Postexercise oxygen consumption and substrate use after resistance exercise in women

Objective: This study investigated the acute effects of 45 min of resistanc e exercise (RE) on excess postexercise oxygen consumption (EPOC) and substr ate oxidation 120 min after exercise in moderately trained women. Methods: Ten RE trained women (age = 29 +/- 3 yr: ht = 168 +/- 8.3 cm; wt = 59 +/- 5 .7 kg; (V)over dotO(2max) = 38.3 +/- 4.7 mL.kg(-1).min(-1)) underwent two t rials: control sifting and RE. Subjects acted as their own controls in a ra ndom counterbalanced design. A 2-d nonexercise period was established betwe en testing trials. Oxygen consumption (V)over dotO(2) and respiratory excha nge ratio (RER) were measured continuously by indirect calorimetry before, during, and after exercise and on a separate control day. RE consisted of 3 sets of 10 exercises at 10-repetition maximum with a 1-min rest period bet ween each set. Fingertip samples of blood lactate concentration [BL] were c ollected immediately postexercise and every 30 min thereafter until [BL] re turned to resting baseline values after exercise. Results: The overall 2-h EPOC was 6.2-L (RE = 33.4 +/- 5.1 L vs control = 27.2 +/- 0.3 L), correspon ding to an 18.6% elevation over the control period. RER was significantly ( P < 0.01) below the control RER from minute 30 to minute 120 postexercise ( RE = 0.75 <plus/minus> 0.01 vs control = 0.85 +/- 0.01). During the last 30 min of recovery, (V)over dotO(2) and [BL] had returned to control/baseline values and fat oxidation was significantly (P < 0.0001) higher (29.2 vs 16 .3 kcal) after RE compared with the control trial. Conclusion: These data i ndicate that in young RE trained women. acute RE produces a modest increase in (V)over dotO(2) during a 2-h recovery period and an increase in fat oxi dation.