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Electromyographic assessment of muscle activity between genders during unilateral weight-bearing tasks using adjusted distances.
MedLine Citation:
PMID:  23316423     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
PURPOSE/BACKGROUND: Researchers have observed differences in muscle activity patterns between males and females during functional exercises. The research methods employed have used various step heights and lunge distances to assess functional exercise making gender comparisons difficult. The purpose of this study was to examine core and lower extremity muscle activity between genders during single-limb exercises using adjusted distances and step heights based on a percentage of the participant's height.
METHODS: Twenty men and 20 women who were recreationally active and healthy participated in the study. Two-dimensional video and surface electromyography (SEMG) were used to assess performance during three exercise maneuvers (step down, forward lunge, and side-step lunge). Eight muscles were assessed using SEMG (rectus abdominus, external oblique, erector spinae, rectus femoris, tensor fascia latae, gluteus medius, gluteus maximus, biceps femoris). Maximal voluntary isometric contractions (MVIC) were used for each muscle and expressed as %MVIC to normalize SEMG to account for body mass differences. Exercises were randomized and distances were normalized to the participant's lower limb length. Descriptive statistics, mixed-model ANOVA, and ICCs with 95% confidence intervals were calculated.
RESULTS: Males were taller, heavier, and had longer leg length when compared to the females. No differences in %MVIC activity were found between genders by task across the eight muscles. For both males and females, the step down task resulted in higher %MVIC for gluteus maximus compared to lunge, (p=0.002). Step down exercise produced higher %MVIC for gluteus medius than lunge (p=0.002) and side step (p=0.006). ICC(3,3) ranged from moderate to high (0.74 to 0.97) for the three tasks.
CONCLUSIONS: Muscle activation among the eight muscles was similar between females and males during the lunge, side-step, and step down tasks, with distances adjusted to leg length. Both males and females elicited higher muscle activity for gluteus maximus and gluteus medius as compared to the trunk, hip flexors, or hamstring muscles. However these values were well below the recruitment levels necessary for strengthening in both genders.
LEVEL OF EVIDENCE: 4.
Authors:
Lucinda E Bouillon; Jacqueline Wilhelm; Patricia Eisel; Jessica Wiesner; Megan Rachow; Lindsay Hatteberg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of sports physical therapy     Volume:  7     ISSN:  2159-2896     ISO Abbreviation:  Int J Sports Phys Ther     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-01-14     Completed Date:  2013-01-15     Revised Date:  2013-05-30    
Medline Journal Info:
Nlm Unique ID:  101553140     Medline TA:  Int J Sports Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  595-605     Citation Subset:  -    
Affiliation:
The University of Findlay, Findlay, OH, USA.
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