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Changing the stability conditions in a back squat: the effect on maximum load lifted and erector spinae muscle activity.
Sports Biomech. 2014 Nov; 13(4):380-90.SB

Abstract

The aim of this study was to identify how changes in the stability conditions of a back squat affect maximal loads lifted and erector spinae muscle activity. Fourteen male participants performed a Smith Machine (SM) squat, the most stable condition, a barbell back (BB) squat, and Tendo-destabilizing bar (TBB) squat, the least stable condition. A one repetition max (1-RM) was established in each squat condition, before electromyography (EMG) activity of the erector spinae was measured at 85% of 1-RM. Results indicated that the SM squat 1-RM load was significantly (p = 0.006) greater (10.9%) than the BB squat, but not greater than the TBB squat. EMG results indicated significantly greater (p < 0.05) muscle activation in the TBB condition compared to other conditions. The BB squat produced significantly greater (p = 0.036) EMG activity compared to the SM squat. A greater stability challenge applied to the torso seems to increase muscle activation. The maximum loads lifted in the most stable and unstable squats were similar. However, the lift with greater stability challenge required greatest muscle activation. The implications of this study may be important for training programmes; if coaches wish to challenge trunk stability, while their athletes lift maximal loads designed to increase strength.

Authors+Show Affiliations

a Department of Sport Science & Physical Activity , University of Bedfordshire , Bedford , UK.No affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

25434609

Citation

Fletcher, Iain M., and Ashley Bagley. "Changing the Stability Conditions in a Back Squat: the Effect On Maximum Load Lifted and Erector Spinae Muscle Activity." Sports Biomechanics, vol. 13, no. 4, 2014, pp. 380-90.
Fletcher IM, Bagley A. Changing the stability conditions in a back squat: the effect on maximum load lifted and erector spinae muscle activity. Sports Biomech. 2014;13(4):380-90.
Fletcher, I. M., & Bagley, A. (2014). Changing the stability conditions in a back squat: the effect on maximum load lifted and erector spinae muscle activity. Sports Biomechanics, 13(4), 380-90. https://doi.org/10.1080/14763141.2014.982697
Fletcher IM, Bagley A. Changing the Stability Conditions in a Back Squat: the Effect On Maximum Load Lifted and Erector Spinae Muscle Activity. Sports Biomech. 2014;13(4):380-90. PubMed PMID: 25434609.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Changing the stability conditions in a back squat: the effect on maximum load lifted and erector spinae muscle activity. AU - Fletcher,Iain M, AU - Bagley,Ashley, Y1 - 2014/12/01/ PY - 2014/12/2/entrez PY - 2014/12/2/pubmed PY - 2015/3/12/medline KW - Electromyography KW - muscle activity KW - squat performance KW - torso instability SP - 380 EP - 90 JF - Sports biomechanics JO - Sports Biomech VL - 13 IS - 4 N2 - The aim of this study was to identify how changes in the stability conditions of a back squat affect maximal loads lifted and erector spinae muscle activity. Fourteen male participants performed a Smith Machine (SM) squat, the most stable condition, a barbell back (BB) squat, and Tendo-destabilizing bar (TBB) squat, the least stable condition. A one repetition max (1-RM) was established in each squat condition, before electromyography (EMG) activity of the erector spinae was measured at 85% of 1-RM. Results indicated that the SM squat 1-RM load was significantly (p = 0.006) greater (10.9%) than the BB squat, but not greater than the TBB squat. EMG results indicated significantly greater (p < 0.05) muscle activation in the TBB condition compared to other conditions. The BB squat produced significantly greater (p = 0.036) EMG activity compared to the SM squat. A greater stability challenge applied to the torso seems to increase muscle activation. The maximum loads lifted in the most stable and unstable squats were similar. However, the lift with greater stability challenge required greatest muscle activation. The implications of this study may be important for training programmes; if coaches wish to challenge trunk stability, while their athletes lift maximal loads designed to increase strength. SN - 1476-3141 UR - https://www.unboundmedicine.com/medline/citation/25434609/Changing_the_stability_conditions_in_a_back_squat:_the_effect_on_maximum_load_lifted_and_erector_spinae_muscle_activity_ L2 - https://www.tandfonline.com/doi/full/10.1080/14763141.2014.982697 DB - PRIME DP - Unbound Medicine ER -