Comparison of Body Composition Assessment Using Air-Displacement Plethysmography and A-Mode Ultrasound before and after a 12-Week Exercise Intervention in Normal Weight Adult Males
Bibliographic record
Abstract
Body composition (BC) is a valuable indicator of health and performance. Air-displacement plethysmography (ADP) is a popular, efficient, and reliable method for assessing BC. A-mode ultrasonography (AUS) is another method, and its affordability, mobility, and practicality make it a plausible device for industry and health professionals. This study assessed the cross-sectional and change relationships and agreements between AUS and ADP from a 12-week resistance exercise intervention designed to increase fat-free mass (FFM). BC was measured by both modalities pre/post-intervention. Twenty-nine normal weight males (age: 20.6 ± 2.2 years) participated. Both modalities tracked changes in FFM and % body fat (%BF) (∆ADP = 1.7 ± 1.5 kg, −0.4 ± 2.5%; ∆AUS = 2.4 ± 1.9 kg, −1.4 ± 2.1%; main effects for time p < .005, respectively), with no differences between modalities (interactions p > .05), and were moderately significantly correlated (r = 0.58 and r = 0.60, p < .01). Bland-Altman plots revealed no proportional biases. These devices tracked changes in FFM and %BF similarly over time. Future research should assess AUS at different levels of adiposity.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".