scholarly journals Reliability of Repeated Trials Protocols for Body Composition Assessment by Air Displacement Plethysmography

2021 ◽  
Vol 18 (20) ◽  
pp. 10693
Author(s):  
Paul Muntean ◽  
Monica Micloș-Balica ◽  
Anca Popa ◽  
Adrian Neagu ◽  
Monica Neagu
Keyword(s):  
Fat Free Mass ◽  
Minimal Detectable Change ◽  
Detectable Change ◽  
Altman Analysis ◽  
Body Composition Assessment ◽  
Air Displacement Plethysmography ◽  
Bland Altman Analysis ◽  
Multiple Trials ◽  
Test Result ◽  
Error Of Measurement

Air displacement plethysmography (ADP) is fast, accurate, and reliable. Nevertheless, in about 3% of the cases, standard ADP tests provide rogue results. To spot these outliers and improve precision, repeated trials protocols have been devised, but few works have addressed their reliability. This study was conducted to evaluate the test–retest reliabilities of two known protocols and a new one, proposed here. Ninety-two healthy adults (46 men and 46 women) completed six consecutive ADP tests. To evaluate the reliability of single measurements, we used the results of the first two tests; for multiple measures protocols, we computed the test result from trials 1–3 and the retest result from trials 4–6. Bland–Altman analysis revealed that the bias and the width of the 95% interval of agreement were smaller for multiple trials than for single ones. For percent body fat (%BF)/fat-free mass, the technical error of measurement was 1% BF/0.68 kg for single trials and 0.62% BF/0.46 kg for the new protocol of multiple trials, which proved to be the most reliable. The minimal detectable change (MDC) was 2.77% BF/1.87 kg for single trials and 1.72% BF/1.26 kg for the new protocol.

scholarly journals Reliability of body composition assessment using A-mode ultrasound in a heterogeneous sample

2020 ◽  
Author(s):  
Monica Miclos-Balica ◽  
Paul Muntean ◽  
Falk Schick ◽  
Horia G. Haragus ◽  
Bogdan Glisici ◽  
...  
Keyword(s):  
Body Composition ◽  
Intraclass Correlation ◽  
Subcutaneous Fat ◽  
Minimal Detectable Change ◽  
Technical Error ◽  
Detectable Change ◽  
Body Composition Assessment ◽  
Entire Sample ◽  
Heterogeneous Sample ◽  
Error Of Measurement

Abstract Background/Objectives Several studies have addressed the validity of ultrasound (US) for body composition assessment, but few have evaluated its reliability. This study aimed to determine the reliability of percent body fat (%BF) estimates using A-mode US in a heterogeneous sample. Subjects/Methods A group of 144 healthy adults (81 men and 63 women), 30.4 (10.1) years (mean (SD)), BMI 24.6 (4.7) kg/m2, completed 6 consecutive measurements of the subcutaneous fat layer thickness at 8 anatomical sites. The measurements were done, alternatively, by two testers, using a BodyMetrix™ instrument. To compute %BF, 4 formulas from the BodyView™ software were applied: 7-sites Jackson and Pollock, 3-sites Jackson and Pollock, 3-sites Pollock, and 1-point biceps. Results The formula with the most anatomic sites provided the best reliability quantified by the following measures: intraclass correlation coefficient (ICC) = 0.979 for Tester 1 (T1) and 0.985 for T2, technical error of measurement (TEM) = 1.07% BF for T1 and 0.89% BF for T2, and minimal detectable change (MDC) = 2.95% BF for T1, and 2.47% BF for T2. The intertester bias was −0.5% BF, whereas the intertester ICC was 0.972. The intertester MDC was 3.43% BF for the entire sample, 3.24% BF for men, and 3.65% BF for women. Conclusions A-mode US is highly reliable for %BF assessments, but it is more precise for men than for women. Examiner performance is a source of variability that needs to be mitigated to further improve the precision of this technique.

