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Kettlebell swing, snatch, and bottoms-up carry: back and hip muscle activation, motion, and low back loads.
J Strength Cond Res. 2012 Jan; 26(1):16-27.JS

Abstract

The intent of this study was to quantify spine loading during different kettlebell swings and carries. No previously published studies of tissue loads during kettlebell exercises could be found. Given the popularity of kettlebells, this study was designed to provide an insight into the resulting joint loads. Seven male subjects participated in this investigation. In addition, a single case study of the kettlebell swing was performed on an accomplished kettlebell master. Electromyography, ground reaction forces (GRFs), and 3D kinematic data were recorded during exercises using a 16-kg kettlebell. These variables were input into an anatomically detailed biomechanical model that used normalized muscle activation; GRF; and spine, hip, and knee motion to calculate spine compression and shear loads. It was found that kettlebell swings create a hip-hinge squat pattern characterized by rapid muscle activation-relaxation cycles of substantial magnitudes (∼50% of a maximal voluntary contraction [MVC] for the low back extensors and 80% MVC for the gluteal muscles with a 16-kg kettlebell) resulting in about 3,200 N of low back compression. Abdominal muscular pulses together with the muscle bracing associated with carries create kettlebell-specific training opportunities. Some unique loading patterns discovered during the kettlebell swing included the posterior shear of the L4 vertebra on L5, which is opposite in polarity to a traditional lift. Thus, quantitative analysis provides an insight into why many individuals credit kettlebell swings with restoring and enhancing back health and function, although a few find that they irritate tissues.

Authors+Show Affiliations

Spine Biomechanics Laboratories, Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada. mcgill@healthy.uwaterloo.caNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21997449

Citation

McGill, Stuart M., and Leigh W. Marshall. "Kettlebell Swing, Snatch, and Bottoms-up Carry: Back and Hip Muscle Activation, Motion, and Low Back Loads." Journal of Strength and Conditioning Research, vol. 26, no. 1, 2012, pp. 16-27.
McGill SM, Marshall LW. Kettlebell swing, snatch, and bottoms-up carry: back and hip muscle activation, motion, and low back loads. J Strength Cond Res. 2012;26(1):16-27.
McGill, S. M., & Marshall, L. W. (2012). Kettlebell swing, snatch, and bottoms-up carry: back and hip muscle activation, motion, and low back loads. Journal of Strength and Conditioning Research, 26(1), 16-27. https://doi.org/10.1519/JSC.0b013e31823a4063
McGill SM, Marshall LW. Kettlebell Swing, Snatch, and Bottoms-up Carry: Back and Hip Muscle Activation, Motion, and Low Back Loads. J Strength Cond Res. 2012;26(1):16-27. PubMed PMID: 21997449.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kettlebell swing, snatch, and bottoms-up carry: back and hip muscle activation, motion, and low back loads. AU - McGill,Stuart M, AU - Marshall,Leigh W, PY - 2011/10/15/entrez PY - 2011/10/15/pubmed PY - 2012/4/26/medline SP - 16 EP - 27 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 26 IS - 1 N2 - The intent of this study was to quantify spine loading during different kettlebell swings and carries. No previously published studies of tissue loads during kettlebell exercises could be found. Given the popularity of kettlebells, this study was designed to provide an insight into the resulting joint loads. Seven male subjects participated in this investigation. In addition, a single case study of the kettlebell swing was performed on an accomplished kettlebell master. Electromyography, ground reaction forces (GRFs), and 3D kinematic data were recorded during exercises using a 16-kg kettlebell. These variables were input into an anatomically detailed biomechanical model that used normalized muscle activation; GRF; and spine, hip, and knee motion to calculate spine compression and shear loads. It was found that kettlebell swings create a hip-hinge squat pattern characterized by rapid muscle activation-relaxation cycles of substantial magnitudes (∼50% of a maximal voluntary contraction [MVC] for the low back extensors and 80% MVC for the gluteal muscles with a 16-kg kettlebell) resulting in about 3,200 N of low back compression. Abdominal muscular pulses together with the muscle bracing associated with carries create kettlebell-specific training opportunities. Some unique loading patterns discovered during the kettlebell swing included the posterior shear of the L4 vertebra on L5, which is opposite in polarity to a traditional lift. Thus, quantitative analysis provides an insight into why many individuals credit kettlebell swings with restoring and enhancing back health and function, although a few find that they irritate tissues. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/21997449/Kettlebell_swing_snatch_and_bottoms_up_carry:_back_and_hip_muscle_activation_motion_and_low_back_loads_ DB - PRIME DP - Unbound Medicine ER -