Peak oxygen uptake during running and arm cranking normalized to total and regional muscle mass measured by magnetic resonance imaging
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概要
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The purposes of our study were to determine the peak oxygen uptake (VO_＜2peak＞) per total or regional skeletal muscle (SM) mass using magnetic resonance imaging (MRI) and to investigate the relationships between SM mass and VO_＜2peak＞ during running and arm cranking. Eight male college swimmers aged 18-22 years [mean (SD) age 20.0 (1.3) years] were recruited to participate in this study. VO_2 during running and arm cranking were measured using an automated breath-by-breath mass spectrometry system. Contiguous MRI slices were obtained from the first vertebra cervicale to the malleolus lateralis (1.0-cm slice thickness, 0-cm interslice gap), resulting in a total of approximately 156 images for each subject. The absolute VO_＜2peak＞ and the VO_＜2peak＞ per body mass during running and arm cranking were 3.6 (0.6) 1.min^＜-1＞, 54.4 (5.9) ml.min^＜-1＞ and 2.5 (0.5) l.min^＜-1＞, 36.9 (5.3) ml.min^＜-1＞.kg^＜-1＞, respectively. The absolute VO_＜2peak＞ was higher (P<0.05) during running than during arm cranking, but not the VO_＜2peak＞ per regional area SM mass. The lower body SM mass was correlated to the VO_＜2peak＞ during running (r=0.95, P<0.001). All measurements and calculated values were expressed as the mean (SD) for the eight subjects. To eliminate the influence of body mass and fat-free mass (FFM), a regression analysis was performed on the mass-residuals of the VO_＜2peak＞ during running and the lower body SM mass. The residuals of lower body SM mass were correlated to the residuals of VO_＜2peak＞ during running, with respect to body mass (r=0.90, P<0.001) and FFM (r=0.82, P<0.05). These results suggest that the MRI-measured lower body SM mass was closely associated to the absolute VO_＜2peak＞ during running, independently of body mass or FFM, and that the VO_＜2peak＞ per regional SM mass corresponded, regardless of the type of exercise (upper or lower body).
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