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THORNTON, M. K., and J. A. POTTEIGER. Effects of resistance exercise bouts of different intensities but equal work on EPOC. Med. Sci. Sports Exerc., Vol. 34, No. 4, pp. 715-722, 2002.

Purpose: To compare the effect of low- and high-intensity resistance exercise of equal work output, on exercise and excess postexercise oxygen consumption (EPOC).

Methods: Fourteen female subjects performed a no-exercise baseline control (CN), and nine exercises for two sets of 15 repetitions at 45% of their 8-RM during one session (LO) and two sets of 8 repetitions at 85% of their 8-RM during another session (HI). Measures for all three sessions included: heart rate (HR) and blood lactate (La) preexercise, immediately postexercise and 20 min, 60 min, and 120 min postexercise; and ventilation volume ([latin capital V with dot above]E), oxygen consumption ([latin capital V with dot above]O2), and respiratory exchange ratio (RER) during exercise and at intervals 0-20 min, 45-60 min, and 105-120 min postexercise.

Results: Exercise [latin capital V with dot above]O2 was not significantly different between HI and LO, but [latin capital V with dot above]E, [La], and HR were significantly greater for HI compared with LO. Exercise RER for HI (1.07 /- 0.03 and LO (1.05 /- 0.02) were significantly higher than CN (0.86 /- 0.02), but there were no differences among conditions postexercise. EPOC was greater for HI compared with low at 0-20 min (HI,1.72 /- 0.70 LO2; LO, 0.9 /- 0.65, LO2), 45-60 min (HI, 0.35 /- 0.25 LO2; LO, 0.14 /- 0.19 LO2), and 105-120 min (HI, 0.22 /- 0.22 LO2; LO, 0.05 /- 0.11, LO2).

Conclusion: These data indicate that for resistance exercise bouts with an equated work volume, high-intensity exercise (85% 8-RM) will produce similar exercise oxygen consumption, with a greater EPOC magnitude and volume than low-intensity exercise (45% 8-RM).

(C) 2002 American College of Sports Medicine