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Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging
BACKGROUND: Quadriceps function is an important measure in patients recovering postoperatively. Traditionally, strength measures that require high levels of resistance are contraindicated during the early postoperative phase. Thus it may be helpful to evaluate the utilization of other tools, such as...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
SAGE Publications
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4137677/ https://www.ncbi.nlm.nih.gov/pubmed/25177424 http://dx.doi.org/10.1177/1941738114539450 |
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author | Martinez, Corina Davis, Ashley Myers, Heather Butler, Robert J. |
author_facet | Martinez, Corina Davis, Ashley Myers, Heather Butler, Robert J. |
author_sort | Martinez, Corina |
collection | PubMed |
description | BACKGROUND: Quadriceps function is an important measure in patients recovering postoperatively. Traditionally, strength measures that require high levels of resistance are contraindicated during the early postoperative phase. Thus it may be helpful to evaluate the utilization of other tools, such as ultrasound imaging, that allow for assessment during a position of low resistance. HYPOTHESIS: The rectus femoris cross-sectional area (CSA) is affected by sex and body composition in healthy subjects. STUDY DESIGN: Cross-sectional study. LEVEL OF EVIDENCE: Level 4. METHODS: Thirty-two healthy subjects (16 women, 16 men), selected from a previously larger study, were chosen for analysis. All subjects underwent a maximal volitional isometric contraction protocol from 0° to 90° of knee motion controlled by an isokinetic dynamometer. In the contracted and resting positions, the rectus femoris CSA was measured at each angle using ultrasound imaging. The contractile index (contracted − resting CSA) was calculated at each position. Subjects were separated into 1 of 4 groups based on sex and fat percentage (low or high). These data were analyzed using mixed-factor analysis of variance (group × angle) for each variable, with a critical α level of 0.05. RESULTS: A significant interaction was noted for the CSA of the rectus femoris at rest (P < 0.03) and during contraction (P < 0.02). For both variables, all groups performed similarly, with the exception of women with high body fat percentage. No statistically significant interaction existed for the contractile index; however, a main effect for angle (P < 0.01) was observed. CONCLUSION: Rectus femoris CSA appears to depend on sex as well as the body composition of individuals. CLINICAL RELEVANCE: Traditional subjective assessment measures of quadriceps strength and function have low reliability and functional validity. With the improved feasibility of ultrasound imaging in the clinical setting, quadriceps size may be more accurately measured during the early postoperative stages. |
format | Online Article Text |
id | pubmed-4137677 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | SAGE Publications |
record_format | MEDLINE/PubMed |
spelling | pubmed-41376772015-09-01 Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging Martinez, Corina Davis, Ashley Myers, Heather Butler, Robert J. Sports Health Imaging BACKGROUND: Quadriceps function is an important measure in patients recovering postoperatively. Traditionally, strength measures that require high levels of resistance are contraindicated during the early postoperative phase. Thus it may be helpful to evaluate the utilization of other tools, such as ultrasound imaging, that allow for assessment during a position of low resistance. HYPOTHESIS: The rectus femoris cross-sectional area (CSA) is affected by sex and body composition in healthy subjects. STUDY DESIGN: Cross-sectional study. LEVEL OF EVIDENCE: Level 4. METHODS: Thirty-two healthy subjects (16 women, 16 men), selected from a previously larger study, were chosen for analysis. All subjects underwent a maximal volitional isometric contraction protocol from 0° to 90° of knee motion controlled by an isokinetic dynamometer. In the contracted and resting positions, the rectus femoris CSA was measured at each angle using ultrasound imaging. The contractile index (contracted − resting CSA) was calculated at each position. Subjects were separated into 1 of 4 groups based on sex and fat percentage (low or high). These data were analyzed using mixed-factor analysis of variance (group × angle) for each variable, with a critical α level of 0.05. RESULTS: A significant interaction was noted for the CSA of the rectus femoris at rest (P < 0.03) and during contraction (P < 0.02). For both variables, all groups performed similarly, with the exception of women with high body fat percentage. No statistically significant interaction existed for the contractile index; however, a main effect for angle (P < 0.01) was observed. CONCLUSION: Rectus femoris CSA appears to depend on sex as well as the body composition of individuals. CLINICAL RELEVANCE: Traditional subjective assessment measures of quadriceps strength and function have low reliability and functional validity. With the improved feasibility of ultrasound imaging in the clinical setting, quadriceps size may be more accurately measured during the early postoperative stages. SAGE Publications 2014-09 /pmc/articles/PMC4137677/ /pubmed/25177424 http://dx.doi.org/10.1177/1941738114539450 Text en © 2014 The Author(s) |
spellingShingle | Imaging Martinez, Corina Davis, Ashley Myers, Heather Butler, Robert J. Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging |
title | Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging |
title_full | Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging |
title_fullStr | Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging |
title_full_unstemmed | Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging |
title_short | Interaction of Gender and Body Composition on Rectus Femoris Morphology as Measured With Musculoskeletal Ultrasound Imaging |
title_sort | interaction of gender and body composition on rectus femoris morphology as measured with musculoskeletal ultrasound imaging |
topic | Imaging |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4137677/ https://www.ncbi.nlm.nih.gov/pubmed/25177424 http://dx.doi.org/10.1177/1941738114539450 |
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