The influence of subcutaneous fat on the relationship between body composition and ultrasound-derived muscle quality

2016 ◽  
Vol 41 (10) ◽  
pp. 1104-1107 ◽  
Author(s):  
Eric D. Ryan ◽  
Nicholas W. Shea ◽  
Gena R. Gerstner ◽  
Timothy J. Barnette ◽  
Andrew J. Tweedell ◽  
...  
Keyword(s):  
Body Composition ◽  
Subcutaneous Fat ◽  
Muscle Quality ◽  
Echo Intensity ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
Total Fat ◽  
The Relationship

Ultrasound echo intensity (EI) values are a popular assessment of muscle quality. The relationship between EI and total (%fat) and regional (%fatlimb) body composition was examined in 40 men, prior to and after accounting for subcutaneous fat thickness. Uncorrected EI values suggest that muscle quality improves (r = –0.329 to –0.224; P = 0.038–0.165) with greater %fat and %fatlimb. However, corrected EI values indicated that muscle quality decreases (r = 0.711 to 0.798; P < 0.001) with greater %fat and %fatlimb.

EXAMINATION OF THE CONFOUNDING EFFECT OF SUBCUTANEOUS FAT ON MUSCLE ECHO INTENSITY UTILIZING EXOGENOUS FAT

2020 ◽  
Author(s):  
Jonathan Neto Müller ◽  
Fábio Juner Lanferdini ◽  
Juliana Yasmin Passos Karam ◽  
Heiliane de Brito Fontana
Keyword(s):  
Tibialis Anterior Muscle ◽  
Subcutaneous Fat ◽  
Region Of Interest ◽  
Muscle Quality ◽  
Focus Position ◽  
Echo Intensity ◽  
Confounding Effect ◽  
Muscle Region ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness

We aimed to provide an unbiased estimate of the confounding effect of subcutaneous fat thickness on ultrasound echo intensity (EI) measures of muscle quality. The effect of fat thickness on EI was verified for an approximate range of 0 to 3 cm of fat using exogeneous layers of pork fat over the human tibialis anterior muscle. Sonograms were obtained i) with focus constant across fat thickness conditions and ii) with focus position adjusted to the muscle region of interest (ROI) position for each fat thickness level. In agreement with our hypothesis, increasing fat between the probe and the ROI resulted in a decrease in EI. This overestimating effect of fat on muscle quality differs between sonograms with constant focus and sonograms with focus position adjusted to the vertical displacement in ROI position that occurs for different levels of fat thickness. Correcting equations to account for the overestimating effect of fat on muscle quality are provided for both focus conditions. This is the first study to systematically analyze the confounding effect of fat thickness as an independent factor and the provided equations can be used for improved accuracy in estimates of muscle quality in obese/overweight subjects/patients. NOVELTY • The independent confounding effect of subcutaneous fat thickness on US estimates of muscle quality was quantified • US estimates of muscle quality depend on whether focus is adjusted to the muscle region of interest or not • Equations for correcting muscle quality estimates are provided

THE USE OF UREA DILUTION AND ULTRASONIC BACKFAT THICKNESS TO PREDICT THE CARCASS COMPOSITION OF LIVE LAMBS AND CATTLE

1982 ◽  
Vol 62 (2) ◽  
pp. 371-379 ◽  
Author(s):  
S. D. M. JONES ◽  
J. S. WALTON ◽  
J. W. WILTON ◽  
J. E. SZKOTNICKI
Keyword(s):  
Subcutaneous Fat ◽  
Carcass Composition ◽  
Multiple Regression Equation ◽  
Lean Tissue ◽  
Live Animal ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
Total Fat ◽  
The Relationship ◽  
Lean Weight

Thirty-eight lambs (22 rams, 16 ewes), 25 Holstein cows and 30 steers were evaluated ultrasonically for subcutaneous fat thickness. Urea space was also estimated, using the dilution principle, by a single injection of a known amount of urea and taking a single blood sample 12 min later. All lambs and cattle were slaughtered within 2 days and the half-carcasses were separated into fat, lean and bone. Urea space (R2 = 0.10) and fat thickness (R2 = 0.18) in lambs were poorly related to the weight of half-carcass lean tissue. Neither urea space nor fat thickness improved the level of explained variation in half-carcass lean tissue weight over that explained by liveweight alone (R2 = 0.73). Urea space showed a larger association with half carcass lean weight in cows (R2 = 0.55) than in steers (R2 = 0.14), but again did not improve the relationship provided by liveweight alone (R2 = 0.60). Fat thickness provided nonsignificant regressions (P < 0.05) with half-carcass lean weight both in cows and in steers. Liveweight was the dominant independent variable (R2 = 0.33) for predicting total fat in lamb half-carcasses; urea space (R2 = 0.08) and fat thickness (R2 = 0.13) did not improve the prediction given by liveweight alone. Fat thickness was poorly related to total fatness both in steers (R2 = 0.12) and in cows (nonsignificant regression). A multiple regression equation combining fat thickness and liveweight provided the best prediction of half-carcass fat in cows, whereas a similar equation with the addition of urea space gave the best prediction of half-carcass fat in steers. The measurement of urea space and fat thickness to predict the weight of carcass tissues (lean, fat) in live lambs and cattle over the weight (41.9 + 9.7 kg(SD) lambs, 624 ± 62.8 kg cows and 466 ± 63.2 kg steers) and fatness (19.9 ± 3.27% (SD) lambs, 21.9 ± 2.18% cows and 20.9 ± 3.98% steers) ranges studied was of limited value. Key words: Urea dilution, ultrasound, live animal evaluation, carcass composition

