EFFECT OF WEIGHT TRAINING EXERCISE AND TREADMILL EXERCISE ON POSTEXERCISE OXYGEN-CONSUMPTION

To compare the effect of weight training (WT) and treadmill (TM) exerc ise on postexercise oxygen consumption ((V) over dot O-2), 15 males (m ean +/- SD) age = 22.7 +/- 1.6 yr; height = 175.0 +/- 6.2 cm; mass = 8 2.0 +/- 14.3 kg) performed a 27-min bout of WT and a 27-min bout of TM exercise at matched rates of (V) over dot O-2. WT consisted of perfor ming two circuits of eight exercises at 60% of each subject's one repe tition maximum with a work/rest ratio of 45 s/60 s. Approximately 5 d after WT each subject walked or jogged on the TM at a pace that elicit ed an average (V) over dot O-2 matched with his mean value during WT. (V) over dot O-2 was measured continuously during exercise and the fir st 30 min into recovery and at 60 and 90 min into recovery. (V) over d ot O-2 during WT (1.58 L.min(-1)) and TM exercise (1.55 L.min(-1)) wer e nor significantly (P > 0.05) different; thus the two activities were matched for (V) over dot O-2. Total oxygen consumption during the fir st 30 min of recovery was significantly higher (P < 0.05) as a result of WT (19.0 L) compared with that during TM exercise (12.7 L). However , (V) over dot O-2 values at 60 (0.32 vs 0.29 L.min(-1)), and 90 min ( 0.33 vs 0.30 L.min(-1)) were not significantly different (P > 0.05) be tween WT and TM exercise, respectively. The results suggest that, duri ng the first 30 min following exercise, WT elicits a greater elevated postexercise (V) over dot O-2 than TM exercise when the two activities are performed at matched (V) over dot O-2 and equal durations. Theref ore, total energy expenditure as a consequence of WT will be underesti mated if based on exercise (V) over dot O-2 only.