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• W2474727706 abstract "Research suggests that including an 8 h rest period between exercise/loading sessions optimizes the osteogenic index (OI), resulting in augmented bone mineral density (BMD). Further, using a novel peripheral quantitative computed tomography (pQCT) sector analysis potentially allows for the detection of early site-specific bone adaptations. PURPOSE: To test the hypothesis that performing ballistic, plyometric-type exercise twice (2x/d) vs. once (1x/d) per day (equating for total exercise time/volume) would result in augmented pQCT-assessed bone adaptations. METHODS: Men and women volunteers (n=17; 23.4 ± 4.6 y) were randomized into 1x/d (n=11) or 2x/d (n=6) training groups and completed non-linear periodized training on a 3PQ leg press machine 3 d/wk for 11 wk. The 2x/d exercise sessions were separated by 8 h, leading to a 45% greater OI vs. 1x/d. Tibial pQCT scans taken at 38% and 66% from the distal end plate were analyzed using MATLAB to assess whole bone and regional (six, 60° polar sectors: LA, AA, MA, MP, PP, LP; L=lateral, A=anterior, M=medial, P=posterior) parameters including volumetric BMD (vBMD), cortical area and thickness. Data were analyzed with repeated measures ANOVA. RESULTS: Following training, there were no changes in whole bone cortical vBMD at the 38% site; however, regional analysis revealed an increase in the LP sector (P=0.03) in both groups. Whole bone cortical area at 38% did not change in 1x/d, but increased in the 2x/d group (p<0.01). Sector analysis of cortical area at the 38% site demonstrated similar adaptations, where area was preserved (PP; P=0.22) or increased (AA; P=0.03) in 2x/d, but decreased (PP; p<0.01) or remained the same (AA, LP; p>0.10 for both) in the 1x/d group. Whole bone cortical thickness at the 38% site tended to decrease (P=0.07) in 1x/d, but was preserved (P=0.15) in the 2x/d group. Regional analysis revealed that cortical thickness decreased in AA (P=0.04) and PP (P=0.01) sectors in 1x/d, but was increased (AA; p<0.01) or preserved (PP; P=0.23) in the 2x/d group. No changes were observed at the 66% site for any parameter assessed. CONCLUSION: Optimizing the osteogenic potential of exercise enhances site-specific bone changes that can be observed in as little as 3 months by exploiting pQCT sector analysis. Not to be construed as official Department of the Army position or policy." @default.
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• W2474727706 date "2016-05-01" @default.
• W2474727706 modified "2023-09-28" @default.
• W2474727706 title "Peripheral QCT Sector Analysis Reveals Positive Bone Adaptations Following Osteogenic Index-Optimized Exercise" @default.
• W2474727706 doi "https://doi.org/10.1249/01.mss.0000487409.15346.69" @default.
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