The purpose of the study was to investigate the acute effects of two stretching interventions proprioceptive neuromuscular,, Facilitation (PNF) and passive static stretching (PSS), and a specific warm-up (SW) on the strength and architecture of. The vastus laterallis and biceps femoris muscles in a subsequent performance on strength training session (STS). Musculoskeletal. Ultrasound images were acquired from nine men before and immediately after stretchings or SW and ten, minutes after STS.? The STS consisted of the following exercises: Leg Extension Leg, Press, Curl Leg and Hack Machine Squat. The PNF resulted. In lower performance for all situations. The PSS and SW improved performance for the Leg Press relative to the PNF and controls. (CS). For the Hack Machine Squat the SW, resulted in higher performance than the stretching conditions. The VL muscle fascicle. Length (FL) increase after STS for PNF method. The BF muscle showed a higher pennation angle (PA) 10 minutes after the STS. For, PSS method the FL increases imediatally after PSS and than decrease 10 minutes after the STS for PSS method. As our. Results the SW, should be performed, before STS and PNF stretching should not be prescribed because this condition impairs. Subsequent performance. These results may assist health professionals in prescribing resistance training.
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