The major findings of the study can be concluded in the following head-points: - Hamstring static and dynamic stretching enhanced the hip flexion range of motion with neither impairment nor facilitation in isokinetic concentric knee flexion force at slow velocity. - Static stretching of lower extremities influences subsequent horizontal and vertical jumping performances with fast and slow stretch shortening cycle (in triple -hop and countermovement jump) negatively. - Muscle activities remained unchanged in the stretched muscles (in the third study). Thus, reductions in performance after static stretching in the current study could not be attributed to the decrement of the muscle activity as some authors r eported. - The mechanisms in which static stretching affects the jump performance were possibly due to changes in musculotendinous unit properties. - When athlete can not relinquish practicing static stretching, the stretch exercises must be followed by compensating procedures to restore performance-deficits. - Three sets of eight dynamic half squat or three sets of four weighted jumps with light loads and explosive executions could compensate these performance deficits. - The mechanisms in which the dynamic half squat or the weighted jumps improve subsequent performance were mostly due to postactivation potentiation and may also be attributed to the restoring of altered properties of musculotendinous unit following static stretching. - The implication of static stretching in the warm-up must only be performed when followed with a suitable compensatorical procedure just like weighted jumps or dynamic half squat. - Dynamic stretching would better suit than static stretching to be integrated in the warm-up as many previous investigations have suggested. - Finally, in athletes´ every day sport life individual decisions are the consequences.
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