Hb of the GM and VL muscles was unchanged at the start period of passive one‐legged cycling, suggesting that the initial increases in Oxy‐Hb of both leg muscles during the voluntary exercise were not derived from a feedback by limb mechanosensitive afferents. The Oxy‐Hb of both muscles also increased during mental‐imagery of voluntary one‐legged cycling and the responses were greater in the athletes as compared to the sedentary subjects. Taken together, it is likely that the muscle vasodilator effect by central command is augmented by endurance training.