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Reliability and differences in quadriceps femoris muscle morphology using ultrasonography: The effects of body position and rest time
Journal article   Open access

Reliability and differences in quadriceps femoris muscle morphology using ultrasonography: The effects of body position and rest time

Patrick M Tomko, Tyler Wd Muddle, Mitchel A Magrini, Ryan J Colquhoun, Micheal J Luera and Nathaniel Dm Jenkins
Ultrasound (Leeds, England), Vol.26(4), pp.214-221
11/2018
DOI: 10.1177/1742271X18780127
PMCID: PMC6243455
PMID: 30479636
url
https://doi.org/10.1177/1742271X18780127View
Published (Version of record) Open Access

Abstract

The purpose of this investigation was to: (1) to determine the reliability of rectus femoris muscle cross-sectional area and echo intensity obtained using panoramic ultrasound imaging during seated and supine lying positions before and after a 5-minute rest period and (2) to determine the influence of body position and rest period on the magnitude of rectus femoris muscle cross-sectional area and echo intensity measurements. A total of 23 males and females (age = 21.5 ± 1.9 years) visited the laboratory on two separate occasions. During each visit, panoramic ultrasound images of the rectus femoris were obtained in both a seated and a supine position before (T1) and after a 5-minute (T2) rest period to quantify any potential changes in either muscle cross-sectional area and/or echo intensity. None of the muscle cross-sectional area or echo intensity measurements exhibited systematic variability, and the ICCs were 0.98-0.99 and 0.88-0.91, and the coefficients of variation were ≤ 3.9% and ≤ 8.2% for muscle cross-sectional area and echo intensity, respectively. Our results indicated that muscle cross-sectional area was greater in the seated than supine position, whereas echo intensity was greater in the supine position. Further, echo intensity increased in the seated position from T1 to T2. Both rectus femoris muscle cross-sectional area and echo intensity may be reliably measured in either a seated or supine lying position before or after a 5-minute rest period. Aside from echo intensity in the seated position, rest period had no influence on the magnitude of muscle cross-sectional area or echo intensity. Comparison of muscle cross-sectional area values that are obtained in different body positions is ill-advised.
 fluid re-distribution bi-articular muscle muscle architecture Panoramic ultrasound imaging reproducibility

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