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Resistance and aerobic training in older men: effects on VO2peak and the capillary supply to skeletal muscle
Hepple RT, Mackinnon SL, Goodman JM, Thomas SG, Plyley MJ
Journal of Applied Physiology 1997 Apr;82(4):1305-1310
clinical trial
5/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

Both aerobic training (AT) and resistance training (RT) may increase aerobic power (VO2peak) in the older population; however, the role of changes in the capillary supply in this response has not been evaluated. Twenty healthy men (age 65 to 74 yr) engaged in either 9 wk of lower body RT followed by 9 wk of AT on a cycle ergometer (RT to AT group) or 18 wk of AT on a cycle ergometer (AT to AT group). RT was performed three times per week and consisted of three sets of four exercises at 6 to 12 repetitions maximum. AT was performed three times per week for 30 min at 60 to 70% heart rate reserve. VO2peak was increased after 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 changes in VO2peak, whereas capillary density was increased only after AT (p < 0.01). These results, and the finding of a significant correlation between the change in capillary supply and VO2peak (r = 0.52), suggest the possibility that similar mechanisms may be involved in the increase of VO2peak after high-intensity RT and AT in the older population.

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