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Reliability of Trunk Muscle Electromyography in the Loaded Back Squat Exercise.
Int J Sports Med. 2016 Jun; 37(6):448-56.IJ

Abstract

Trunk muscle activation (TMA) has been reported during back squat exercise, however reliability and sensitivity to different loads alongside kinematic measures has not. Hence the aim was to determine the interday reliability and load sensitivity of TMA and kinematics during back squats. 10 males performed 3 test sessions: 1) back squat 1RM, 2) and 3) 3 reps at 65, 75, 85 and 95% of system mass max (SMmax). Kinematics were measured from an electrogoniometer and linear transducer, and surface electromyography (sEMG) recorded 4 muscles of the trunk: rectus abdominis (RA), external oblique (EO), upper lumbar erector spinae (ULES) and lumbar sacral erector spinae (LSES), and a reference leg muscle, the vastus lateralus (VL). sEMG amplitude was root mean squared (RMS). No differences (p>0.05) found between tests for any kinematic and RMS data. CV demonstrated moderate interday reliability (~16.1%) for EO, LSES and ULES but not RA (29.4%) during the velocity-controlled eccentric phase; whereas it was moderately acceptable for just LSES and ULES (~17.8%) but not RA and EO (27.9%) during the uncontrolled concentric phase. This study demonstrated acceptable interday reliability for kinematic data while sEMG for most trunk muscle sites was moderately acceptable during controlled contraction. sEMG responded significantly to load.

Authors+Show Affiliations

Fitness Department, Irish Rugby Football Union, Dublin, Ireland.Division of Exercise Science and Sports Medicine, University of Cape Town, Department of Human Biology, Cape Town, South Africa.School of Sport Sciences, University of Stirling, Stirling, United Kingdom of Great Britain and Northern Ireland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26928915

Citation

Clark, D, et al. "Reliability of Trunk Muscle Electromyography in the Loaded Back Squat Exercise." International Journal of Sports Medicine, vol. 37, no. 6, 2016, pp. 448-56.
Clark D, Lambert MI, Hunter AM. Reliability of Trunk Muscle Electromyography in the Loaded Back Squat Exercise. Int J Sports Med. 2016;37(6):448-56.
Clark, D., Lambert, M. I., & Hunter, A. M. (2016). Reliability of Trunk Muscle Electromyography in the Loaded Back Squat Exercise. International Journal of Sports Medicine, 37(6), 448-56. https://doi.org/10.1055/s-0035-1569366
Clark D, Lambert MI, Hunter AM. Reliability of Trunk Muscle Electromyography in the Loaded Back Squat Exercise. Int J Sports Med. 2016;37(6):448-56. PubMed PMID: 26928915.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reliability of Trunk Muscle Electromyography in the Loaded Back Squat Exercise. AU - Clark,D, AU - Lambert,M I, AU - Hunter,A M, Y1 - 2016/02/29/ PY - 2016/3/2/entrez PY - 2016/3/2/pubmed PY - 2017/4/15/medline SP - 448 EP - 56 JF - International journal of sports medicine JO - Int J Sports Med VL - 37 IS - 6 N2 - Trunk muscle activation (TMA) has been reported during back squat exercise, however reliability and sensitivity to different loads alongside kinematic measures has not. Hence the aim was to determine the interday reliability and load sensitivity of TMA and kinematics during back squats. 10 males performed 3 test sessions: 1) back squat 1RM, 2) and 3) 3 reps at 65, 75, 85 and 95% of system mass max (SMmax). Kinematics were measured from an electrogoniometer and linear transducer, and surface electromyography (sEMG) recorded 4 muscles of the trunk: rectus abdominis (RA), external oblique (EO), upper lumbar erector spinae (ULES) and lumbar sacral erector spinae (LSES), and a reference leg muscle, the vastus lateralus (VL). sEMG amplitude was root mean squared (RMS). No differences (p>0.05) found between tests for any kinematic and RMS data. CV demonstrated moderate interday reliability (~16.1%) for EO, LSES and ULES but not RA (29.4%) during the velocity-controlled eccentric phase; whereas it was moderately acceptable for just LSES and ULES (~17.8%) but not RA and EO (27.9%) during the uncontrolled concentric phase. This study demonstrated acceptable interday reliability for kinematic data while sEMG for most trunk muscle sites was moderately acceptable during controlled contraction. sEMG responded significantly to load. SN - 1439-3964 UR - https://www.unboundmedicine.com/medline/citation/26928915/Reliability_of_Trunk_Muscle_Electromyography_in_the_Loaded_Back_Squat_Exercise_ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-0035-1569366 DB - PRIME DP - Unbound Medicine ER -