Improved Ankle Mobility After a 4-Week Training Program Affects Landing Mechanics: A Randomized Controlled Trial
| Autor: | Jamie S North, Theodoros M. Bampouras, Mark Waldron, Louis P. Howe |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
musculoskeletal diseases
Knee Joint Strength training Physical Therapy Sports Therapy and Rehabilitation law.invention Randomized controlled trial law Humans Ankle dorsiflexion Medicine Orthopedics and Sports Medicine Displacement (orthopedic surgery) Range of Motion Articular Z723 business.industry General Medicine Mechanics Biomechanical Phenomena medicine.anatomical_structure Time to peak Ankle Range of motion business Training program Ankle Joint |
| Zdroj: | Journal of Strength and Conditioning Research. 36:1875-1883 |
| ISSN: | 1064-8011 |
| DOI: | 10.1519/jsc.0000000000003717 |
| Popis: | Howe, LP, Bampouras, TM, North, JS, and Waldron, M. Improved ankle mobility after a 4-week training program affects landing mechanics: a randomized controlled trial. J Strength Cond Res XX(X): 000-000, 2020-This study examined the effects of a 4-week ankle mobility intervention on landing mechanics. Twenty subjects with restricted ankle dorsiflexion range of motion (DF ROM) were allocated to either a strength training only (n = 9) or a strength training and ankle mobility program (n = 11). Subjects performed a weight-bearing lunge test and bilateral drop-landings before and after the intervention. Normalized peak vertical ground reaction force (vGRF), time to peak vGRF, and loading rate were calculated, alongside sagittal-plane initial contact angles, peak angles, and sagittal-plane joint displacement for the ankle, knee, and hip. Frontal-plane projection angles were also calculated. After the intervention, only the strength and mobility group improved ankle DF ROM (mean difference = 4.1°, effect size [ES] = 1.00, p = 0.002). A one-way analysis of covariance found group effects for ankle joint angle at initial contact (p = 0.045), ankle (p < 0.001) and hip joint angle at peak flexion (p = 0.041), and sagittal-plane ankle (p < 0.001) and hip joint displacement (p = 0.024) during bilateral drop-landings. Post hoc analysis revealed that the strength and mobility group landed with greater ankle plantarflexion at initial contact (mean difference = 1.4 ± 2.0°, ES = 0.46) and ankle dorsiflexion at peak flexion (mean difference = 6.3 ± 2.9°, ES = 0.74) after the intervention, resulting in a greater ankle joint displacement (mean difference = 7.7 ± 4.0°, ES = 1.00). However, the strength training only group landed with increased peak hip flexion (mean difference = 14.4 ± 11.0°, ES = 0.70) and hip joint displacement (mean difference = 8.0 ± 6.6°, ES = 0.44) during post-testing. The findings suggest that changes in landing strategies following the performance of a strength training program are specific to whether restrictions in ankle mobility are considered as part of the intervention. |
| Databáze: | OpenAIRE |
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