Decreased Muscle Oxygenation and Increased Arterial Blood Flow in the Non-Exercising Limb During Leg Exercise

Department of Judotherapy and Sports Medicine, Ryotokuji University, Chiba 279-8567, Japan.
Advances in Experimental Medicine and Biology (Impact Factor: 1.96). 01/2010; 662:379-84. DOI: 10.1007/978-1-4419-1241-1_55
Source: PubMed


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.

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    • "Compared with our result with the INVOS there is a significant difference with a MD of 2.9 (CI 0.2–5.6). Shiroishi et al. used the NIRO 200 on the flexor muscles of the forearm and found a resting StO2 of 61.4 ± 4.5% (n = 10) [24]. This is significant different from our results with the NIRO 200 NX (MD 8.0 CI 4.6 −11.4), but similar to our results with the NIRO 300 (MD 2.0 CI −1.1–5.1). "
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