Variability of regional quadriceps echo intensity in active young men with and without subcutaneous fat correction

2020 ◽  
Vol 45 (7) ◽  
pp. 745-752 ◽  
Author(s):  
Dustin J. Oranchuk ◽  
Matt S. Stock ◽  
André R. Nelson ◽  
Adam G. Storey ◽  
John B. Cronin
Keyword(s):  
Vastus Lateralis ◽  
Intraclass Correlation ◽  
Subcutaneous Fat ◽  
Rectus Femoris ◽  
Muscle Quality ◽  
Echo Intensity ◽  
Vastus Intermedius ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
Myotendinous Junctions

Quantifying echo intensity (EI), a proposed measure of muscle quality, is becoming increasingly popular. Additionally, much attention has been paid to regional differences in other ultrasonically evaluated measures of muscle morphology and architecture. However, the variability of regional (proximal, middle, distal) EI of the vastus lateralis, rectus femoris, and lateral and anterior vastus intermedius has yet to be determined. Twenty participants (40 limbs), were evaluated on 3 occasions, separated by 7 days. Intersession variability of EI with and without subcutaneous fat correction was quantified. Furthermore, the interchangeability of corrected EI across regions was evaluated. Variability of regional quadriceps EI was substantially lower with subcutaneous fat correction (intraclass correlation coefficient (ICC) = 0.81–0.98, coefficient of variation (CV) = 4.5%–16.8%, typical error of measure (TEM) = 0.13–0.49) versus raw values (ICC = 0.69–0.98, CV = 7.7%–42.7%, TEM = 0.14–0.68), especially when examining the vastus intermedius (ICC = 0.81–0.95, CV = 7.1%–16.8%, TEM = 0.23–0.49 vs. ICC = 0.69–0.92, CV = 22.9%–42.7%, TEM = 0.31–0.68). With the exception of the rectus femoris and vastus intermedius (p ≥ 0.143, effect size (ES) ≤ 0.18), corrected EI was greater for proximal and distal regions when compared with the midpoint (p ≤ 0.038, ES = 0.38–0.82). Researchers and practitioners should utilize subcutaneous fat thickness correction to confidently evaluate EI at all regions of the quadriceps. Regional EI cannot be used interchangeably for the vastus muscles, likely because of an increase in fibrous content towards the myotendinous junctions. Novelty Regional quadriceps echo intensity was reliable with and without correction for subcutaneous fat thickness. Intersession variability of regional quadriceps echo intensity was substantially improved following subcutaneous fat correction. Quadriceps echo intensity increased towards myotendinous junctions in the vastus muscles.

Ultrasound Measurements of Subcutaneous Fat Thickness Are Robust Against Hydration Changes

2020 ◽  
pp. 1-6
Author(s):  
Dale R. Wagner ◽  
James D. Cotter
Keyword(s):  
Body Composition ◽  
Body Fat ◽  
Subcutaneous Fat ◽  
Hydration Status ◽  
Body Fat Percentage ◽  
Fat Percentage ◽  
Ultrasound Measurements ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
The Impact

Ultrasound is an appealing tool to assess body composition, combining the portability of a field method with the accuracy of a laboratory method. However, unlike other body composition methods, the effect of hydration status on validity is unknown. This study evaluated the impact of acute hydration changes on ultrasound measurements of subcutaneous fat thickness and estimates of body fat percentage. In a crossover design, 11 adults (27.1 ± 10.5 years) completed dehydration and hyperhydration trials to alter body mass by approximately ±2%. Dehydration was achieved via humid heat (40 °C, 60% relative humidity) with exercise, whereas hyperhydration was via ingestion of lightly salted water. Ultrasound measurements were taken at 11 body sites before and after each treatment. Participants lost 1.56 ± 0.58 kg (−2.0 ± 0.6%) during the dehydration trial and gained 0.90 ± 0.21 kg (1.2 ± 0.2%) during the hyperhydration trial even after urination. The sum of fat thicknesses as measured by ultrasound differed by <0.90 mm across trials (p = .588), and ultrasound estimates of body fat percentage differed by <0.5% body fat. Ultrasound measures of subcutaneous adipose tissue were unaffected by acute changes in hydration status by extents beyond which are rare and overtly self-correcting, suggesting that this method provides reliable and robust body composition results even when subjects are not euhydrated.

