Drop punt kicking induces eccentric knee flexor weakness associated with reductions in hamstring electromyographic activity
Duhig, Steven, Minett, Geoffrey M., Williams, Morgan D., Opar, David A., & Shield, Anthony (2016) Drop punt kicking induces eccentric knee flexor weakness associated with reductions in hamstring electromyographic activity. Journal of Science and Medicine in Sport. (In Press)
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- To examine the effect of 100 drop punt kicks on isokinetic knee flexor strength and surface electromyographic (sEMG) activity of bicep femoris (BF) and medial hamstrings (MH).
- Randomised control study.
- Thirty-six recreational footballers were randomly assigned to kicking or control groups. Dynamometry was conducted immediately before and after the kicking or 10 minutes of sitting (control).
- 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 significant between group differences in concentric strength change were observed (p = 0.089; d = 0.60). The decline in normalized eccentric hamstring sEMG (BF and MH combined) was greater in the kicking than the control group (p < 0.001; d =1.78), while changes in concentric hamstring sEMG did not differ between groups (p = 0.863; d = 0.04). Post-kicking reductions in sEMG were greater in eccentric than concentric actions for both BF (p = 0.008; d = 0.77) and MH (p < 0.001; d = 1.11). In contrast, the control group exhibited smaller reductions in eccentric than concentric hamstring sEMG for BF (p = 0.026; d = 0.64) and MH (p = 0.032; d = 0.53). Reductions in BF sEMG were correlated with eccentric strength decline (R = 0.645; p = 0.007).
- Reductions in knee flexor strength and hamstring sEMG are largely limited to eccentric contractions and this should be considered when planning training loads in Australian Football.
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|Item Type:||Journal Article|
|Keywords:||Australian Football, Isokinetic dynamometry, Muscle fatigue|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > HUMAN MOVEMENT AND SPORTS SCIENCE (110600) > Biomechanics (110601)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > HUMAN MOVEMENT AND SPORTS SCIENCE (110600) > Sports Medicine (110604)
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Exercise & Nutrition Sciences
|Copyright Owner:||Copyright 2016 Elsevier|
|Deposited On:||12 Sep 2016 21:56|
|Last Modified:||19 Oct 2016 01:30|
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