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<p>Excessive adiposity may alter dynamic postural control during functional tasks, but its influence on direction-specific acceleration during unilateral sit-to-stand transitions remains insufficiently understood. This study aims to examine the association between percent body fat and smartphone-derived direction-specific acceleration variables during the single-leg sit-to-stand test (SLSTST) in young adult females. Sixty young adult females, categorized by percent body fat as normal fat, overfat, and severe fat groups (<i>n</i> = 20 per group), performed the five-times SLSTST using the dominant leg. A smartphone positioned at the S2 level recorded linear acceleration in the mediolateral (ML), vertical (VT), and anteroposterior (AP) directions. Smartphone-derived acceleration variables were reported in cm/s², and task completion time was reported in seconds. Group differences were examined using one-way ANOVA with Bonferroni-adjusted post-hoc comparisons. The severe fat group exhibited greater direction-specific acceleration than the normal fat group, including posterior AP acceleration (-20.93 vs. -11.31&#xa0;cm/s²), ML acceleration (5.85 vs. 1.38&#xa0;cm/s²), and downward VT acceleration (-13.09 vs. -6.15&#xa0;cm/s²). Task completion time was also longer in the severe fat group than in the normal fat group (18.21 vs. 11.72&#xa0;s; <i>p</i> &lt; 0.001). Total acceleration did not differ significantly among groups (<i>p</i> = 0.096). Severe adiposity was associated with altered direction-specific acceleration behavior and slower SLSTST performance. These findings suggest increased mechanical demand for dynamic postural control during unilateral functional transitions. Smartphone-based accelerometry may provide a feasible approach for detecting movement-control alterations, although future studies incorporating force plates, motion capture, electromyography, and segmental body composition assessment are required to confirm the underlying mechanisms.</p>

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Biomechanical constraints of excessive adiposity on smartphone-derived directional acceleration and dynamic balance during unilateral sit-to-stand transitions in young adults

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月6日

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  • Suttiwat Jeamtrakool,
  • Weerasak Tapanya,
  • Noppharath Sangkarit,
  • Jittraphorn Wongphoek,
  • Manus Chotjaroenrat

摘要

Excessive adiposity may alter dynamic postural control during functional tasks, but its influence on direction-specific acceleration during unilateral sit-to-stand transitions remains insufficiently understood. This study aims to examine the association between percent body fat and smartphone-derived direction-specific acceleration variables during the single-leg sit-to-stand test (SLSTST) in young adult females. Sixty young adult females, categorized by percent body fat as normal fat, overfat, and severe fat groups (n = 20 per group), performed the five-times SLSTST using the dominant leg. A smartphone positioned at the S2 level recorded linear acceleration in the mediolateral (ML), vertical (VT), and anteroposterior (AP) directions. Smartphone-derived acceleration variables were reported in cm/s², and task completion time was reported in seconds. Group differences were examined using one-way ANOVA with Bonferroni-adjusted post-hoc comparisons. The severe fat group exhibited greater direction-specific acceleration than the normal fat group, including posterior AP acceleration (-20.93 vs. -11.31 cm/s²), ML acceleration (5.85 vs. 1.38 cm/s²), and downward VT acceleration (-13.09 vs. -6.15 cm/s²). Task completion time was also longer in the severe fat group than in the normal fat group (18.21 vs. 11.72 s; p < 0.001). Total acceleration did not differ significantly among groups (p = 0.096). Severe adiposity was associated with altered direction-specific acceleration behavior and slower SLSTST performance. These findings suggest increased mechanical demand for dynamic postural control during unilateral functional transitions. Smartphone-based accelerometry may provide a feasible approach for detecting movement-control alterations, although future studies incorporating force plates, motion capture, electromyography, and segmental body composition assessment are required to confirm the underlying mechanisms.