This study aimed to investigate the effect of lower limb exercise on electroencephalogram (EEG) activity and posture stability during whole body vibration (WBV) for healthy elderly people. Subjects were composed of 20 elderly people who were over 60 years old and had no disease. They were subjected to WBV of 30Hz and strength intensity of 20 (total 5 sets, 20s/set, rest time: 20s, except for the final set). The subjects were grouped into two groups. One group of 11 subjects was WBVSt (WBV of upright stance) and the other group of nine subjects was WBVSq (WBV of squat posture). In the WBVSt group, the subjects were requested to maintain a standing position, whereas those in the WBVSq group were asked to perform 60^∘-knee flexion squat at 2s intervals during WBV stimulation. In this study, the electromyography (EMG) was measured on the right and left erector spinae, rectus femoris, vastus lateralis, vastus medialis, tibialis anterior to evaluate lower limb muscle activity and postural stability during timed up and go (TUG) test before and after WBV. The EEG was measured on frontal (F3, F4, F7, F8), central (Cz, C3, C4), temporal (T3, T4, T5, T6), parietal (P3, P4), and occipital (O1, O2) lobes to evaluate brain activity during the check of mini-mental state examination for dementia screening (MMSE-DS) before and after WBV. The results of this study showed improved postural stability and muscle activation for the healthy elderly during lower limb and WVB exercises. The WBVSq group showed higher changes in TUG-test (p<0.05) and iEMG analysis by EMG (p>0.05) compared with the WBVSt group. However, there was no significant change in MMSE-DS (p>0.05). Because of the increase in relative SMR power by EEG, the central (C4), frontal (F7) and parietal (P3, P4) lobes were activated in WBVSt group (p<0.05); however, all regions, except the parietal lobe, were activated in WBVSq group (p>0.05). Lower limb exercise with WBV stimulation improved postural stability, lower limb muscle, and brain activation for the elderly. These results may be helpful to the protocol of exercise using WBV for the healthy elderly.

中文翻译：

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老年人全身振动时下肢锻炼对体位稳定性和大脑活动的影响

本研究旨在探讨下肢运动对健康老年人全身振动（WBV）期间脑电图（EEG）活动和姿势稳定性的影响。受试者由 20 名 60 岁以上且无疾病的老年人组成。他们受到了30的WBVHz和强度强度20（共5组，20秒/组，休息时间：20s，除了最后一组）。受试者被分成两组。一组 11 名受试者是 WBVSt（直立姿势的 WBV），另一组 9 名受试者是 WBVSq（下蹲姿势的 WBV）。^{WBVSt 组要求受试者保持站立姿势，而WBVSq}组要求受试者在 2 分钟时进行 60 ∘ 膝屈曲深蹲。WBV 刺激期间的 s 间隔。在这项研究中，测量了左右竖脊肌、股直肌、股外侧肌、股内侧肌、胫骨前肌的肌电图 (EMG)，以评估在 Timed Up and Go (TUG) 测试之前和之前的下肢肌肉活动和姿势稳定性。 WBV 后。脑电图在额叶（F3、F4、F7、F8）、中央（Cz、C3、C4）、颞叶（T3、T4、T5、T6）、顶叶（P3、P4）和枕叶（O1、O2）进行测量在 WBV 之前和之后进行痴呆筛查 (MMSE-DS) 的小型精神状态检查期间评估大脑活动。这项研究的结果表明，健康老年人在下肢和 WVB 锻炼期间姿势稳定性和肌肉激活得到改善。WBVSq 组在 TUG 测试中表现出更高的变化（p<0.05) 和 EMG 的 iEMG 分析 (p>0.05) 与 WBVSt 组相比。然而，MMSE-DS 没有显着变化（p>0.05）。由于 EEG 相对 SMR 功率的增加，WBVSt 组的中央（C4）、额叶（F7）和顶叶（P3、P4）被激活。p<0.05); 然而，在 WBVSq 组中，除顶叶外的所有区域都被激活（p>0.05）。WBV 刺激下肢锻炼改善了老年人的姿势稳定性、下肢肌肉和大脑激活。这些结果可能有助于健康老年人使用 WBV 的运动方案。