Therefore, PF-01367338 in vivo in our cohort, sporting activity may have played a substantially larger role in the determination of cortical bone parameters when compared to muscle strength, suggesting that impact loading is a stronger

predictor of cortical parameters, while muscle strength may be a stronger predictor of trabecular outcomes (e.g. Tb.BMD, Tb.Th — trabecular bone mineral density and trabecular thickness, respectively). Both muscle strength and sporting activity were significant predictors of failure load at the distal tibia in the female cohort, but muscle strength accounted for approximately 13% more of the variance in failure load than sporting activity. When investigating the distal tibia of the male cohort, sporting activity accounted for 30% of the variance in failure load, while muscle strength accounted for none. These

seemingly opposite results may have arisen due to sex differences in the variability of muscle strength parameters. Specifically, the variability in knee extension torque was substantially higher in men than women, which NSC 683864 cell line may have influenced our ability to detect a relationship between muscle strength and bone quality in men. This data is in contrast with Nikander et al. [3] who showed that loading modality, but not muscle power or muscle strength, was a predictor of bone strength index at the distal tibia in female athletes (male athletes were not investigated). A possible explanation for the discrepancy is that the bone strength index used by Nikander et al. (density-weighted polar section modulus) is an indicator of bone’s resistance to torsion and bending, while the failure load that we estimated is purely a compressive property. Thus, it is difficult to directly compare the results of the two studies. As stated previously, our results generally indicate that sporting activity involving impact loading is associated with augmented bone quality in both female and male athletes. One single, but perhaps major discrepancy found

in this study was that of female swimmers having significantly higher Ct.BMD at the distal tibia than soccer players after adjusting Resveratrol for age, height, and body mass. We observed a similar trend in males, but the difference across groups was not statistically significant. This finding may suggest that the lack of impact loading in swimming is associated with lower intracortical remodeling, which agrees with previous work [12] and [56] that showed both young and old female athletes have lower Ct.BMD at the tibial shaft than non-athletic controls. Furthermore, Rantalainen et al. [56] showed the trend that young high-impact and odd-impact female athletes exhibit lower Ct.BMD by pQCT than swimmers (not statistically significant), and Ct.BMD of swimmers is not different from controls.