Effect of 6 d of exercise training on responses to maximal and sub-maximal exercise in middle-aged men

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Abstract
Nine sedentary men (53 ± 3 yr) were studied before and after 6 d of endurance exercise training to determine the effects on maximal oxygen uptake (VO2 max), and on the heart rate, blood pressure, and metabolic responses to a standard bout of steady-state sub-maximal exercise. The subjects exercised approximately 1 h-d-1 at about 68% of VO2 max. The 6-d protocol elicited no improvement in VO2 max, (2.50 ± 0.14 before vs 2.58 ± 0.15 1-min-1 after training). Heart rates were significantly lower by 5 to 8 b-min-1, systolic blood pressures were reduced by 16 to 19 mm Hg, and blood lactate concentrations were 25 to 35% less at the same exercise intensities (60, 70, and 80% of VO2 max) after 6 d of exercise. Rate pressure product was about 15% lower at the same exercise intensity after 6 d of training (P2 max in sedentary, middle-aged men who are capable of vigorous exercise.

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