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00005768-200305001-0178400005768_2003_35_s322_escamilla_biomechanical_5miscellaneous< 19_0_5_0 >Medicine & Science in Sports & Exercise©2003The American College of Sports MedicineVolume 35(5) Supplement 1May 2003p S322BIOMECHANICAL ANALYSIS OF SUMO AND CONVENTIONAL DEADLIFTS IN FEMALES DURING THE SPECIAL OLYMPICS WORLD GAMES[G-15L FREE COMMUNICATION/POSTER BIOMECHANICAL PERFORMANCE ASSESSMENT]Escamilla, R F.1; Tonini, C D.1; Lai, I Y.1; Lowry, T M.1; Hreljac, A1; Imamura, R T.11Duke University Medical Center, Durham, NC, California State University, Sacramento, CA(Sponsor: James R. Andrews, FACSM)No known studies have yet investigated lifting biomechanics for mentally retarded female athletes. Improper lifting techniques may increase injury risks and decrease performance.PURPOSETo compare biomechanical parameters between sumo and conventional style deadlifts in female powerlifters during the Special Olympics World Games.METHODSTwo synchronized video cameras recorded 60 Hz video data on 16 female Special Olympic athletes while performing the deadlift. Anatomic landmarks were digitized, and kinematic and kinetic parameters were quantified at barbell liftoff (LO), barbell knee passing (KP), minimum barbell velocity (MBV), and lift completion (LC). Unpaired t-tests were used to assess comparisons between sumo (n=8) and conventional (n=8) groups.RESULTSCompared to the conventional group, the sumo group employed a greater stance width (66 cm versus 33 cm), had a smaller hand-to-hand width (48 cm versus 57 cm), turned their feet out more (29° versus 19°), and had less vertical shank angle at MBV (68° versus 79°). At LO, KP, MBV, and LC there were no significant differences in hip, knee, trunk, and thigh angles between the groups. The sumo group generated ankle dorsiflexor, knee extensor, and hip extensor moments at LO, KP, and LC, while the conventional group generated ankle plantar flexor, knee flexor moments, and hip extensor moments at LO, KP, and at LC. Ankle and knee moments were significantly different between the two groups.CONCLUSIONSWithin a group of Special Olympians the sumo deadlift may be more effective in ankle dorsiflexor and knee extensor recruitment, while the conventional deadlift may be more effective in ankle plantar flexor and knee flexor recruitment. Both the sumo and conventional deadlift appear equally effective in hip extensor recruitment. Joint and segment angle lifting mechanics were similar between sumo and conventional groups, with the primary kinematic differences being stance width, hand position, and foot angle position.BIOMECHANICAL ANALYSIS OF SUMO AND CONVENTIONAL DEADLIFTS IN FEMALES DURING THE SPECIAL OLYMPICS WORLD GAMESEscamilla, R F.; Tonini, C D.; Lai, I Y.; Lowry, T M.; Hreljac, A; Imamura, R T.G-15L Free Communication/Poster Biomechanical Performance Assessment535