Abstract
412 We used near-infrared spectroscopy (NIRS) to study noninvasively the effects of aging on changes in the muscle oxygenation during steady bicycle exercise. For the study 6 healthy young male and 13 healthy elderly male volunteers were recruited. To evaluate the physical fitness level and to determine exercise intensity, firstly the ventilatory threshold (VT) was measured. As a result, elderly subjects were devided into two groups by O2 uptake at VT (Elderly-H; 936.0±26.4, Elderly-L; 695.3±29.9, Young; 790.0±51.19ml). Secondly we measured muscle oxygenation by NIRS at rest and during exercise at relative work intensity of VT; 20, 40, 60, 80 and 100%. In all cases muscle oxygenation at rest and during exercise was expressed relative value from 100% oxygenation (oxygen capacity) established by thigh occlusion (ischemia). All subjects showed progressive deoxygenation with increasing intensity. There were no differences between three groups in muscle oxygenation during exercise at all relative work intensities of VT (ex. muscle oxygenation at 100% VT, Elderly-H,-35.1±7.4, Elderly-L; -22.7±7.4, Young; -42.3±6.7%). However when absolute work load was showed at same muscle oxygenation level, there were significant differences between groups (ex. at -10%, Elderly-H, 44.6±1.2, Elderly-L; 29.0±2.4, Young; 94.0±9.5Watt). This data suggested that aging and physical fitness level have no effect on muscle oxygenation below relative work intensity of VT.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call