Maximal short term Exercise Capacity in Healthy Subjects Aged 15-70 Years

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Abstract
Fifty males and 50 females, 15-71 yr of age, exercised maximally for 30s on an isokinetic ergometer at a pedalling frequency of 60 rev/min. Results were compared with maximal O2 uptake (.ovrhdot.VO2 max.) obtained in a progressive incremental exercise test. Total work in 30 s was higher in males than females, declined linearly by .apprx. 6% per decade of age (r = -0.65), and was related closely to height (r = 0.75) and to lean thigh volume estimated anthropometrically (r = 0.84). A close association with vital capacity (r = 0.86) was also found that accounted statistically for the combined effects of age and height. The percentage decline in power during 30 s (fatigue index) was lower in subjects reporting greater leisure activity. A close relationship was found between total work in 30 s and .ovrhdot.VO2 max. (r = 0.86), with vital capacity and leisure activity exerting additional influences on .ovrhdot.VO2 max. (P < 0.001; multiple r = 0.93). The well-established reduction with age in .ovrhdot.VO2 max. is associated with an apparent parallel reduction in the power output capacity of large muscle groups recruited in heavy dynamic leg exercise.