A note on the relationship between ultrasonic fat measurement and performance in beef cattle

1978 ◽  
Vol 27 (1) ◽  
pp. 109-112
Author(s):  
J. B. Moran ◽  
W. Holmes
Keyword(s):  
Subcutaneous Fat ◽  
Live Weight ◽  
Performance Parameters ◽  
Feed Conversion ◽  
Rate Of Increase ◽  
Breed Differences ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
And Performance ◽  
The Relationship

ABSTRACTThe development of subcutaneous fat as measured by ultrasonics was determined in 28 Angus, 46 Hereford and 42 Charolais bulls, performance-tested on a barley/grass diet. The ultrasonic fat measurements were then examined for possible relationships with feed intake, growth rate and feed conversion efficiency. There were apparent breed differences in the rate of increase in subcutaneous fat thickness with changing live weight but ultrasonic measurements bore little relationship to performance parameters within any of the three breeds tested.

scholarly journals A study on the relationship between subcutaneous fat thickness and serum cholesterol in three field surveys.

1990 ◽  
Vol 56 (2) ◽  
pp. 72-86
Author(s):  
Makiko TAKAYANAGI ◽  
Nobuhiro KUMAKURA ◽  
Hiroaki NISHIKAWA ◽  
Mika KIGAWA ◽  
Hiroshi TANUMA ◽  
...  
Keyword(s):  
Serum Cholesterol ◽  
Subcutaneous Fat ◽  
Field Surveys ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
The Relationship

Relationships between pre-slaughter rump flatness of Nelore cows and subsequent measures of carcass fatness

2019 ◽  
Vol 59 (7) ◽  
pp. 1382
Author(s):  
Luiz F. M. Pfeifer ◽  
Paulo M. A. Neves
Keyword(s):  
Linear Relationship ◽  
Subcutaneous Fat ◽  
Positive Linear Relationship ◽  
Internal Angle ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
The Relationship

This study aimed to evaluate the relationship between the internal angle of the rump (IAR), as a measure of rump fatness, and both the visual degree of finishing (VDF) and the subcutaneous fat thickness (SFT) of Nelore cows. In this study, 836 Nelore cows were examined. The IAR of all live cows was measured using a goniometer, and then the VDF of all carcasses was evaluated. Additionally, the SFT of a subset of carcasses (n = 225) was measured. Carcasses were divided into three groups based on the VDF, as follows: Inadequate VDF (I) for carcasses with a degree of finishing of 1 and 2; Adequate VDF (A) for carcasses with a degree of finishing of 3 and 4; and Excessive VDF (E) for carcasses with a degree of finishing of 5. There was a positive linear relationship between VDF and IAR (y = 98.29 + 5.78 × x; R 2 = 0.53; P &lt; 0.001) and between VDF and SFT (y = 0.26 + 0.51× x; R 2 = 0.51; P &lt; 0.001). Cows classified as having an Excessive degree of fatness according to the Inadequate – Adequate – Excessive (IAE) scale had higher IAR and SFT than cows classified as Inadequate or Adequate (P &lt; 0.001). Similarly, cows classified as Adequate had higher IAR and SFT than cows classified as Inadequate (P &lt; 0.001). These results demonstrate that the measure of IAR of a live Nelore cow can provide a good indication of the level of fatness of its carcass.

scholarly journals The Relationship between Balance, Muscles, and Anthropomorphic Features in Young Adults

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Ragıba Zagyapan ◽  
Cihan Iyem ◽  
Ayla Kurkcuoglu ◽  
Can Pelin ◽  
Mustafa Agah Tekindal
Keyword(s):  
Subcutaneous Fat ◽  
The Body ◽  
Thigh Circumference ◽  
Posture Analysis ◽  
Clinical Assessments ◽  
Significant Difference ◽  
Subcutaneous Fat Thickness ◽  
Fat Thickness ◽  
Lateral Posture ◽  
The Relationship

Posture can be defined as the form of the body when sitting, walking, or standing. There would be no problem if muscles interact in harmony with musculoskeletal system or nervous system. Posture analysis is crucial for clinical assessments in physical medicine and rehabilitation. However, studies into this issue are limited. In this study, the relationship between static standing balance and anthropomorphic features in healthy subjects was investigated. The study was carried out with a total of 240 students at Baskent University (116 females, 124 males) aged between 18 and 25 years. Type of balance of the subjects was determined with lateral posture analysis. Additionally, muscle shortness tests, subcutaneous fat thickness, and waist and thigh circumference were measured. As the results of lateral posture analysis, 107 subjects (71 males, 36 females) were detected to have anterior balance, 89 (41 males, 48 females) posterior balance, and 44 (12 males, 32 girls) neutral balance. Values of waist circumference, thigh circumference, and waist/thigh ratio were compared with all three balance types. A statistically significant difference was detected between these values in the subjects who had anterior balance (P<0.05). In conclusion, a significant relationship was detected between muscle shortness, waist and thigh circumferences, and postural balance type.

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