engleski

Effects of taekwondo style practice on cardiac remodeling and isokinetic thigh strength in elite women players

Objectives. - Leg muscle strength estimation and cardiac functional exploration helps to better understand some physical demands of practicing different styles of Taekwondo. The current study aimed to demonstrate the effect of the two existing Taekwondo practices on cardiac remodeling and leg isokinetic muscle strength in female players. Equipment and methods. - Twenty female taekwondo players divided into 2 groups [International Taekwondo (ITF) style (n = 10) and World Taekwondo (WT) style (n = 10)] were asked to achieve an echocardiographic exploration and concentric isokinetic evaluation of the knee at 60 degrees/s and 180 degrees/s with isokinetic dynamometer. Peak torqueses, peak torque relative to body mass, power and flexors/extensors ratios were studied. Results. - ITF group presented almost a higher muscular strength of the two extensors and flexors compared to WT group at the two velocities (P < 0.05). There were no significant differences between dominant and non-dominant side for WT female. At 60 degrees/s, ITF knee peak torque extensors (+18.8 Nm, ES = 0.5) and flexors (+ 32.73 Nm, ES = 0.95) were significantly higher than WT group (P < 0.05). Knee mean power flexors and extensors, peak torqueses flexors and ratio were greater also at 180 degrees/s (P < 0.05). Echocardiography test showed the interventricular septum thickness (+ 1.12 mm, ES = 1.05), the shortening fraction (+ 5.13%, ES = 0.99) and the "A" wave velocity in Doppler echocardiography (+ 0.12 cm/s, ES = 1.62) were higher in the IT group compared to the WT group (P < 0.05). Since this study showed that IT females are stronger in their legs, and induce a better adaptation of left ventricle, they may be exposed to a serious risk of muscle and knee joints injuries. (C) 2021 Elsevier Masson SAS. All rights reserved.

Leg force ; Echocardiography ; Heart ; Isokinetic ; Combat sport

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