Drop punt kicking induces eccentric knee flexor weakness associated with reductions in hamstring electromyographic activity
Article
Article Title | Drop punt kicking induces eccentric knee flexor weakness associated with reductions in hamstring electromyographic activity |
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ERA Journal ID | 9776 |
Article Category | Article |
Authors | Duhig, Steven J. (Author), Williams, Morgan (Author), Minett, Geoffrey M. (Author), Opar, David (Author) and Shield, Anthony J. (Author) |
Journal Title | Journal of Science and Medicine in Sport |
Journal Citation | 20 (6), pp. 595-599 |
Number of Pages | 5 |
Year | 2017 |
Publisher | Elsevier |
Place of Publication | Australia |
ISSN | 1440-2440 |
1878-1861 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jsams.2016.09.006 |
Web Address (URL) | http://www.jsams.org/article/S1440-2440(16)30206-7/abstract |
Abstract | Objectives: To examine the effect of 100 drop punt kicks on isokinetic knee flexor strength and surface electromyographic activity of bicep femoris and medial hamstrings. Design: Randomized control study. Methods: Thirty-six recreational footballers were randomly assigned to kicking or control groups. Dynamometry was conducted immediately before and after the kicking or 10 min of sitting (control). Results: Eccentric strength declined more in the kicking than the control group (p < 0.001; d = 1.60), with greater reductions in eccentric than concentric strength after kicking (p=0.001; d=0.92). No signifi- cant between group differences in concentric strength change were observed (p = 0.089; d = 0.60). The decline in normalized eccentric hamstring surface electromyographic (bicep femoris and medial ham- strings combined) was greater in the kicking than the control group (p < 0.001; d = 1.78), while changes in concentric hamstring surface electromyographic did not differ between groups (p = 0.863; d = 0.04). Post-kicking reductions in surface electromyographic were greater in eccentric than concentric actions for both bicep femoris (p = 0.008; d = 0.77) and medial hamstrings (p < 0.001; d = 1.11). In contrast, the control group exhibited smaller reductions in eccentric than concentric hamstring surface electromyo- graphic for bicep femoris (p=0.026; d=0.64) and medial hamstrings (p=0.032; d=0.53). Reductions in bicep femoris surface electromyographic were correlated with eccentric strength decline (R = 0.645; p = 0.007). Conclusions: Reductions in knee flexor strength and hamstring surface electromyographic are largely limited to eccentric contractions and this should be considered when planning training loads in Australian Football. |
Keywords | Australia, football, Australian Rules football, isokinetic dynamometry, neuromuscular fatigue, knee, thigh |
ANZSRC Field of Research 2020 | 420799. Sports science and exercise not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Queensland University of Technology |
University of South Wales, United Kingdom | |
Australian Catholic University | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3x9x/drop-punt-kicking-induces-eccentric-knee-flexor-weakness-associated-with-reductions-in-hamstring-electromyographic-activity
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