Experimentally reduced hip-abductor muscle strength and frontal-plane biomechanics during walking.
| Autor: | Pohl MB; Department of Kinesiology and Health Promotion, University of Kentucky, Lexington., Kendall KD, Patel C, Wiley JP, Emery C, Ferber R |
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| Jazyk: | angličtina |
| Zdroj: | Journal of athletic training [J Athl Train] 2015 Apr; Vol. 50 (4), pp. 385-91. |
| DOI: | 10.4085/1062-6050-49.5.07 |
| Abstrakt: | Context: Researchers have postulated that reduced hip-abductor muscle strength may have a role in the progression of knee osteoarthritis by increasing the external knee-adduction moment. However, the relationship between hip-abductor strength and frontal-plane biomechanics remains unclear. Objective: To experimentally reduce hip-abduction strength and observe the subsequent changes in frontal-plane biomechanics. Design: Descriptive laboratory study. Setting: Research laboratory. Patients or Other Participants: Eight healthy, recreationally active men (age = 27 ± 6 years, height = 1.75 ± 0.11 m, mass = 76.1 ± 10.0 kg). Intervention(s): All participants underwent a superior gluteal nerve block injection to reduce the force output of the hip-abductor muscle group. Main Outcome Measure(s): Maximal isometric hip-abduction strength and gait biomechanical data were collected before and after the injections. Gait biomechanical variables collected during walking consisted of knee- and hip-adduction moments and impulses and the peak angles of contralateral pelvic drop, hip adduction, and ipsilateral trunk lean. Results: Hip-abduction strength was reduced after the injection (P = .001) and remained lower than baseline values at the completion of the postinjection gait data collection (P = .02). No alterations in hip- or knee-adduction moments (hip: P = .11; knee: P = .52) or impulses (hip: P = .16; knee: P = .41) were found after the nerve block. Similarly, no changes in angular kinematics were observed for contralateral pelvic drop (P = .53), ipsilateral trunk lean (P = .78), or hip adduction (P = .48). Conclusions: A short-term reduction in hip-abductor strength was not associated with alterations in the frontal-plane gait biomechanics of young, healthy men. Further research is needed to determine whether a similar relationship is true in older adults with knee osteoarthritis. |
| Databáze: | MEDLINE |
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