Correlation Of Force-Time Curve Characteristics,Lower Limb Musculature And Jump Height In High Level Male Volleyball Players

Purpose: The aim of this study is to analyse the force-time curve characteristics and lower limb musculature characteristics of volleyball-specific vertical jumps of highlevel male volleyball players.The relationship between the force-time curve characteristic indexes of the attacking and blocking jumps,as well as the muscular structure characteristic indexes of the lateral femoris,rectus femoris and lateral gastrocnemius muscles and the height of the attack and blocking jumps,as well as further analysis of how the muscular structure of the lower limbs affects the force-time curve characteristics of the volleyball-specific vertical jumps and ultimately changes the jump height,will be explored.In this way,the key factors for improving the height of attacking and blocking jumps will be explored,which will help coaches and athletes to evaluate volleyball-specific vertical jumping ability,design suitable training programmes and improve their game performance.Methods: This paper uses research methods such as documentary method,testing method and mathematical and statistical method.Fifteen high-level male volleyball players were selected as subjects for this study.The study was conducted in January2022,firstly,using a real-time B-mode ultrasound imager,and a 4.2-13.0 MHz linear probe,according to a standardised ultrasound testing protocol to image the subjects’ lateral femoral muscle,the subjects completed a attack jump test and a blocking jump test,and the 3D kinematic signals and ground reaction force signals were recorded simultaneously during the vertical jump using a 3D infrared motion capture system and a 3D force measurement table;finally,the kinematic signals were recorded using the Radi Ant DICOM Viewer 2021.1.1 software was used to process the measured musculoskeletal ultrasound images and calculate the relevant metrics,the Qualisys Track Manager 2019.2 motion capture system was used to identify the calibrated reflective Marker balls,and Visual 3D software was used to process the acquired The signals were processed and relevant metrics were calculated using Visual 3D software.A two-factor analysis was conducted to determine the effect of force-time curve characteristics on the height of the jump during the snap and block jumps,and the effect of lower limb musculature on the height of the jump during the snap and block jumps.In addition,the reliability of the lower limb musculature was analysed by using the intraclass correlation coefficient(ICC),Cronbach’s alpha(CA)and coefficient of variation(CV).Results:(1)There is a significant and highly positive correlation(r=0.52,P<0.05)between relative centrifugal peak force,relative force at take-off and height of blocking jump in high-level male volleyball players(r=0.53,P=0.04);a significant and highly positive correlation(r=0.98,P=0.001)between time of flight and height of blocking jump;a significant and highly positive correlation(r=0.81,P=0.001)between centripetal peak velocity,centripetal mean velocity,velocity at take-off and height of block jump were highly positively correlated(r=0.81,P=0.001)(r=0.64,P=0.01)(r=0.88,P=0.001);relative centrifugal impulse,relative total impulse and height of block jump were highly positively correlated(r=0.66,P= 0.01)(r=0.57,P=0.03);there were significant and highly positive correlations between relative centripetal peak power,relative centripetal mean power,relative power at take-off and height of block jump(r=0.75,P=0.001)(r=0.65,P=0.01)(r=0.60,P=0.02).(2)There were significant and highly positive correlations between relative centripetal peak force,relative centripetal mean force and snapping jump height during snapping jumps in high-level male volleyball players(r=0.54,P=0.04)(r=0.56,P=0.03);significant and highly positive correlations between flight time and centripetal time ratio,flight time and snapping jump height(r=0.56 P=0.03)(r=0.91,P=0.001);a significant and highly positive correlation between peak centripetal velocity,mean centripetal velocity,velocity at take-off and snap jump height(r=0.65,P=0.01)(r=0.68,P=0.01)(r=0.64,P=0.01);a significant and highly positive correlation between relative centripetal impulse and snap jump height(r=0.65,P=0.01)(r=0.68,P=0.01);and a significant(r=0.65,P=0.01);there was a significant and highly positive correlation between relative centripetal peak power and snapping jump height(r=0.80,P=0.001).(3)There was a significant and highly positive correlation(r=0.64,P=0.01)between the cross-sectional area of the lateral femoral muscles and the height of the block and attack jump in high-level male volleyball players(r=0.61,P=0.02).(4)There was a significant and highly positive correlation between time of flight and the cross-sectional area of the lateral femoral muscle during blocking jumps in high-level male volleyball players(r=0.61,P=0.02);there was a significant and highly positive correlation between peak centripetal velocity,mean centripetal velocity,velocity at take-off and the cross-sectional area of the lateral femoral muscle(r=0.54,P=0.04)(r=0.53,P=0.04)(r=0.56,P=0.03);there was a significant and highly positive correlation between relative centripetal peak power,relative centripetal mean power and the cross-sectional area of the lateral femoral muscle(r=0.65,P=0.01)(r=0.59,P=0.02).(5)There was a significant and highly positive correlation between time of flight and the cross-sectional area of the lateral femoral muscle during the snap jump in highlevel male volleyball players(r=0.68,P=0.01);there was a significant and highly positive correlation between peak centripetal velocity,mean centripetal velocity,velocity at take-off and the cross-sectional area of the lateral femoral muscle(r=0.57,P=0.03)(r=0.67,P=0.01)(r=0.57,P=0.03);there was a significant and highly positive correlation between relative centripetal peak power and the cross-sectional area of the lateral femoral muscle(r=0.66,P=0.01).Conclusions:(1)The force-time curve characteristic indicators of volleyball-specific vertical jump reflect the explosive force generation ability of high-level male volleyball players during jumping actions.The higher the key force,time,speed,impulse,and power indicators of the force-time curve characteristics,the higher the volleyball-specific vertical jump height.(2)The lower limb muscle structure of high-level male volleyball players affects their volleyball-specific vertical jump performance.The larger the cross-sectional area of the lateral thigh muscle,the higher the volleyball-specific vertical jump height.(3)The lower limb muscle structure of high-level male volleyball players also affects the key indicators of the force-time curve of volleyball-specific vertical jump.The larger the cross-sectional area of the lateral thigh muscle,the higher the key force,time,speed,impulse,and power indicators of the force-time curve of volleyballspecific vertical jump.