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 (\(\dot{V}{\text{O}}_{{2{\text{peak}}}}\)/\(\dot{V}{\text{O}}_{{{\text{2max}}}}\)) 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 (\(\dot{V}{\text{O}}_{{2{\text{peak}}}}\)/\(\dot{V}{\text{O}}_{{{\text{2max}}}}\)) 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 (\(\dot{V}{\text{O}}_{{2{\text{peak}}}}\)/\(\dot{V}{\text{O}}_{{{\text{2max}}}}\); 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.
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Acknowledgments
The authors gratefully acknowledge the contributions of postgraduate students (Jose Nelson Gil, Daniel Prieto, and Alejandra Hernandez) that carried out the implementation and data collection, and Jorge Enrique Correa-Bautista, PhD from CEMA-UR for excellent technical support for facilitating this study (Colombia Study). This article is part of the master thesis submitted by CEB-G, from the University of Rosario, Colombia.
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No financial support was received for the conduct of this study or preparation of this article.
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Alan Nevill, Roger Ramsbottom, Gavin Sandercock, Carlos Eduardo Bocachica-González, Robinson Ramírez-Vélez, and Grant Tomkinson have no conflicts of interest that are directly relevant to the content of this article.
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The study was approved by the Ethics Committee of the Rosario University Board (Code DVO005-1–383-CEI874).
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Data are available on request.
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AMN analyzed the data and drafted the manuscript. RR, CEB-G, RR-V, and GS designed the study, directed implementation, and data collection. AMN, RR, and GT edited the manuscript for intellectual content and provided critical comments on the manuscript.
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Nevill, A.M., Ramsbottom, R., Sandercock, G. et al. 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. Sports Med 51, 1581–1589 (2021). https://doi.org/10.1007/s40279-020-01346-0
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DOI: https://doi.org/10.1007/s40279-020-01346-0