Deaprtment of Public Health and Preventive Medicine, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan.
Department of Physical Therapy, Kyushu Nutrition Welfare University, Kitakyushu, Fukuoka 800-0298, Japan.
Int J Environ Res Public Health. 2020 Feb 7;17(3):1069. doi: 10.3390/ijerph17031069.
Non-invasive application of whole-body vibration (WBV) has the potential for inducing improvements in impaired peripheral circulation, cutaneous sensation and balance among older adults. However, relevant studies have frequently applied high magnitudes of vibration and show conflicting and inconclusive results. Therefore, we attempted to ascertain the acute responses in those parameters from exposure of thirty older subjects to WBV of three different magnitudes, defined according to ISO 2631-1 (1997).
Each subject randomly underwent four sessions of intervention (three bouts of 1 min exposure with 1 min between-bout rests): WBV at 15, 20, or 25 Hz with a peak-to-peak displacement of 4 mm, or control condition.
Both during and after intervention, dorsal foot skin blood flow increased significantly under 20 and 25 Hz exposure conditions with greater responses under the latter condition, the magnitude of which slightly exceeded the recommended value. Plantar vibrotactile perception showed significant increases after WBV exposure with overall greater responses under higher frequencies of vibration. In contrast, no WBV-induced change in balance was observed.
WBV at 20 Hz with a magnitude within the recommended limit can be effective in inducing enhancements in peripheral blood flow; however, the same magnitude of vibration seems insufficient in improving balance among older adults.
全身振动（WBV）的无创应用有可能改善老年人受损的周围循环、皮肤感觉和平衡能力。然而，相关研究经常应用高幅度的振动，结果相互矛盾且没有定论。因此，我们试图确定 30 名老年人在接触 ISO 2631-1（1997）定义的三种不同幅度的 WBV 时，这些参数的急性反应。
每个受试者随机接受四次干预（三次 1 分钟暴露，每次之间休息 1 分钟）：20、25 Hz 振动，峰值到峰值位移为 4mm，或对照条件。
在干预过程中和干预后，20 和 25 Hz 暴露条件下的脚背皮肤血流均显著增加，后者的反应更大，其幅度略高于推荐值。足底振动触觉感知在 WBV 暴露后显著增加，整体上在更高频率的振动下反应更大。相反，平衡没有观察到 WBV 诱导的变化。
20 Hz 的 WBV 幅度在推荐范围内可能有效促进外周血流量的增加；然而，对于改善老年人的平衡能力，相同幅度的振动似乎还不够。
