Background Whole-body vibration (WBV) exercise is widely used for training and rehabilitation. However, the optimal posture for training both the upper and lower extremities simultaneously remains to be established. Objectives The objective of this study was to search for an effective posture to conduct vibration from the lower to the upper extremities while performing WBV exercises without any adverse effects. Methods Twelve healthy volunteers (age: 22–34 years) were enrolled in the study. To measure the magnitude of vibration, four accelerometers were attached to the upper arm, back, thigh, and calf of each subject. Vibrations were produced using a WBV platform (Galileo 900) with an amplitude of 4 mm at two frequencies, 15 and 30 Hz. The following three postures were examined: posture A, standing posture with the knees flexed at 30°; posture B, crouching position with no direct contact between the knees and elbows; and posture C, crouching position with direct contact between the knees and elbows. The ratio of the magnitude of vibration at the thigh, back, and upper arm relative to that at the calf was used as an index of vibration conduction. Results Posture B was associated with a greater magnitude of vibration to the calf than posture A at 15 Hz, and postures B and C were associated with greater magnitudes of vibration than posture A at 30 Hz. Posture C was associated with a vibration conduction to the upper arm that was 4.62 times and 8.26 times greater than that for posture A at 15 and 30 Hz, respectively. Conclusion This study revealed that a crouching position on a WBV platform with direct contact between the knees and elbows was effective for conducting vibration from the lower to the upper extremities.

中文翻译：

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在全身振动锻炼中，从下肢到上肢进行振动的最有效姿势是什么？

背景技术全身振动（WBV）锻炼被广泛用于培训和康复。但是，同时训练上肢和下肢的最佳姿势仍有待建立。目的本研究的目的是寻找一种有效的姿势，以在进行WBV锻炼时从下肢到上肢进行振动，而不会产生任何不良影响。方法招募了十二名健康志愿者（年龄在22-34岁之间）。为了测量振动的大小，将四个加速度计连接到每个对象的上臂，背部，大腿和小腿上。使用WBV平台（伽利略900）以15和30 Hz的两个频率振幅为4 mm产生振动。检查以下三个姿势：姿势A，膝盖弯曲30°的站立姿势；姿势B 蹲伏位置，膝盖和肘部之间没有直接接触；姿势C，蹲伏位置，膝盖和肘部直接接触。大腿，后背和上臂处的振动幅度与小腿处的振动幅度之比用作振动传导的指标。结果在15 Hz时，姿势B与小腿的振动有关，而在30 Hz时，姿势B与C的振动有关。姿势C与上臂的振动传导相关，在15 Hz和30 Hz时分别比姿势A的振动传导大4.62倍和8.26倍。