Body composition assessment in extreme obesity and after massive weight loss induced by gastric bypass surgery

2003 ◽  
Vol 284 (6) ◽  
pp. E1080-E1088 ◽  
Author(s):  
Sai Krupa Das ◽  
Susan B. Roberts ◽  
Joseph J. Kehayias ◽  
Jack Wang ◽  
L. K. George Hsu ◽  
...  
Keyword(s):  
Weight Loss ◽  
Gastric Bypass ◽  
Body Composition ◽  
Reference Method ◽  
Fat Free Mass ◽  
Extreme Obesity ◽  
Body Composition Assessment ◽  
Air Displacement Plethysmography ◽  
Time Points ◽  
3C Model

Body composition methods were examined in 20 women [body mass index (BMI) 48.7 ± 8.8 kg/m2] before and after weight loss [−44.8 ± 14.6 (SD) kg] after gastric bypass (GBP) surgery. The reference method, a three-compartment (3C) model using body density by air displacement plethysmography and total body water (TBW) by H2 18O dilution (3C-H2 18O), showed a decrease in percent body fat (%BF) from 51.4 to 34.6%. Fat-free mass hydration was significantly higher than the reference value (0.738) in extreme obesity (0.756; P < 0.001) but not after weight reduction (0.747; P = 0.16). %BF by H2 18O dilution and air displacement plethysmography differed significantly from %BF by 3C-H2 18O in extreme obesity ( P< 0.05) and 3C models using 2H2O or bioelectrical impedance analysis (BIA) to determine TBW improved mean %BF estimates over most other methods at both time points. BIA results varied with the equation used, but BIA better predicted %BF than did BMI at both time points. All methods except BIA using the Segal equation were comparable to the reference method for determining changes over time. A simple 3C model utilizing air displacement plethysmography and BIA is useful for clinical evaluation in this population.

Validity of methods of body composition assessment in young and older men and women

1999 ◽  
Vol 86 (5) ◽  
pp. 1728-1738 ◽  
Author(s):  
J. L. Clasey ◽  
J. A. Kanaley ◽  
L. Wideman ◽  
S. B. Heymsfield ◽  
C. D. Teates ◽  
...  
Keyword(s):  
Body Composition ◽  
Confidence Intervals ◽  
Total Error ◽  
Estimation Methods ◽  
Older Individuals ◽  
Altman Analysis ◽  
Body Composition Assessment ◽  
Bland Altman Analysis ◽  
Hydrostatic Weighing ◽  
Mean Differences

We examined the validity of percent body fat (%Fat) estimation by two-compartment (2-Comp) hydrostatic weighing (Siri 2-Comp), 3-Comp dual-energy X-ray absorptiometry (DEXA 3-Comp), 3-Comp hydrostatic weighing corrected for the total body water (Siri 3-Comp), and anthropometric methods in young and older individuals ( n = 78). A 4-Comp model of body composition served as the criterion measure of %Fat (Heymsfield 4-Comp; S. B. Heymsfield, S. Lichtman, R. N. Baumgartner, J. Wang, Y. Kamen, A. Aliprantis, and R. N. Pierson Jr., Am. J. Clin. Nutr. 52: 52–58, 1990.). Comparison of the Siri 3-Comp with the Heymsfield 4-Comp model revealed mean differences of ≤0.4 %Fat, r values ≥ r = 0.997, total error values ≤ 0.85 %Fat, and 95% confidence intervals (Bland-Altman analysis) of ≤1.7 %Fat. Comparison of Siri 2-Comp, DEXA, and anthropometric models with the Heymsfield 4-Comp revealed that total error scores ranged from ±4.0 to ±10.7 %Fat, and 95% confidence intervals associated with the Bland-Altman analysis ranged from ±5.1 to ±15.0 %Fat. We conclude that the Siri 3-Comp model provides valid and accurate body composition data when compared with a 4-Comp criterion model. However, the individual variability associated with the Siri 2-Comp, DEXA 3-Comp, and anthropometric models may limit their use in research settings. The use of anthropometric estimation methods resulted in large mean differences and a considerable amount of interindividual variability. These data suggest that the use of these techniques should be viewed with caution.

