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Trunk muscle activity increases with unstable squat movements.
Can J Appl Physiol. 2005 Feb; 30(1):33-45.CJ

Abstract

The objective of this study was to determine differences in electromyographic (EMG) activity of the soleus (SOL), vastus lateralis (VL), biceps femoris (BF), abdominal stabilizers (AS), upper lumbar erector spinae (ULES), and lumbo-sacral erector spinae (LSES) muscles while performing squats of varied stability and resistance. Stability was altered by doing the squat movement on a Smith machine, a free squat, and while standing on two balance discs. Fourteen male subjects performed the movements. Activities of the SOL, AS, ULES, and LSES were highest during the unstable squat and lowest with the Smith machine protocol (p < 0.05). Increased EMG activity of these muscles may be attributed to their postural and stabilization role. Furthermore, EMG activity was higher during concentric contractions compared to eccentric contractions. Performing squats on unstable surfaces may permit a training adaptation of the trunk muscles responsible for supporting the spinal column (i.e., erector spinae) as well as the muscles most responsible for maintaining posture (i.e., SOL).

Authors+Show Affiliations

School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland, A1C 5S7.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

15855681

Citation

Anderson, Kenneth, and David G. Behm. "Trunk Muscle Activity Increases With Unstable Squat Movements." Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee, vol. 30, no. 1, 2005, pp. 33-45.
Anderson K, Behm DG. Trunk muscle activity increases with unstable squat movements. Can J Appl Physiol. 2005;30(1):33-45.
Anderson, K., & Behm, D. G. (2005). Trunk muscle activity increases with unstable squat movements. Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee, 30(1), 33-45.
Anderson K, Behm DG. Trunk Muscle Activity Increases With Unstable Squat Movements. Can J Appl Physiol. 2005;30(1):33-45. PubMed PMID: 15855681.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Trunk muscle activity increases with unstable squat movements. AU - Anderson,Kenneth, AU - Behm,David G, PY - 2005/4/28/pubmed PY - 2005/5/20/medline PY - 2005/4/28/entrez SP - 33 EP - 45 JF - Canadian journal of applied physiology = Revue canadienne de physiologie appliquee JO - Can J Appl Physiol VL - 30 IS - 1 N2 - The objective of this study was to determine differences in electromyographic (EMG) activity of the soleus (SOL), vastus lateralis (VL), biceps femoris (BF), abdominal stabilizers (AS), upper lumbar erector spinae (ULES), and lumbo-sacral erector spinae (LSES) muscles while performing squats of varied stability and resistance. Stability was altered by doing the squat movement on a Smith machine, a free squat, and while standing on two balance discs. Fourteen male subjects performed the movements. Activities of the SOL, AS, ULES, and LSES were highest during the unstable squat and lowest with the Smith machine protocol (p < 0.05). Increased EMG activity of these muscles may be attributed to their postural and stabilization role. Furthermore, EMG activity was higher during concentric contractions compared to eccentric contractions. Performing squats on unstable surfaces may permit a training adaptation of the trunk muscles responsible for supporting the spinal column (i.e., erector spinae) as well as the muscles most responsible for maintaining posture (i.e., SOL). SN - 1066-7814 UR - https://www.unboundmedicine.com/medline/citation/15855681/Trunk_muscle_activity_increases_with_unstable_squat_movements_ DB - PRIME DP - Unbound Medicine ER -