- Title
- Musculoskeletal stiffness during hopping and running does not change following downhill backwards walking
- Creator
- Joseph, Corey; Bradshaw, Elizabeth; Kemp, Justin; Clark, Ross
- Date
- 2014
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/76655
- Identifier
- vital:7586
- Identifier
-
https://doi.org/10.1080/14763141.2014.914240
- Identifier
- ISSN:1476-3141
- Abstract
- Eccentric contractions that provide spring energy can also cause muscle damage. The aim of this study was to explore leg and vertical stiffness following muscle damage induced by an eccentric exercise protocol. Twenty active males completed 60 minutes of backward-walking on a treadmill at 0.67 m/s and a gradient of − 8.5° to induce muscle damage. Tests were performed immediately before; immediately post; and 24, 48, and 168 hours post eccentric exercise. Tests included running at 3.35 m/s and hopping at 2.2 Hz using single- and double-legged actions. Leg and vertical stiffness were measured from kinetic and kinematic data, and electromyography (EMG) of five muscles of the preferred limb were recorded during hopping. Increases in pain scores (over 37%) occurred post-exercise and 24 and 48 hours later (p < 0.001). A 7% decrease in maximal voluntary contraction occurred immediately post-exercise (p = 0.019). Changes in knee kinematics during single-legged hopping were observed 168 hours post (p < 0.05). No significant changes were observed in EMG, creatine kinase activity, leg, or vertical stiffness. Results indicate that knee mechanics may be altered to maintain consistent levels of leg and vertical stiffness when eccentric exercise-induced muscle damage is present in the lower legs. © 2014 Taylor & Francis.
- Publisher
- Routledge
- Relation
- Sports Biomechanics Vol. 13, no. 3 (2014), p. 241-258
- Rights
- Copyright Routledge
- Rights
- Open Access
- Rights
- This metadata is freely available under a CCO license
- Subject
- Eccentric exercise; Electromyography; Kinematics; Kinetics; Leg spring; 1106 Human Movement and Sports Science; 1303 Specialist Studies In Education; 0913 Mechanical Engineering
- Full Text
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