Determining Meaningful Changes in Pelvic-On-Femoral Position during the Trendelenburg Test

2007 ◽  
Vol 16 (4) ◽  
pp. 326-335 ◽  
Author(s):  
James W. Youdas ◽  
Sara T. Mraz ◽  
Barbara J. Norstad ◽  
Jennifer J. Schinke ◽  
John H. Hollman
Keyword(s):  
Outcome Measures ◽  
Simple Procedure ◽  
Minimal Detectable Change ◽  
Detectable Change ◽  
Lower Extremity Injuries ◽  
Single Leg Stance ◽  
Hip Abductor ◽  
Extremity Injuries ◽  
Standard Error Of Measurement ◽  
Error Of Measurement

Context:Hip abductor muscle weakness is related to many lower extremity injuries. A simple procedure, the Trendelenburg test, may be used to assess hip abductor performance in patient populations.Objective:To describe the minimal detectable change (MDC) in pelvic-on-femoral (P-O-F) position of the stance limb during the Trendelenburg test.Setting:Laboratory.Participants:45 healthy women (28 ± 8 years) and 45 healthy men (33 ± 11 years).Main Outcome Measures:P-O-F position in degrees in single-leg stance. Results: Baseline P-O-F position (hip adduction) was 83° ± 3° with a range from 76° to 94°. The intratester reliability (ICC3,1 for measurement of P-O-F position using a universal goniometer was 0.58 with a standard error of measurement (SEM) of 2°. The minimal detectable change (MDC) was calculated to be 4°.Conclusions:If a person’s P-O-F position changes less than 4° between measurements, then the P-O-F position is within measurement error and it can be determined that there has been no change in the performance of the hip abductor muscles when examined by the Trendelenburg test.

scholarly journals Test–Retest Reliability of a Conventional Gait Model for Registering Joint Angles during Initial Contact and Toe-Off in Healthy Subjects

2021 ◽  
Vol 18 (3) ◽  
pp. 1343
Author(s):  
Francisco Molina-Rueda ◽  
Pilar Fernández-González ◽  
Alicia Cuesta-Gómez ◽  
Aikaterini Koutsou ◽  
María Carratalá-Tejada ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Intraclass Correlation ◽  
Minimal Detectable Change ◽  
Initial Contact ◽  
Altman Analysis ◽  
Joint Angles ◽  
Retest Reliability ◽  
Bland Altman Analysis ◽  
Motion System ◽  
Test Retest Reliability

The aim of this study was to evaluate the test–retest reliability of a conventional gait model (CGM), the Plug-in Gait model, to calculate the angles of the hip, knee, and ankle during initial contact (IC) and toe-off (TO). Gait analysis was performed using the Vicon Motion System® (Oxford Metrics, Oxford, UK). The study group consisted of 50 healthy subjects. To evaluate the test–retest reliability, the intraclass correlation coefficient (ICC), the standard error of measurement (SEM), the minimal detectable change (MDC), and the Bland–Altman analysis with 95% limits of agreement were calculated. The ICC for the joint angles of the hip, knee, and ankle was higher than 0.80. However, the ankle angle at IC had an ICC lower than 0.80. The SEM was <5° for all parameters. The MDC was large (>5°) for the hip angle at IC. The Bland–Altman analysis indicated that the magnitude of divergence was between ±5° and ±9° at IC and around ±7° at TO. In conclusion, the ICC for the plug-in gait model was good for the hip, knee, and ankle angles during IC and TO. The plots revealed a disagreement between measurements that should be considered in patients’ clinical assessments.

scholarly journals Cross-cultural adaptation and psychometric evaluation of the Yoruba version of Oswestry disability index

