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The 20 m shuttle run is not a valid test of cardiorespiratory fitness in boys aged 11-14 years.

Jo WelsmanNeil Armstrong
Published in: BMJ open sport & exercise medicine (2019)
The 20mSRT reflects fatness rather than CRF and has poor validity grounded in its flawed estimation and interpretation of peak V ˙ O 2 in mL/kg/min.
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