Objectives: Physical exercise has been shown to benefit diverse medical and behavioral conditions. This study assesses the feasibility and efficacy of an 8-week endurance and resistance training program on fitness measures in individuals undergoing residential treatment for methamphetamine (MA) dependence.
Methods: A total of 39 MA-dependent individuals were randomized to 3 days/week of exercise training (ET, n = 15) or health education without training (equal attention [EA], n = 14) over 8 weeks. Aerobic performance (
O2max) was measured by indirect calorimetry, body composition by skinfolds, muscle strength by 1-repetition maximum (1-RM), and endurance at 85% of 1-RM for both leg press (LP) and chest press (CP).
Results: A total of 29 individuals completed the study for a 74% adherence rate. Baseline characteristics (mean ± SD) were balanced between groups: age 31 ± 7 years; height = 1.74 ± 0.07 m; weight 82.0 ± 15.0 kg. The ET group significantly improved
O2max by 0.63 ± 0.22 L/min (+21%), LP strength by 24.4 ± 5.6 kg (+40%), and CP strength by 20.6 ± 5.7 kg (+49%). The ET group increased LP and CP endurance by 120% and 96%, respectively and showed significant reductions in body weight of 1.7 ± 2.4 kg (−2%), % body fat of 2.8 ± 1.3% (−15%), and fat weight 2.8 ± 1.8 kg (−18%). All changes were significant (P < 0.001) for ET, and no changes were seen for the EA group.
Conclusions: Individuals recovering from MA dependence showed substantial improvements in aerobic exercise performance, muscle strength and endurance, and body composition with ET. These findings demonstrate the feasibility of an ET intervention in these participants and also show excellent responsiveness to the exercise stimulus resulting in physiological changes that might enhance recovery from drug dependency.
From the Exercise Physiology Research Laboratory (BAD, TWS, MA, and CBC), David Geffen School of Medicine, University of California, Los Angeles, Integrated Substance Abuse Programs (BAD, JC, JP, LM, DD, and RAR), Semel Institute, David Geffen School of Medicine, University of California, Los Angeles.
Send correspondence and reprint requests to Brett A. Dolezal, PhD, Exercise Physiology Research Laboratory, Department of Medicine, David Geffen School of Medicine, 10833 Le Conte 37–131 CHS, University of California, Los Angeles, Los Angeles, CA 90095. E-mail: email@example.com
Funded by NIH/NIDA grant R01 DA027633 to Dr Richard A. Rawson.
Dr. Christopher Cooper has acted as a consultant to Carefusion, whose OxyCon Mobile was used for the exercise testing. For the remaining authors, no conflicts of interest were declared.
Received July 12, 2012
Accepted December 10, 2012