The piezoelectric properties of bone play an important role in the bone remodeling process and can be employed in clinical bone repair. In this study, the piezo-voltage of bone between two surfaces of a bone beam under bending deformation was measured using an ultra-high-input impedance bioamplifier. The influence of shear stress on the signs of piezo-voltages in bone was determined by comparing and contrasting the results from three-point and four-point bending experiments. From the three-point bending experiment, the study found that the signs of piezo-voltages depend only on shear stress and are not sensitive to the normal stress.
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Influence of Shear Stress on Behaviors of Piezoelectric Voltages in Bone
Donghui Fu, Zhende Hou, Qing-Hua Qin, Lianyun Xu, and Yanjun Zeng
Effects of Physical Activity Interventions on Physical Self-Perception in College Students: A Systematic Review and Meta-Analysis
Zhiling Yang, Zhiying Yang, Wengling Ou, Qing Zeng, and Jiafu Huang
Background: Although the physical activities have demonstrated efficacy in improving physical self-perception, the findings of available studies in college students were conflicting. This review aimed to examine the effects of physical activity interventions on physical self-perception in college students. Methods: Web of Science, PubMed, Cochrane Library, EBSCOhost, Embase, Scopus, CNKI, WanFang, and Chinese Technical Periodicals were searched from inception to April 2024. Studies were included if they were randomized controlled trials (RCTs) or non-RCTs (non-RCTs) that examined the effects of physical activity interventions on college students’ physical self-perception. Random-effects models were used in meta-analyses to synthesize effect sizes. Results: Forty studies (17 RCTs and 23 non-RCTs) with 4955 participants were included in this meta-analysis. Overall, physical activity interventions had small to moderate significant effect on physical self-worth (standardized mean difference [SMD] = 0.44, P < .00001), perceived sports competence (SMD = 0.60, P < .00001), perceived physical condition (SMD = 0.45, P < .00001), perceived physical strength (SMD = 0.53, P < .00001), and perceived body attractiveness (SMD = 0.54, P < .00001). Significant differences were observed in study design (P = .031–.039), intervention type (P = .003–.031), and intervention duration (P = .002–.036) for some aspects of physical self-perception, such as perceived physical strength and perceived body attractiveness. Conclusions: Physical activity interventions have beneficial effects on physical self-perception in college students, especially those conducted for 12 weeks, 3 times or more per week, lasting 90 minutes or more per session. Large, high-quality RCTs are required to further confirm these findings.
