The purpose of this study was to compare the effects of two weight training protocols, high load (80% 1RM 8 reps) and high repetition (40% 1RM 16 reps), on bone mineral density (BMD) in early postmenopausal women. The two 6 month programs were matched for training volume (3 sets, 3 days/week) for 12 exercises selected to specifically load the spine and hip. Subjects included 25 estrogen deficient women, 41 to 61 years of age, who were matched by spine BMD then randomly assigned to either the high load (HL n=10), high rep (HR n=7) or control (C n=8) groups. Dietary calcium intakes were supplemented to≈ 1500 mg/day. BMD was measured at the lumbar spine (L2-L4), hip (neck, trochanter, Ward's ▵, shaft, total) and the total body using Dual Energy X-Ray Absorptiometry (DEXA, Lunar Model DPX-IQ). Serum osteocalcin concentrations were assayed in duplicate using RIA kits. There were no group differences in the baseline measures. Generally, the slight changes (≈1%) in BMD were within the measurement error of the instrument. Two way ANOVA determined no significant group, trial, or group X trial effects for any of the BMD variables or osteocalcin. The lack of significant changes in the BMD sites for C suggest the increased calcium intake may have reduced the rate of bone loss. In conclusion, neither of the 6 month resistance training protocols had a positive effect on BMD in early postmenopausal women.
American College of Sports Medicine 45th Annual Meeting; June 3-6, 1998; Orange County Convention Center; Orlando, Florida
G-35 FREE COMMUNICATION/POSTER PRESENTATION BONE DENSITY