Academic Journal
Developing a New Curvilinear Allometric Model to Improve the Fit and Validity of the 20-m Shuttle Run Test as a Predictor of Cardiorespiratory Fitness in Adults and Youth.
| Title: | Developing a New Curvilinear Allometric Model to Improve the Fit and Validity of the 20-m Shuttle Run Test as a Predictor of Cardiorespiratory Fitness in Adults and Youth. |
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| Authors: | Nevill, Alan M., Ramsbottom, Roger, Sandercock, Gavin, Bocachica-González, Carlos Eduardo, Ramírez-Vélez, Robinson, Tomkinson, Grant |
| Source: | Sports Medicine; Jul2021, Vol. 51 Issue 7, p1581-1589, 9p |
| Abstract: | Background and Objectives: Doubts have been raised concerning the validity of the 20-m shuttle-run test (20 mSRT) as a predictor of cardiorespiratory fitness (CRF) in youth based on Léger's equation/model. An alternative allometric model has been published recently that is thought to provide, not only a superior fit (criterion validity) but also a more biologically and physiologically interpretable model (construct validity). The purposes of this study were to explore whether allometry can provide a more valid predictor of CRF using 20 mSRT compared with Léger's equation/model. Methods: We fitted and compared Léger's original model and an alternative allometric model using two cross-sectional datasets (youth, n = 306; adult n = 105) that contained measurements of CRF ( V ˙ O 2 peak / V ˙ O 2max ) and 20 mSRT performance. Quality-of-fit was assessed using explained variance (R2) and Bland and Altman's limits of agreement. Results: The allometric models provided superior fits for the youth (explained variance R2 = 71.9%) and adult (R2 = 77.7%) datasets compared with Léger's equation using their original fixed (R2 = 35.2%) or re-estimated parameter models (R2 = 65.9%), confirming that the allometric models demonstrate acceptable criterion validity. However, the allometric models also identified a non-linear "J-shaped" increase in energy cost ( V ˙ O 2 peak / V ˙ O 2max ) with faster final shuttle-run speeds (fitted speed exponent = 1.52; 95% CI 1.38–1.65). Conclusion: Not only do allometric models provide more accurate predictions of CRF ( V ˙ O 2 peak / V ˙ O 2max ; ml kg−1 min−1) for both youth and adults (evidence of criterion validity), the "J-shaped" rise in energy demand with increasing final shuttle-run speed also provides the evidence of construct validity, resulting in a more plausible, physiologically sound, and interpretable model. [ABSTRACT FROM AUTHOR] |
| Subject Terms: | RELATIVE medical risk, RESEARCH evaluation, CONFIDENCE intervals, CARDIOPULMONARY fitness, ALLOMETRY, RESEARCH methodology evaluation, MATHEMATICAL models, CROSS-sectional method, ANTHROPOMETRY, RESPIRATORY measurements, WEARABLE technology, REGRESSION analysis, COMPARATIVE studies, THEORY, FORCED expiratory volume, ANALYSIS of covariance, DESCRIPTIVE statistics, DATA analysis software, ADOLESCENCE |
| Geographic Terms: | COLOMBIA |
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| ISSN: | 01121642 |
| DOI: | 10.1007/s40279-020-01346-0 |
| Database: | Complementary Index |