In the Yurchenko(YU)vault, the springboard phase(SB) influences the success and the quality of the vault. From the recent reviews there are no studies concerning the YUSB. The only information about it, are on temporal and velocities data. This study analyzes the linear and angular kinematics of the SB to provide a description of the total and the lower body. The first was studied by the center of mass(COM) velocities and the body’s angle. The second one was analyzed by the hip, knee and ankle angles. Methods 18 YU of the 2006 Women Italian Championship were filmed using 3 cameras(BASLER 610 100Hz).Each movie was digitized with SIMI Motion.The COM was calculated with the Dempster model. Results In SB the horizontal velocity had a decrease of 1,24m/s (mean value mv) between the impact(IMP) and the takeoff(TKO). The vertical velocity at the IMP had a negative value due to the downward direction of the movement (–0,78m/s mv), and at the TKO its was 3,77m/s. The gymnasts hit and leave the SB with a great body’s angle(61° and 96°),so this angle covered a space of 35°(mv) during the SB. The hip is extended of 118°(mv) at the IMP and hyperextend of 195°(mv) at the TKO. The knee had a amortizing and pushing angle of 10° and 30°(mv),respectively. The ankle was flex of 90° at the IMP and its amortizing and pushing angles were 30° and 65°. Conclusions In SB the gymnasts exploit the decrease of the COM horizontal velocity to increase the vertical velocity essential to set up the successive phase on the vault, properly.The body’s angle data show that at the IMP, the gymnasts lean back about 30° from the vertical axis as in handspring and Tsukahara vaults. About the lower body’s angles chain, the gymnasts used the hip joint only to generate the angular momentum and to produce the backward rotation. The knee and ankle joints was used to amortize the hit by the roundoff and then to push for the successive phase.
Yurchenko Vault's Springboard Phase
PENITENTE, GABRIELLA;MERNI, FRANCO;FANTOZZI, SILVIA;FRANCESCHETTI, FRANCESCO
2009
Abstract
In the Yurchenko(YU)vault, the springboard phase(SB) influences the success and the quality of the vault. From the recent reviews there are no studies concerning the YUSB. The only information about it, are on temporal and velocities data. This study analyzes the linear and angular kinematics of the SB to provide a description of the total and the lower body. The first was studied by the center of mass(COM) velocities and the body’s angle. The second one was analyzed by the hip, knee and ankle angles. Methods 18 YU of the 2006 Women Italian Championship were filmed using 3 cameras(BASLER 610 100Hz).Each movie was digitized with SIMI Motion.The COM was calculated with the Dempster model. Results In SB the horizontal velocity had a decrease of 1,24m/s (mean value mv) between the impact(IMP) and the takeoff(TKO). The vertical velocity at the IMP had a negative value due to the downward direction of the movement (–0,78m/s mv), and at the TKO its was 3,77m/s. The gymnasts hit and leave the SB with a great body’s angle(61° and 96°),so this angle covered a space of 35°(mv) during the SB. The hip is extended of 118°(mv) at the IMP and hyperextend of 195°(mv) at the TKO. The knee had a amortizing and pushing angle of 10° and 30°(mv),respectively. The ankle was flex of 90° at the IMP and its amortizing and pushing angles were 30° and 65°. Conclusions In SB the gymnasts exploit the decrease of the COM horizontal velocity to increase the vertical velocity essential to set up the successive phase on the vault, properly.The body’s angle data show that at the IMP, the gymnasts lean back about 30° from the vertical axis as in handspring and Tsukahara vaults. About the lower body’s angles chain, the gymnasts used the hip joint only to generate the angular momentum and to produce the backward rotation. The knee and ankle joints was used to amortize the hit by the roundoff and then to push for the successive phase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
