METHODS: Fifty-seven males and females (mean±SD; age=66.5±7.09 yrs; height=165.2±10.6 cm; body mass=74.5±14.6 kg) volunteered to participate in this study. Participants underwent a total body dual-energy x-ray absorptiometry (DXA) scan for segmental and total body bone mineral content (BMC) and bone mineral density (BMD). Participants were block randomized into one of three groups: elastic band resistance training (EBRT; n=24), dumbbell resistance training (DBRT; n=21), or control (CON; n=12). EBRT and DBRT were asked to visit the laboratory twice weekly over 6-weeks while CON maintained their daily routine. Three-day dietary recalls were collected to ensure dietary maintenance throughout the intervention period. Data were analyzed using a two-way (time x treatment) repeated measures ANOVA and an alpha pre-determined at 0.05. RESULTS: Results indicated there was no two-way interaction for total body BMC (p=0.164) nor was there a main effect for time (p=0.39) or group (p=0.40). Likewise, total body BMD indicated no 2-way interaction (p=0.79) and no main effect for time (p=0.753). However, there was a main effect for group where collapsed across time, DBRT had a higher BMD than CON (p=0.05), but no other differences were observed. CONCLUSIONS: These data suggest that either the load provided throughout the training from DBRT and EBRT to stimulate change in bone over 6-weeks was insufficient or the duration was not long enough. Most previous research supports the latter as bone remodeling occurs in a throughout 4-8 month periods. Other factors that may impact the outcome of the stimuli include exogenous pharmacological treatment for bone loss and dietary factors.
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