2019 ◽  
Author(s):  
Chidozie Emmanuel Mbada ◽  
Oluwabunmi Esther Oguntoyinbo ◽  
Francis Oluwafunso Fasuyi ◽  
Opeyemi Ayodiipo Idowu ◽  
Adesola Christiana Odole ◽  
...  
Keyword(s):  
Back Pain ◽  
Psychometric Properties ◽  
Factor Structure ◽  
Minimal Detectable Change ◽  
Low Back ◽  
Detectable Change ◽  
Intra Class Correlation ◽  
Test Retest Reliability ◽  
Standard Error Of Measurement ◽  
Error Of Measurement

AbstractIntroductionLow Back Pain is a common public health problem worsened by maladaptive beliefs and incongruent back pain behaviour. It is imperative to develop outcome measures to assess these beliefs among patients with chronic LBP. This study aimed to cross-culturally adapt and determine the psychometric properties of the Yoruba version of the ODI (ODI-Y).MethodsThe ODI-Y was cross-culturally adapted following the process involving forward translation, synthesis, backward translation, expert review, and pilot testing. One hundred and thirty-six patients with chronic LBP took part in the validation of the ODI-Y; 86 of these individuals took part in the test-retest reliability (within 1-week interval) of the translated instrument. Internal consistency and test-retest reliability of the ODI-Y were determined using the Cronbach’s alpha and intra-class correlation. Other psychometric properties explored included the factor structure and fit, convergent validity, standard error of measurement and the minimal detectable change.ResultsThe mean age of the respondents was 50.5±10.6years. The ODI-Y showed a high internal consistency, with a Cronbach’s alpha (α) of 0.81. Test-retest of the Yoruba version of the ODI within 1-week interval yielded an Intra-Class Correlation coefficient of 0.89. The ODI-Y yielded a two-factor structure which accounted for 51.7% of the variance but showed poor fit. Convergent of ODI-Y with the visual analogue scale was moderate (r=0.30; p=0.00). The standard error of measurement and minimal detectable change of the ODI-Y were 2.0 and 5.5.ConclusionsThe ODI was adapted into the Yoruba language and proved to have a good factor structure and psychometric properties that replicated the results of other obtainable versions. We recommend it for use among Yoruba speaking patients with low-back pain.

scholarly journals Effect of Thoracic Gas Volume Changes on Body Composition Assessed by Air Displacement Plethysmography after Rapid Weight Loss and Regain in Elite Collegiate Wrestlers

Sports ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 48 ◽  
Author(s):  
Emi Kondo ◽  
Keisuke Shiose ◽  
Yosuke Yamada ◽  
Takuya Osawa ◽  
Hiroyuki Sagayama ◽  
...  
Keyword(s):  
Weight Loss ◽  
Body Composition ◽  
Fat Free Mass ◽  
Dilution Method ◽  
Rapid Weight Loss ◽  
Body Composition Assessment ◽  
Air Displacement Plethysmography ◽  
Time Points ◽  
Thoracic Gas Volume ◽  
Gas Volume

We investigated the effect of rapid weight loss (RWL) and weight regain (WR) on thoracic gas volume (VTG) and body composition assessment using air displacement plethysmography (ADP) in male wrestlers. Eight male elite collegiate wrestlers completed a RWL regimen (6% of body mass) over a 53-h period, which was followed by a 13-h WR period. ADP was used at three time points (baseline (T1), post-RWL (T2) and post-WR (T3)) according to the manufacturer’s testing recommendations. The total body water and bone mineral content were estimated using the stable isotope dilution method and dual energy X-ray absorptiometry, respectively, at the same time points. Body composition was assessed with two-component (2C) or four-component (4C) models using either the measured VTG (mVTG) or predicted VTG (pVTG). Measured VTG increased from T1 to T2 (0.36 ± 0.31 L, p < 0.05) and decreased from T2 to T3 (−0.29 ± 0.15 L, p < 0.01). However, the changes in fat mass and fat free mass, which were calculated by both 2C and 4C models, were not significantly different when compared between calculations using mVTG and those using pVTG. Our results indicate that VTG significantly changes during RWL and WR, but both measured and predicted VTG can be used to assess changes in body composition during RWL and WR.

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