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   Influence of gender and muscle architecture asymmetry on jump and sprint performance  
   
نویسنده mangine g.t. ,fukuda d.h. ,lamonica m.b. ,gonzalez a.m. ,wells a.j. ,townsend j.r. ,jajtner a.r. ,fragala m.s. ,stout j.r. ,hoffman j.r.
منبع journal of sports science and medicine - 2014 - دوره : 13 - شماره : 4 - صفحه:904 -911
چکیده    Muscle architecture is a determinant for sprinting speed and jumping power,which may be related to anaerobic sports performance. in the present investigation,the relationships between peak (pvjp) and mean (mvjp) vertical jump power,30m maximal sprinting speed (30m),and muscle architecture were examined in 28 college-aged,recreationally-active men (n = 14; 24.3 ± 2.2y; 89.1 ± 9.3kg; 1.80 ± 0.07 m) and women (n = 14; 21.5 ± 1.7y; 65.2 ± 12.4kg; 1.63 ± 0.08 m). ultrasound measures of muscle thickness (mt),pennation angle (png),cross-sectional area (csa),and echo intensity (echo) were collected from the rectus femoris (rf) and vastus lateralis (vl) of both legs; fascicle length (fl) was estimated from mt and png. men pos-sessed lower echo,greater muscle size (mt & csa),were faster,and were more powerful (pvjp & mvjp) than women. stepwise regression indicated that muscle size and quality influenced speed and power in men. in women,vastus lateralis asymmetry negatively affected pvjp (mt: r = –0.73; fl: r = –0.60) and mvjp (mt: r = –0.76; fl: r = –0.64),while asym-metrical echo (vl) and fl (rf) positively influenced mvjp (r = 0.55) and 30m (r = 0.57),respectively. thigh muscle architecture appears to influence jumping power and sprinting speed,though the effect may vary by gender in recreationally-active adults. appropriate assessment of these ultrasound variables in men and women prior to training may provide a more specific exercise prescription. © journal of sports science and medicine.
کلیدواژه 30m sprint; Muscle symmetry; Sports testing; Ultrasonography; Vertical jump
آدرس institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States, institute of exercise physiology and wellness,university of central florida,orlando, United States
 
     
   
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