Soroosh Sadeh , Keng-Hung Shen , Forouzan Foroughi , Mark W. Rogers , Hao-Yuan Hsiao
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引用次数: 0
Abstract
Falls are a significant health risk in older adults, and forward and backward falls each account for more than 40 % of falls. Dynamic stability, limb support, and impact energy absorption are crucial balance regulatory components and likely vary with the direction of imbalance. Understanding how perturbation direction influences these key components of balance stability regulation is crucial. This study investigated the balance stability, lower limb impact energy absorption, and limb support in forward and backward directions of balance perturbations in younger versus older adults.
Thirteen healthy old and thirteen healthy young adults participated in this study. Participants stood on two adjacent perturbation platforms in modified tandem stance. The leading or trailing limb support surface dropped 76.2 mm vertically at an unknown time to impose body shift. Two-way (direction X group) mixed ANOVA was performed to analyze the anterior margin of stability (MoS), trunk angular displacement, peak negative power at the hip, knee, and ankle, and the peak vertical ground reaction forces (VGRF).
Compared to forward perturbation, backward perturbation induced greater MoS (P < 0.01), peak VGRF (P < 0.01), and peak ankle (P < 0.05) and hip (P < 0.05) joint power. Older adults showed decreased MoS (P < 0.05), perturbed limb peak VGRF (P < 0.05), and ankle (P < 0.05) and knee (P < 0.05) joint peak power compared to younger adults.
Forward perturbations induced greater challenges for dynamic stability, possibly due to trunk motion characteristics, while backward perturbations posed challenges in limb support and impact energy absorption. In addition, age-related deficits in balance stability regulation were observed in both perturbation directions.
期刊介绍：
Human Movement Science provides a medium for publishing disciplinary and multidisciplinary studies on human movement. It brings together psychological, biomechanical and neurophysiological research on the control, organization and learning of human movement, including the perceptual support of movement. The overarching goal of the journal is to publish articles that help advance theoretical understanding of the control and organization of human movement, as well as changes therein as a function of development, learning and rehabilitation. The nature of the research reported may vary from fundamental theoretical or empirical studies to more applied studies in the fields of, for example, sport, dance and rehabilitation with the proviso that all studies have a distinct theoretical bearing. Also, reviews and meta-studies advancing the understanding of human movement are welcome.
These aims and scope imply that purely descriptive studies are not acceptable, while methodological articles are only acceptable if the methodology in question opens up new vistas in understanding the control and organization of human movement. The same holds for articles on exercise physiology, which in general are not supported, unless they speak to the control and organization of human movement. In general, it is required that the theoretical message of articles published in Human Movement Science is, to a certain extent, innovative and not dismissible as just "more of the same."
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