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• W2617137740 abstract "Bilateral asymmetry has been observed in muscular strength/power movements and has been linked to poor performance and/or risk of injury. PURPOSE: to investigate bilateral asymmetry during jumping. METHODS: Athletes (A, intercollegiate sports; n=13) and active (C, n=11) men gave informed consent to participate in this approved study. Subjects completed repeat trials of 2-leg (2L) and single-leg (1L; left and right leg) squat jump without countermovement; data averaged across trials. Jumps were conducted on individual force plates (2L) or singularly for 1L. Jump height (JHt) was calculated from jump impulse (IMPJ) determined from ground reaction force and from flight time ([INCREMENT]t). Asymmetry index was calculated; (L-R)/(0.5*(L+R). Bilateral facilitation/deficit was determined from JHt; (1L+1R)/2L). Data were analysed by ANOVA and significant differences were accepted with p<0.05. RESULTS: 2L (A: 36.7±0.4 cm; C: 33.7±0.8 cm) and 1L (left & right: A: 17.5±0.4 & 16.7±0.3 cm; C: 15.9±0.4 & 16.8±0.6 cm, respectively) JHt was similar between groups. An extreme bilateral asymmetry (AI range 37 to -58%) was noted in IMPJ during 2L; individual leg IMPJ was not related to JHt (r=0.13 left; r=0.14 right). To accomplish similar 2L JHt both groups produced a greater jump impulse in one leg (A: 135.1±25.4 N; C: 108.3±24.1 N) vs the other (A: 111.6±19.7 N; C: 89.1±14.1 N); accounting for asymmetry. 2L performance was associated with a bilateral deficit (n=4) or facilitation (n=15); yet, neither bilateral asymmetry nor deficit/facilitation impacted performance directly. The top 5 jumps (>40 cm) were recorded from 2 A and 3 C with bilateral asymmetry (10-40%) and bilateral deficit (2-19%) or facilitation (5-12%). 1L jump performance was asymmetric (-35 to 28%). 1L JHt was also poorly related to IMPJ (r = 0.58 left and 0.50 right). CONCLUSION: Performance of 2-leg squat jump is associated with extreme IMPJ bilateral asymmetry (±45%) and is independent of training status. Expression of bilateral facilitation or deficit does not appear to impact jump effectiveness. 1L jump performance is limited in its ability to explain 2L jump performance, bilateral asymmetry, or neural strategy (bilateral deficit/facilitation) likely due to balance issues indicated by pattern (slope, appearance of plateaus, flat peak, etc.) of force expression." @default.
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• W2617137740 date "2017-05-01" @default.
• W2617137740 modified "2023-09-27" @default.
• W2617137740 title "Squat Jump Performance Is Not Related to Bilateral Asymmetry or Training State in College-aged Men" @default.
• W2617137740 doi "https://doi.org/10.1249/01.mss.0000517919.99715.2a" @default.
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