The effect of maturation on the accuracy of the 20m Shuttle Run test (20mSRT)
University of Wales Institute Cardiff
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The aim of this study was to assess whether the maturational status of the participant affects the accuracy of the 20mSRT at estimating maximal/peak oxygen consumption (peak O2, ml·kg¯¹·min¯¹). Eleven pre-pubertal, male secondary school pupils aged 12.2 (± 0.4) years (P1), and 7 post-pubertal, male, young adults aged 21.0 (± 1.1) years (P2) participated in the study. Each subject performed the 20mSRT individually whilst wearing a portable gas analysing system attached to an upper body harness which recorded their peak O2. High significant (P > 0.05) correlations between measured and estimated peak O2 were found in both groups (P1 r = 0.849, P2 r = 0.817) however, both mean estimated values (P1, 36.34 ± 5.42 ml·kg¯¹·min¯¹ and P2, 49.92 ± 4.80 ml·kg¯¹·min¯¹) were significantly lower (25.8% and 9%, respectively) than measured peak O2 (P1, 48.98 ± 6.54 ml·kg¯¹·min¯¹ and P2 54.84 ± 3.70 ml·kg¯¹·min¯¹). It was concluded that the maturational status of the participant does affect the accuracy of the 20mSRT at estimating peak O2. The 20mSRT underestimates values (ml·kg¯¹·min¯¹) in both groups but significantly more in pre-pubertal children than in young adults. Therefore, although the 20mSRT can provide an indication of aerobic fitness the use of it to assign peak O2 values (ml·kg¯¹·min¯¹) in pre-pubertal children should be cautioned.
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