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Impact of resistance training status on trunk muscle activation in a fatiguing set of heavy back squats.
Eur J Appl Physiol. 2021 Feb; 121(2):597-608.EJ

Abstract

PURPOSE

In this study we measured neural activation (EMG) in four trunk stabilizer muscles and vastus lateralis (VL) in trained and novice participants during a set of squat repetitions to volitional fatigue at 85% 1RM.

METHODS

Forty males were recruited into two groups, novice (NG: n = 21) and experienced (EG: n = 19), according to relative squat 1RM. Participants were tested twice to: (1) determine squat 1RM, and (2) complete a single set of repetitions to volitional fatigue at 85% 1RM. Relative squat 1RM; NG < 140% body mass, EG > 160% body mass. Neuromuscular activation was measured by EMG for the following: rectus abdominus (RA), external oblique (EO), lumbar sacral erector spinae (LSES), upper lumbar erector spinae (ULES) and VL in eccentric and concentric phase. Completed repetitions, RPE and EMG in repetition 1 and at 20, 40, 60, 80 and 100% of completed repetitions were analysed.

RESULTS

No group differences were found between number repetitions completed and RPE in repetitions to volitional fatigue at 85% 1RM. Neuromuscular activation increased significantly in all muscle groups in eccentric and concentric phase apart from RA in the eccentric phase. Trunk neuromuscular activation was higher in NG compared to EG and this was significant in EO, LSES and ULES in eccentric phase and LSES in the concentric phase. VL activation increased in both phases with no group differences.

CONCLUSION

Trunk neuromuscular activation increases in a fatiguing set of heavy squats regardless of training status. Increased back squat strength through training results in lower neuromuscular activation despite greater absolute external squat loads.

Authors+Show Affiliations

School of Sport and Exercise Sciences, Faculty of Science, Liverpool John Moore's University, Liverpool, UK. d.r.clark@ljmu.ac.uk.Division of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, South Africa.Physiology, Exercise and Nutrition Research Group, Faculty of Health Sciences and Sport, University of Stirling, Stirling, UK.Physiology, Exercise and Nutrition Research Group, Faculty of Health Sciences and Sport, University of Stirling, Stirling, UK.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33206252

Citation

Clark, David R., et al. "Impact of Resistance Training Status On Trunk Muscle Activation in a Fatiguing Set of Heavy Back Squats." European Journal of Applied Physiology, vol. 121, no. 2, 2021, pp. 597-608.
Clark DR, Lambert MI, Grigson C, et al. Impact of resistance training status on trunk muscle activation in a fatiguing set of heavy back squats. Eur J Appl Physiol. 2021;121(2):597-608.
Clark, D. R., Lambert, M. I., Grigson, C., & Hunter, A. M. (2021). Impact of resistance training status on trunk muscle activation in a fatiguing set of heavy back squats. European Journal of Applied Physiology, 121(2), 597-608. https://doi.org/10.1007/s00421-020-04540-0
Clark DR, et al. Impact of Resistance Training Status On Trunk Muscle Activation in a Fatiguing Set of Heavy Back Squats. Eur J Appl Physiol. 2021;121(2):597-608. PubMed PMID: 33206252.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Impact of resistance training status on trunk muscle activation in a fatiguing set of heavy back squats. AU - Clark,David R, AU - Lambert,Michael I, AU - Grigson,Chris, AU - Hunter,Angus M, Y1 - 2020/11/18/ PY - 2020/06/01/received PY - 2020/10/22/accepted PY - 2020/11/19/pubmed PY - 2020/11/19/medline PY - 2020/11/18/entrez KW - Back squat KW - Electromyography KW - Neuromuscular KW - Strength training KW - Trunk stabilizers SP - 597 EP - 608 JF - European journal of applied physiology JO - Eur J Appl Physiol VL - 121 IS - 2 N2 - PURPOSE: In this study we measured neural activation (EMG) in four trunk stabilizer muscles and vastus lateralis (VL) in trained and novice participants during a set of squat repetitions to volitional fatigue at 85% 1RM. METHODS: Forty males were recruited into two groups, novice (NG: n = 21) and experienced (EG: n = 19), according to relative squat 1RM. Participants were tested twice to: (1) determine squat 1RM, and (2) complete a single set of repetitions to volitional fatigue at 85% 1RM. Relative squat 1RM; NG < 140% body mass, EG > 160% body mass. Neuromuscular activation was measured by EMG for the following: rectus abdominus (RA), external oblique (EO), lumbar sacral erector spinae (LSES), upper lumbar erector spinae (ULES) and VL in eccentric and concentric phase. Completed repetitions, RPE and EMG in repetition 1 and at 20, 40, 60, 80 and 100% of completed repetitions were analysed. RESULTS: No group differences were found between number repetitions completed and RPE in repetitions to volitional fatigue at 85% 1RM. Neuromuscular activation increased significantly in all muscle groups in eccentric and concentric phase apart from RA in the eccentric phase. Trunk neuromuscular activation was higher in NG compared to EG and this was significant in EO, LSES and ULES in eccentric phase and LSES in the concentric phase. VL activation increased in both phases with no group differences. CONCLUSION: Trunk neuromuscular activation increases in a fatiguing set of heavy squats regardless of training status. Increased back squat strength through training results in lower neuromuscular activation despite greater absolute external squat loads. SN - 1439-6327 UR - https://www.unboundmedicine.com/medline/citation/33206252/Impact_of_resistance_training_status_on_trunk_muscle_activation_in_a_fatiguing_set_of_heavy_back_squats_ L2 - https://dx.doi.org/10.1007/s00421-020-04540-0 DB - PRIME DP - Unbound Medicine ER -
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