The present study was conducted to examine (a) whether there is an association between maximal oxygen up-take (VO2max) and reduction in postexercise heart rate (HR) and blood lactate concentrations ([La]) following resistance exercise and (b) how intensity and VOlume of resistance exercise affect postexercise VO2. Eleven regularly weight-trained males (20.8 +/- 1.3 years; 96.2 +/- 14.4 kg, 182.4 +/- 7.3 cm) underwent 4 sets of squat exercise on 3 separate occasions that differed in both exercise intensity and volume. During each testing session, subjects performed either 15 repetitions[middle dot]set-1 at 60% of 1 repetition maximum (1RM) (L), 10 repetitions[middle dot]set-1 at 75% of 1RM (M), or 4 repetitions[middle dot]set-1 at 90% of 1RM (H). During each exercise, VO2 and HR were measured before (PRE), immediately post (IP), and at 10 (10P), 20 (20P) 30 (30P), and 40 (40P) minutes postexercise. The [La] was measured at PRE, IP, 20P, and 40P. Decrease in HR (DHR) was determined by subtracting HR at 10P from that at IP, whereas decrease in [La] (D[La]) was computed by subtracting [La] at 20P from that at IP. A significant correlation (p < 0.05) was found between VO2max and DHR in all exercise conditions. A significant correlation (p < 0.05) was also found between VO2max and D[La] in L and M but not in H. The VO2 was higher (p < 0.05) during M than H at IP and 10P, while no difference was seen between L and M and between L and H. These results indicate that those with greater aerobic capacity tend to have a greater reduction in HR and [La] during recovery from resistance exercise. In addition, an exercise routine performed at low to moderate intensity coupled with a moderate to high exercise volume is most effective in maximizing caloric expenditure following resistance exercise.
(C) 2005 National Strength and Conditioning Association