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Hamstring myoelectrical activity during three different kettlebell swing exercises.

Del Monte, Michael J1; Opar, David A1; Timmins, Ryan G1; Ross, James1; Keogh, Justin WL2,3,4; Lorenzen, Christian1

The Journal of Strength & Conditioning Research: September 11, 2017 - Volume Publish Ahead of Print - Issue - p
doi: 10.1519/JSC.0000000000002254
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Kettlebell exercises have become an increasingly popular form of resistance training and component of lower body rehabilitative training programs; despite a lack of scientific literature illustrating internal mechanisms and effectiveness of these approaches. Participants (n=14) performed three different styles of kettlebell swings (hip hinge, squat and double knee extension) and were assessed for medial hamstrings (MH) and biceps femoris (BF) myoelectrical activity via surface electromyography (sEMG). Bipolar pre-gelled Ag/AgCl surface electromyography (sEMG) electrodes (10mm diameter, 20mm inter-electrode distance) were placed on the participant’s dominant limb after correct skin preparation.

There was a main effect for swing type (p = 0.004), where the hip hinge swing elicited a greater overall MH and BF sEMG in comparison to the squat swing (mean difference = 3.92; 95% CI = 1.53 to 6.32; p = 0.002) and the double knee extension swing (mean difference = 5.32; 95% CI = 0.80 to 9.83; p = 0.020). Across all swing types, normalised percentage of MH sEMG was significantly higher compared to the BF (mean difference = 9.93; 95% CI = 1.67 to 18.19; p = 0.022). The hip hinge kettlebell swing produced the greatest amount of hamstring sEMG for the three styles of kettlebell swings assessed. These findings have implications for the application of kettlebell swing exercises in strength and conditioning, injury prevention and rehabilitation programs.

1School of Exercise Science, Australian Catholic University, Melbourne, Australia

2Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Australia

3Sports Performance Research Centre New Zealand, AUT University, Auckland, New Zealand

4Cluster for Health Improvement, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast

Corresponding Authors: James Ross School of Exercise Science, Australian Catholic University, Victoria, Australia Postal address: Locked Bag 4115, Fitzroy VIC 3065 Phone Number: +61 411 570 484 Email: james.ross33@yahoo.com

Funding Disclosure: No funding was received for this research

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