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Trunk muscle electromyographic activity with unstable and unilateral exercises.
J Strength Cond Res. 2005 Feb; 19(1):193-201.JS

Abstract

The purpose of this cross-sectional study was to evaluate the effect of unstable and unilateral resistance exercises on trunk muscle activation. Eleven subjects (6 men and 5 women) between 20 and 45 years of age participated. Six trunk exercises, as well as unilateral and bilateral shoulder and chest presses against resistance, were performed on stable (bench) and unstable (Swiss ball) bases. Electromyographic activity of the upper lumbar, lumbosacral erector spinae, and lower-abdominal muscles were monitored. Instability generated greater activation of the lower-abdominal stabilizer musculature (27.9%) with the trunk exercises and all trunk stabilizers (37.7-54.3%) with the chest press. There was no effect of instability on the shoulder press. Unilateral shoulder press produced greater activation of the back stabilizers, and unilateral chest press resulted in higher activation of all trunk stabilizers, when compared with bilateral presses. Regardless of stability, the superman exercise was the most effective trunk-stabilizer exercise for back-stabilizer activation, whereas the side bridge was the optimal exercise for lower-abdominal muscle activation. Thus, the most effective means for trunk strengthening should involve back or abdominal exercises with unstable bases. Furthermore, trunk strengthening can also occur when performing resistance exercises for the limbs, if the exercises are performed unilaterally.

Authors+Show Affiliations

School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland, Canada. dbehem@mun.caNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15705034

Citation

Behm, David G., et al. "Trunk Muscle Electromyographic Activity With Unstable and Unilateral Exercises." Journal of Strength and Conditioning Research, vol. 19, no. 1, 2005, pp. 193-201.
Behm DG, Leonard AM, Young WB, et al. Trunk muscle electromyographic activity with unstable and unilateral exercises. J Strength Cond Res. 2005;19(1):193-201.
Behm, D. G., Leonard, A. M., Young, W. B., Bonsey, W. A., & MacKinnon, S. N. (2005). Trunk muscle electromyographic activity with unstable and unilateral exercises. Journal of Strength and Conditioning Research, 19(1), 193-201.
Behm DG, et al. Trunk Muscle Electromyographic Activity With Unstable and Unilateral Exercises. J Strength Cond Res. 2005;19(1):193-201. PubMed PMID: 15705034.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Trunk muscle electromyographic activity with unstable and unilateral exercises. AU - Behm,David G, AU - Leonard,Allison M, AU - Young,Warren B, AU - Bonsey,W Andrew C, AU - MacKinnon,Scott N, PY - 2005/2/12/pubmed PY - 2005/6/21/medline PY - 2005/2/12/entrez SP - 193 EP - 201 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 19 IS - 1 N2 - The purpose of this cross-sectional study was to evaluate the effect of unstable and unilateral resistance exercises on trunk muscle activation. Eleven subjects (6 men and 5 women) between 20 and 45 years of age participated. Six trunk exercises, as well as unilateral and bilateral shoulder and chest presses against resistance, were performed on stable (bench) and unstable (Swiss ball) bases. Electromyographic activity of the upper lumbar, lumbosacral erector spinae, and lower-abdominal muscles were monitored. Instability generated greater activation of the lower-abdominal stabilizer musculature (27.9%) with the trunk exercises and all trunk stabilizers (37.7-54.3%) with the chest press. There was no effect of instability on the shoulder press. Unilateral shoulder press produced greater activation of the back stabilizers, and unilateral chest press resulted in higher activation of all trunk stabilizers, when compared with bilateral presses. Regardless of stability, the superman exercise was the most effective trunk-stabilizer exercise for back-stabilizer activation, whereas the side bridge was the optimal exercise for lower-abdominal muscle activation. Thus, the most effective means for trunk strengthening should involve back or abdominal exercises with unstable bases. Furthermore, trunk strengthening can also occur when performing resistance exercises for the limbs, if the exercises are performed unilaterally. SN - 1064-8011 UR - https://www.unboundmedicine.com/medline/citation/15705034/Trunk_muscle_electromyographic_activity_with_unstable_and_unilateral_exercises_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=15705034.ui DB - PRIME DP - Unbound Medicine ER -