{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,24]],"date-time":"2026-10-24T01:23:17Z","timestamp":1792804997093,"version":"4.5.0"},"reference-count":29,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2021,11,13]],"date-time":"2021-11-13T00:00:00Z","timestamp":1636761600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Taichung Hospital, Ministry of Health and Welfare, Taiwan","award":["No. 9914"],"award-info":[{"award-number":["No. 9914"]}],"id":[{"id":"https:\/\/ror.org\/024w0ge69","id-type":"ROR","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>In recent years, whole-body vibration (WBV) training has been used as a training method in health promotion. This study attempted to use WBV at three different frequencies (20, 30, and 40 Hz) with subjects from different age groups to analyze the activation of the rectus femoris muscle. The subjects included 47 females and 51 males with an average age of 45.1 \u00b1 15.2 years. Results indicated significant differences in subjects from different age groups at 20 Hz WBV. Muscle contraction was greater in the subjects who were older (F(4,93) = 82.448, p &lt; 0.001). However, at 30 Hz WBV, the difference was not significant (F(4,93) = 2.373, p = 0.058). At 40 Hz WBV, muscle contraction was less in the older subjects than in the younger subjects (F(4,93) = 18.025, p &lt; 0.001). The spectrum analysis also indicated that at 40 Hz there was less muscle activity during WBV in the older subjects than in the younger ones. Therefore, age was found to have a significant effect on muscle activation during WBV at different frequencies. If the training is offered to elderly subjects, their neuromuscular responses to 20 Hz WBV will be more suitable than to 40 Hz WBV.<\/jats:p>","DOI":"10.3390\/ijerph182211942","type":"journal-article","created":{"date-parts":[[2021,11,14]],"date-time":"2021-11-14T20:48:36Z","timestamp":1636922916000},"page":"11942","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Is 20 Hz Whole-Body Vibration Training Better for Older Individuals than 40 Hz?"],"prefix":"10.3390","volume":"18","author":[{"given":"Shiuan-Yu","family":"Tseng","sequence":"first","affiliation":[{"name":"Graduate Institute of Service Industries and Management, Minghsin University of Science and Technology, Hsinchu 30401, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chung-Po","family":"Ko","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Tungs\u2019 Taichung MetroHarbor Hospital, Taichung 43503, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chin-Yen","family":"Tseng","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy, Upright Come Scoliosis Clinic, Hsinchu 30286, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei-Ching","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Physical Medicine and Rehabilitation, Taichung Hospital, Ministry of Health and Welfare, Taichung 40343, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7562-6054","authenticated-orcid":false,"given":"Chung-Liang","family":"Lai","sequence":"additional","affiliation":[{"name":"Department of Occupational Therapy, College of Medical and Health Science, Asia University, Taichung 41354, Taiwan"},{"name":"Department of Physical Medicine and Rehabilitation, Puzi Hospital, Ministry of Health and Welfare, Chiayi County 61347, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5164-9801","authenticated-orcid":false,"given":"Chun-Hou","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy, Chung Shan Medical University, Taichung 40201, Taiwan"},{"name":"Physical Therapy Room, Chung Shan Medical University Hospital, Taichung 40201, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,11,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"571","DOI":"10.3233\/WOR-182699","article-title":"Effect of whole-body vibration on neuromuscular performance: A literature review","volume":"59","author":"Alam","year":"2018","journal-title":"Work"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"815","DOI":"10.1016\/j.apmr.2007.09.055","article-title":"A Comparison of the Physiologic Effects of Acute Whole-Body Vibration Exercise in Young and Older People","volume":"89","author":"Cochrane","year":"2008","journal-title":"Arch. 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