PAULO HENRIQUE MARCHETTI
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- Acute bouts of upper and lower body static and dynamic stretching increase non-local joint range of motion(2016) BEHM, David George; CAVANAUGH, Tyler; QUIGLEY, Patrick; REID, Jonathan Christopher; NARDI, Priscyla Silva Monteiro; MARCHETTI, Paulo HenriqueThere are conflicts in the literature concerning the crossover or non-local effects of stretching. The objective of this study was to evaluate whether static (SS) and dynamic (DS) stretching of the shoulders would affect hip flexor range of motion (ROM) and performance and reciprocally whether SS and DS of the lower body would affect shoulder extension ROM and performance. A randomized crossover study design examined the acute effects of upper and lower body SS and DS on lower and upper body performance measures, respectively. Experimental sessions included upper and lower body control tests, upper body (shoulder horizontal abduction) SS and lower body (hip abduction) SS, upper body (shoulder horizontal abduction and adduction) DS and lower body DS (hip abduction and adduction). Passive static and dynamic ROM (hip flexion, shoulder extension), leg flexor and elbow flexor maximal voluntary contraction isometric force, fatigue endurance and electromyography were measured. There were significant shoulder ROM increases following lower body SS (P < 0.010, a dagger % = 8.2 %) and DS (P < 0.019, a dagger % = 9 %). There was a significant hip flexor ROM (P < 0.016, a dagger % = 5.2 %) increase following upper body SS. There were no significant main effects or interactions for dynamic ROM or muscle force and activation variables. The lack of stretch-induced force and fatigue changes suggests that rather than a mechanical or neural drive mechanism, an enhanced stretch tolerance was likely the significant factor in the improved ROM.
article 25 Citação(ões) na Scopus Unilateral Plantar Flexors Static-Stretching Effects on Ipsilateral and Contralateral Jump Measures(2015) SILVA, Josinaldo Jarbas da; BEHM, David George; GOMES, Willy Andrade; SILVA, Fernando Henrique Domingues de Oliveira; SOARES, Enrico Gori; SERPA, Erica Paes; VILELA JUNIOR, Guanis de Barros; LOPES, Charles Ricardo; MARCHETTI, Paulo HenriqueThe aim of this study was to evaluate the acute effects of unilateral ankle plantar flexors static-stretching (SS) on the passive range of movement (ROM) of the stretched limb, surface electromyography (sEMG) and single-leg bounce drop jump (SBDJ) performance measures of the ipsilateral stretched and contralateral non-stretched lower limbs. Seventeen young men (24 +/- 5 years) performed SBDJ before and after (stretched limb: immediately post-stretch, 10 and 20 minutes and non-stretched limb: immediately post-stretch) unilateral ankle plantar flexor SS (6 sets of 45s/15s, 70-90% point of discomfort). SBDJ performance measures included jump height, impulse, time to reach peak force, contact time as well as the sEMG integral (IEMG) and pre-activation (IEMG(pre-activation)) of the gastrocnemius lateralis. Ankle dorsiflexion passive ROM increased in the stretched limb after the SS (pre-test: 21 +/- 4 degrees and post-test: 26.5 +/- 5 degrees, p < 0.001). Post-stretching decreases were observed with peak force (p = 0.029), IEMG (P < 0.001), and IEMG(pre-activation) (p = 0.015) in the stretched limb; as well as impulse (p = 0.03), and jump height (p = 0.032) in the non-stretched limb. In conclusion, SS effectively increased passive ankle ROM of the stretched limb, and transiently (less than 10 minutes) decreased muscle peak force and pre-activation. The decrease of jump height and impulse for the non-stretched limb suggests a SS-induced central nervous system inhibitory effect.