Accuracy of the 20-m shuttle run test for individualizing exercise intensity of high-intensity interval training<b />

The aim of the study was to investigate accuracy 20 m shuttle run test (20mSRT) for prescription high-intensity interval training (HIIT) and examine appropriate intensity, prescribed by 20mSRT end-test speed, execution HIIT. Twenty physical education students (age: 22.4 ± 0.8 years, body height: 175.7 8.9 cm, weight: 73.8 13.4 kg) participated in study. On two separate occasions participants were first tested with a maximal incremental exercise 20mSRT. another they required perform 10-minute HIIT session comprised 15-s runs interspersed passive recovery. intensities sessions either 100% (T100%) or 110% (T110%) speed reached Mean oxygen uptake (VO2) (84.4 5.5% vs 77.8 6.9% VO2max), mean heart rate (HR) (93 2.8% 87.6 4.6% HRmax), blood lactate concentration (12.6 2.1 5.4 2.6 mmol/l), ratings perceived exertion (9.5 0.5 6.7 1) all significantly (p&amp;lt;.01) higher during T110% T100%. percentage total time spent ≥ 90% VO2max (37.6 25.3 18.6 18.0%, p&amp;lt;.05) HRmax (73.9 17.7% 37.5 33.3, p&amp;lt;.001) also T110%. VO2 HR coefficient variation 6.5 3%, respectively. cardiorespiratory, metabolic, perceptual responses reflective typical HIIT, while T100% induced insufficient physiological stress enable optimal cardiorespiratory adaptation. Therefore, intensity is preferable inducing acute can be used accurately prescribe