title: Decreased muscle oxygenation and increased arterial blood flow in the non-exercising limb during leg exercise.
abstract: We evaluated arterial blood flow, muscle tissue oxygenation and muscle metabolism in the non-exercising limb during leg cycling exercise. Ten healthy male volunteers performed a graded leg cycling exercise at 0, 40, 80, 120 and 160 watts (W) for 5 min each. Tissue oxygenation index (TOI) of the non-exercising left forearm muscle was measured using a near-infrared spatially resolved spectroscopy (NIR(SRS)), and non-exercising forearm blood flow ((NONEX)FBF) in the brachial artery was also evaluated by a Doppler ultrasound system. We also determined O(2) consumption of the non-exercising forearm muscle (NONEXV(O)(2mus)) by the rate of decrease in O(2)Hb during arterial occlusion at each work rate. TOI was significantly decreased at 160 W (p < 0.01) compared to the baseline. The (NONEX)V(O)(2mus) at each work rate was not significantly increased. In contrast, (NONEX)FBF was significantly increased at 120 W (p < 0.05) and 160 W (p < 0.01) compared to the baseline. These results suggest that the O(2) supply to the non-exercising muscle may be reduced, even though (NONEX)FBF increases at high work rates during leg cycling exercise.
authors.affiliation: Department of Judotherapy and Sports Medicine, Ryotokuji University, Chiba 279-8567, Japan. cafe@foot.jp
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Shiroishi
authors.forename: Ryotaro
authors.initials: R
authors.lastname: Kime
authors.forename: Takuya
authors.initials: T
authors.lastname: Osada
authors.forename: Norio
authors.initials: N
authors.lastname: Murase
authors.forename: Kousuke
authors.initials: K
authors.lastname: Shimomura
authors.forename: Toshihito
authors.initials: T
authors.lastname: Katsumura
mesh_terms: D001158:Arteries / Q000502:physiology*; D001642:Bicycling / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005542:Forearm / Q000098:blood supply; D006801:Humans; D007866:Leg / Q000098:blood supply* / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D012039:Regional Blood Flow / Q000502:physiology*; D055815:Young Adult
chemical_list: D010100:Oxygen