Resistance and aerobic training in older men: effects on VO2 peak and the capillary supply to skeletal muscle |
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Authors: | Hepple, R. T. Mackinnon, S. L.M. Goodman, J. M. Thomas, S. G. Plyley, M. J. |
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Abstract: | Hepple, R. T., S. L. M. Mackinnon, J. M. Goodman, S. G. Thomas, and M. J. Plyley. Resistance and aerobic training in oldermen: effects onO2 peak and thecapillary supply to skeletal muscle. J. Appl.Physiol. 82(4): 1305-1310, 1997.Both aerobic training (AT) and resistance training (RT) may increase aerobic power(O2 peak) in theolder population; however, the role of changes in the capillary supplyin this response has not been evaluated. Twenty healthymen (age 65-74 yr) engaged in either 9 wk of lower body RTfollowed by 9 wk of AT on a cycle ergometer (RTAT group) or 18 wk of AT on a cycle ergometer (ATAT group). RT was performedthree times per week and consisted of three sets of four exercises at6-12 repetitions maximum. AT was performed threetimes per week for 30 min at 60-70% heart ratereserve. O2 peak was increasedafter both RT and AT (P < 0.05).Biopsies (vastus lateralis) revealed that the number of capillaries per fiber perimeter length was increased after both AT and RT(P < 0.05), paralleling the changesin O2 peak, whereascapillary density was increased only after AT(P < 0.01). These results, and thefinding of a significant correlation between the change in capillarysupply and O2 peak(r = 0.52), suggest the possibility that similar mechanisms may be involved in the increase ofO2 peak afterhigh-intensity RT and AT in the older population. |
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