Muscle Co-Activation Across Activities of Daily Living in Individuals With Knee Osteoarthritis

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Smith, SL
Allan, R
Marreiros, SP
Woodburn, J
Steultjens, MPM
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2019
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Abstract

Objective: Muscle co-activation has been shown to be elevated in individuals with knee osteoarthritis (OA) during gait. Comparisons of muscle co-activation across different activities of daily living such as stair negotiation have yet to be explored. The aim of this study was to explore muscle co-activation across different activities of daily living in patients with knee OA. Methods: Muscle co-activation was assessed in 77 symptomatic knee OA patients (mean ± SD age 62.5 ± 8.1 years, body mass index 29.4 ± 6.0 kg/m 2 , and sex 48:29 female:male) using electromyography (EMG), during a series of walking, stair negotiation (ascent, descent), and sit-to-walk activities. EMG was recorded from 7 sites, mediolateral gastrocnemius, biceps femoris, semitendinosus, vastus lateralis/medialis, and rectus femoris, and normalized to maximal voluntary isometric contraction. Correlation was used to assess the consistency of co-activation across activities. Repeated-measures analysis of variance assessed the muscle combination by activity differences. Results: Muscle co-activation was highest during stair ascent. When comparing muscle combinations within the same activity, we found that correlations ranged from r = 0.003 to r = 0.897, of which 80% of the combinations were significant. Between activities, muscle co-activation was significantly different (P < 0.05). Mediolateral muscle co-activation was higher than hamstrings/quadriceps across activities. Conclusion: Two muscle co-activation strategies were observed during activities of daily living in patients with knee OA to maintain stability. Muscle co-activation was higher during more challenging activities, particularly when the joint was accepting load. Mediolateral muscle co-activation was higher than hamstrings/quadriceps, so that mediolateral co-activation was thought to be a stabilization mechanism, while hamstrings/quadriceps co-activation responds to knee flexion moments, suggesting that different muscle combinations may have different roles in responding to joint demand.

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Arthritis Care and Research

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71

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5

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© 2018, American College of Rheumatology. This is the peer reviewed version of the following article: Muscle Co-Activation Across Activities of Daily Living in Individuals With Knee Osteoarthritis, Arthritis Care and Research, 2019, 71 (5), pp. 651-660, which has been published in final form at https://doi.org/10.1002/acr.23688. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-828039.html)

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Clinical sciences

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Smith, SL; Allan, R; Marreiros, SP; Woodburn, J; Steultjens, MPM, Muscle Co-Activation Across Activities of Daily Living in Individuals With Knee Osteoarthritis, Arthritis Care and Research, 2019, 71 (5), pp. 651-660

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