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Article type: Research Article
Authors: Baik, Seung-Mina; b | Cynn, Heon-Seocka; c; * | Yi, Chung-Hwic | Lee, Ji-Hyunb | Choi, Jung-Hoona; d | Lee, Kyung-Eune
Affiliations: [a] Applied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei University, Wonju, Kangwon-do, Korea | [b] Departement of Physical Therapy, Baekseok University, Cheonan-si, Chungcheongnam-do, Korea | [c] Department of Physical Therapy, College of Health Science, Yonsei University, Wonju-si, Kangwon-do, Korea | [d] Department of Rehabilitation Team, Yongin Severance Hospital, Yongin-si, Gyeonggi-do, Korea | [e] Department of Physical Therapy, The Graduate School, Yonsei University, Wonju-si, Kangwon-do, Korea
Correspondence: [*] Corresponding author: Heon-Seock Cynn, Department of Physical Therapy, Yonsei University, 1 Yonseidae-gil, Wonju, Gangwon-do, 26493, Korea. Tel.: +82 33 760 2427; Fax: +82 33 760 2496; E-mail: [email protected].
Abstract: BACKGROUND: The effectiveness of side-sling plank (SSP) exercises on trunk and hip muscle activation in subjects with gluteus medius (Gmed) weakness is unclear. OBJECTIVE: To quantify muscle activation of the rectus abdominis (RA), external oblique (EO), erector spinae (ES), lumbar multifidus (LM), Gmed, gluteus maximus (Gmax), and tensor fasciae latae (TFL) during SSP with three different hip rotations compared to side-lying hip abduction (SHA) exercise in subjects with Gmed weakness. METHODS: Twenty-two subjects with Gmed weakness were recruited. SHA and three types of SSP exercises were performed: SSP with neutral hip (SSP-N), hip lateral rotation (SSP-L), and hip medial rotation (SSP-M). Surface electromyography was used to measure the activation of the trunk and hip muscles. RESULTS: The trunk and hip muscles activations were generally significantly higher level during three SSP than SHA. SSP-M showed significantly lower EO activation while significantly higher ES and LM activation than SSP-L. Gmed activation was significantly higher during SSP-M than during SSP-L. TFL activation was significantly lower during SSP-M than during SSP-N and SSP-L. CONCLUSIONS: SSP could be prescribed for patients who have reduced Gmed strength after injuries. Especially, SSP-M could be applied for patients who have Gmed weakness with dominant TFL.
Keywords: Gluteus medius weakness, side-lying hip abduction, side-sling plank, surface electromyography
DOI: 10.3233/BMR-210061
Journal: Journal of Back and Musculoskeletal Rehabilitation, vol. 35, no. 4, pp. 849-857, 2022
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