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Acute Effects Of Dynamic Stretching On Peak And End-Range Functional Hamstring/Quadriceps Strength Ratios

U. Şekir, R. Arabacı, B. Akova
Published 2010 · Medicine

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ABS TRACT Ob jec ti ve: Alt ho ugh re cent stu di es ha ve shown that dyna mic stretc hing may im pro ve in di vi du al musc le strength per for man ce, its ef fects on the func ti o nal hamstring/quadriceps (H/Q) strength ra ti o and thus on in jury risk cha rac te ris tics has not be en in ves ti ga ted in depth. The aim of this study was to as sess the ef fects of dyna mic stretc hing on func ti o nal H/Q strength ra ti os for iso ki ne tic kne e ex ten si on and fle xi on at pe ak and end ran ge mo ments in eli te wo men ath le tes. Ma te ri al and Met hods: A to tal of twel ve he althy eli te com pe ti ti ve fe ma le ath le tes (me an age 20 ± 2 ye ars, me an he ight 166 ± 6 cm, me an we ight 58 ± 7 kg) vo lun te e red to par ti ci pa te in the study. All sub jects comp le ted a non-stretc hing (con trol) or a dyna mic stretc hing in ter ven ti on pro to col in a ran do mi zed fas hi on on se pa ra te days. The qu ad ri ceps and hams tring musc les we re stretc hed du ring the se pro to cols. Be fo re (pre) and af ter (post) the in ter ven ti on, the func ti o nal H/Q strength ra ti o was cal cu la ted at 60°•s-1 and 180°•s-1 an gu lar ve lo ci ti es. Re sults: The strength ra ti o for kne e ex ten si on disp la yed a sig ni fi cant in cre a se and for kne e fle xi on a sig ni fi cant dec re a se fol lo wing dyna mic stretc hing du ring the en ti re and end ran ge of mo ti on at both an gu lar ve lo ci ti es (p< 0.05). Conc lu si on: The ef fects of dyna mic stretc hing on func ti o nal H/Q strength ra ti os sug gest that the func ti o nal H/Q ra ti o do chan ge po si ti vely fol lo wing a dyna mic stretc hing ro u ti ne.
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