Criterion-related validity of sit-and-reach and toe-touch tests as a measure of hamstring extensibility in athletes
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The aims of this study were (a) to determine and compare the concurrent hamstring criterion- related validity of the sit-and-reach (SR) and toe-touch (TT) tests in different athletes (tennis players, kayakers, canoeists, and cyclists); (b) to determine the criterion-related validity of the pel- vic tilt assessed by the Spinal Mouse system as a measure of hamstring flexibility in athletes; and (c) to evaluate the influence of spinal posture, pelvic tilt, and hamstring muscle flexibility in the SR and TT scores. Twenty-four tennis players, 30 canoeists, 43 kayakers, and 44 cyclists were recruited. Passive straight leg raise (PSLR), SR, and TT tests were randomly performed. Spinal curvatures and pelvic tilt were evaluated with a Spinal Mouse system when the maximal trunk flexion was achieved in the SR and TT tests. Tennis players and cyclists showed moderate cor- relations between PSLR with respect to SR (b = 0.78 and b = 0.76, respectively) and TT (b = 0.77 and b = 0.74, respectively). C...