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Pelvic stabilization and semisitting position increase the specificity of back exercises.
Med Sci Sports Exerc. 2009 Feb; 41(2):435-43.MS

Abstract

PURPOSE

To examine the effect of pelvic stabilization and two lower-limb configurations on the EMG activity of back and hip extensor muscles during a dynamic back extension exercise on a machine and to compare them between sexes.

METHODS

Twenty-two healthy volunteers (11 men and 11 women) performed five trunk flexion-extension cycles at 40% of their maximal voluntary contraction (MVC) in a machine designed for back exercise. Two different positions were used: 1) seated position (seat horizontal, knees at 90 degrees) and 2) semisitting position (seat slightly tilted forward at 15 degrees , knees at 45 degrees of flexion). In each position, three pelvic stabilization conditions were tested: 1) unrestrained (control condition), 2) partially restrained (posteriorly), and 3) totally restrained (posteriorly and anteriorly). EMG signals were recorded bilaterally with 12 pairs of electrodes placed on back muscles as well as on the gluteus maximus and biceps femoris. The muscular activation level, that is, the percentage of EMG amplitude relative to the maximal EMG obtained from MVC, was used to asses the relative contribution of each muscle group across exercises.

RESULTS

In both sexes, two main results were found: 1) pelvic stabilization (partially and totally restrained) significantly (P < 0.05) increased the activity of all back muscles (average of 12%) and 2) semisitting position significantly decreased (range = 8-27%) the activity of two hip extensors compared with the seated position. Sex differences were also observed relative to the activity of some back muscles as well as the biceps femoris.

CONCLUSIONS

Combining pelvic stabilization and semisitting position in back exercise machines might be a useful way to localize the effects of endurance training at the back muscles and this in both the sexes.

Links

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Authors+Show Affiliations

da Silva RA
Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Montreal Rehabilitation Institute, Montreal, Quebec, Canada.
Larivière C
No affiliation info available
Arsenault AB
No affiliation info available
Nadeau S
No affiliation info available
Plamondon A
No affiliation info available

MeSH

AdultBiomechanical PhenomenaButtocksCohort StudiesElectromyographyFemaleHipHumansLow Back PainLumbosacral RegionMaleMiddle AgedMuscle, SkeletalResistance TrainingSex FactorsYoung Adult

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19127180

Clinical Trial Links

Effect of Volume Training on Back Endurance

Citation

da Silva, Rubens A., et al. "Pelvic Stabilization and Semisitting Position Increase the Specificity of Back Exercises." Medicine and Science in Sports and Exercise, vol. 41, no. 2, 2009, pp. 435-43.
da Silva RA, Larivière C, Arsenault AB, et al. Pelvic stabilization and semisitting position increase the specificity of back exercises. Med Sci Sports Exerc. 2009;41(2):435-43.
da Silva, R. A., Larivière, C., Arsenault, A. B., Nadeau, S., & Plamondon, A. (2009). Pelvic stabilization and semisitting position increase the specificity of back exercises. Medicine and Science in Sports and Exercise, 41(2), 435-43. https://doi.org/10.1249/MSS.0b013e318188446a
da Silva RA, et al. Pelvic Stabilization and Semisitting Position Increase the Specificity of Back Exercises. Med Sci Sports Exerc. 2009;41(2):435-43. PubMed PMID: 19127180.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pelvic stabilization and semisitting position increase the specificity of back exercises. AU - da Silva,Rubens A, AU - Larivière,Christian, AU - Arsenault,A Bertrand, AU - Nadeau,Sylvie, AU - Plamondon,André, PY - 2009/1/8/entrez PY - 2009/1/8/pubmed PY - 2009/5/9/medline SP - 435 EP - 43 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 41 IS - 2 N2 - PURPOSE: To examine the effect of pelvic stabilization and two lower-limb configurations on the EMG activity of back and hip extensor muscles during a dynamic back extension exercise on a machine and to compare them between sexes. METHODS: Twenty-two healthy volunteers (11 men and 11 women) performed five trunk flexion-extension cycles at 40% of their maximal voluntary contraction (MVC) in a machine designed for back exercise. Two different positions were used: 1) seated position (seat horizontal, knees at 90 degrees) and 2) semisitting position (seat slightly tilted forward at 15 degrees , knees at 45 degrees of flexion). In each position, three pelvic stabilization conditions were tested: 1) unrestrained (control condition), 2) partially restrained (posteriorly), and 3) totally restrained (posteriorly and anteriorly). EMG signals were recorded bilaterally with 12 pairs of electrodes placed on back muscles as well as on the gluteus maximus and biceps femoris. The muscular activation level, that is, the percentage of EMG amplitude relative to the maximal EMG obtained from MVC, was used to asses the relative contribution of each muscle group across exercises. RESULTS: In both sexes, two main results were found: 1) pelvic stabilization (partially and totally restrained) significantly (P < 0.05) increased the activity of all back muscles (average of 12%) and 2) semisitting position significantly decreased (range = 8-27%) the activity of two hip extensors compared with the seated position. Sex differences were also observed relative to the activity of some back muscles as well as the biceps femoris. CONCLUSIONS: Combining pelvic stabilization and semisitting position in back exercise machines might be a useful way to localize the effects of endurance training at the back muscles and this in both the sexes. SN - 1530-0315 UR - https://www.unboundmedicine.com/medline/citation/19127180/Pelvic_stabilization_and_semisitting_position_increase_the_specificity_of_back_exercises_ L2 - https://doi.org/10.1249/MSS.0b013e318188446a DB - PRIME DP - Unbound Medicine ER -