AbstractBackgroundTo examine the effect of exercise modality during weight loss on hip and spine bone mineral density (BMD) in overweight and obese, older adults.MethodsThis analysis compared data from two 5-month, randomized controlled trials of caloric restriction (CR; inducing 5–10% weight loss) with either resistance training (RT) or aerobic training (AT) in overweight and obese, older adults. Participants in the RT + CR study underwent 3 days/week of 8 upper/lower body exercises (3 sets, 10 repetitions at 70% 1 RM) and participants in the AT+CR study underwent 4 days/week of treadmill walking (30 min at 65–70% heart rate reserve). BMD at the total hip, femoral neck, and lumbar spine was assessed via dual-energy X-ray absorptiometry at baseline and 5 months.ResultsA total of 123 adults (69.4 ± 3.5 years, 67% female, 81% Caucasian) participated in the RT+CR (n = 60) and AT+CR (n = 63) interventions. Average weight loss was 5.7% (95% CI: 4.6–6.7%) and 8.2% (95% CI: 7.2–9.3%) in RT+CR and AT+CR groups, respectively. After adjustment for age, gender, race, baseline BMI and BMD, and weight change, differential treatment effects were observed for total hip and femoral neck (both p < .05), but not lumbar spine. Total hip (1.83 [−3.90, 7.55] mg/cm2) and femoral neck (9.14 [−0.70, 18.98] mg/cm2) BMD was unchanged in RT+CR participants, and modestly decreased in AT+CR participants (total hip: −7.01 [−12.73, −1.29] mg/cm2; femoral neck: −5.36 [−14.92, 4.20] mg/cm2).ConclusionsResults suggest performing resistance, rather than aerobic, training during CR may attenuate loss of hip and femoral neck BMD in overweight and obese older adults. Findings warrant replication from a long-term, adequately powered, RCT.
The Journals of Gerontology Series A: Biomedical Sciences and Medical Sciences – Oxford University Press
Published: Oct 12, 2017
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