The Association of Obesity With Quadriceps Activation During Sit-to-Stand.
Objective Obesity reduces voluntary recruitment of quadriceps during single-joint exercises, but the effects of obesity on quadriceps femoris muscle activation during dynamic daily living tasks, such as sit-to-stand (STS), are largely unknown. The purpose of this study was to determine how obesity a...
| Publicado en: | Physical Therapy Vol. 100; no. 12; pp. 2134 - 2144 |
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| Autores principales: | , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Oxford University Press / USA
Dec2020
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=147531329&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 147531329 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00319023 PTH jtl: Physical Therapy issn: 00319023 maglogo: N pubinfo: dt: Dec2020 vid: 100 iid: 12 pid: 10398 pub: Oxford University Press / USA artinfo: ui: 147531329 147531329 147531329 10.1093/ptj/pzaa170 147531329 ppf: 2134 ppct: 10 formats: tig: atl: The Association of Obesity With Quadriceps Activation During Sit-to-Stand. aug: au: Bollinger, Lance M Ransom, Amanda L affil: Department of Kinesiology and Health Promotion, University of Kentucky, 201 Seaton Bldg , Lexington, KY 40506 (USA); and Center for Muscle Biology, University of Kentucky sug: subj: Obesity Quadriceps Muscles Physiology Muscle Contraction Physiology Rising Task Performance and Analysis Women's Health Human Cross Sectional Studies Motion Analysis Systems Electromyography Vastus Medialis Muscles Physiology Isometric Contraction Muscle Strength Female Adult Middle Age Descriptive Statistics Data Analysis Software T-Tests Lower Extremity Funding Source Adult: 19-44 years Middle Aged: 45-64 years Female ab: Objective Obesity reduces voluntary recruitment of quadriceps during single-joint exercises, but the effects of obesity on quadriceps femoris muscle activation during dynamic daily living tasks, such as sit-to-stand (STS), are largely unknown. The purpose of this study was to determine how obesity affects quadriceps muscle recruitment during STS. Methods In this cross-sectional study, 10 women who were lean and 17 women who were obese completed STS from a chair with arms crossed over the chest. Three-dimensional motion analysis was used to define 3 distinct phases (I–III) of the STS cycle. The electromyographic (EMG) activity of the vastus medialis, vastus lateralis, and semitendinosus was measured. Results STS duration was greater (3.02 [SD = 0.75] seconds vs 1.67 [SD = 0.28] seconds) and peak trunk flexion angle was lower (28.9 degrees [SD = 10.4 degrees] vs 35.8 degrees [SD = 10.1 degrees]) in the women who were obese than in the women who were lean. The mean EMG activity of the knee extensors increased from phase I to phase II in both groups; however, the mean EMG activities of both the vastus medialis (32.1% [SD = 16.6%] vs 47.3% [SD = 19.6%] maximal voluntary isometric contraction) and the vastus lateralis (31.8% [SD = 19.4%] vs 47.5% [SD = 19.6%] maximal voluntary isometric contraction) were significantly lower during phase II in the women who were obese. The mean EMG activity of the semitendinosus increased throughout STS but was not significantly different between the 2 groups. Coactivation of the semitendinosus and knee extensors tended to be greater in the women who were obese but failed to reach statistical significance. Conclusions Knee extensor EMG amplitude was reduced in women who were obese during STS, despite reduced trunk flexion. Impact Reduced knee extensor recruitment during STS in obesity may redistribute forces needed to complete this task to other joints. Functional movement training may help improve knee extensor recruitment during STS in people who are obese. Lay Summary People with obesity often have low quadriceps muscle strength and impaired mobility during daily activities. This study shows that women who are obese have lower voluntary recruitment of quadriceps when rising from a chair than women who are lean do, which could increase workload on hip or ankle muscles during this important daily task. Quadriceps strengthening exercises might improve the ability to rise from sitting to standing. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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