A study on estimating the center of gravity velocity using lower limb joint power during squatting

Saito, Ayuko; Miyawaki, Kazuto; Kizawa, Satoru

doi:10.1299/transjsme.17-00234

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Lower CG velocity at ground contact to ball contact phase in comparison to ball contact to maximum follow-through phase indicates that male soccer players might have done it to maintain dynamic stability as kicking leg's momentum is high in Instep Kick, which results in the fastest kick in Soccer. SAITO, Miyawaki & Kizawa concluded that lower extremity joint power at the time of squatting and walking has a quantitative association between the CG velocity [20,21]. No significant differences in the table 4 in CG velocity between ground contact to ball contact and ball contact to maximum follow-through phases in all the selected soccer kicks have been observed.…”

Section: Discussionmentioning

confidence: 99%

A Study of Center of Gravity in Different Phases of Selected Soccer Kicks

Chanda¹,

Mondal²

2019

AJLS

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The center of gravity (CG) of the human body is a hypothetical point around which the force of gravity appears to act. CG need not lie within the physical bounds of an object. Human beings do not remain fixed in the anatomical position and the precise location of the CG changes constantly with every new position of the body and limbs. CG plays an important role in maintaining balance, equilibrium, and breaking inertia during the performance of a sports technique. Purpose of this study is to discover the pattern and make the comparison of CG height and CG velocity changes in the execution of frequently used soccer kicks within and between the kicks by the male players. Five male players played for the Bangladesh National Football teams were selected as subject and their age was between 16-19 years. A Cannon EOS7D with the capacity of 55 f/sec camera placed on sagittal plane at the backside of the kick 5.00 meters away and at 1.13 meter of height to capture kicking actions of the players on Coronal/Frontal plane. The best frame was selected out of 3 trials. 2D motion Analysis Software Kinovea 0.8.25 was employed for the quantitative analysis of the video clips. Changing of the CG height position in percentage was studied in three different phases i.e. Ground contact, Ball contact, and Follow-through in reference to erect standing CG height of the players. In addition, CG velocity changes were also studied in ball contact and follow-through phases. This study demonstrates that the male soccer players demonstrate inconsistency in CG height reduction in performing all three phases (Ground Contact, Ball Contact, & Follow-through) in all selected five kicks (Push Pass, Instep Kick, Lofted Kick, Chip Shot, and In-swerve Kick), but highest reductions have been located in the ball contact phase of all the kicks. Players change CG height in the same manner among the five selected kicks in each of the phases distinctly. Players experience CG height drop in Instep Kick differently between ball contact and ground contact phases. Players display higher mean CG velocity in ball contact phase than follow-through phase in Push Pass but remaining other kicks exhibit opposite actions. Players display CG velocity in all selected soccer kicks in the same manner at ball contact and follow-through phases. Players change CG velocity differently between Push Pass and Instep Kick, In-swerve Kick, Lofted Kick at follow-through phase.

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Section: Discussionmentioning

confidence: 99%

A Study of Center of Gravity in Different Phases of Selected Soccer Kicks

Chanda¹,

Mondal²

2019

AJLS

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“…Therefore, demonstrating the relationship between lower limb muscle forces and exercise speed during squatting is important for clarifying the contribution of each muscle to exercise speed. In a previous study, we proposed a model that expresses the relationship between the joint power of the hip, knee, and ankle and the center of gravity velocity during squatting (Saito et al, 2017). Since a decrease in the velocity of the Ayuko SAITO*, Yoshikazu KOBAYASHI** and Satoru KIZAWA**…”

Section: Introductionmentioning

confidence: 99%

Analysis of center of gravity velocity using estimated lower limb muscle forces during squatting

Saito

KOBAYASHI

Kizawa

2023

JBSE

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This study proposes a squatting model that describes the relation between the center of gravity velocity and lower limb muscle forces that contribute to hip and knee flexion-extension and ankle dorsi-plantar flexion during squatting. Squatting exercises are experimentally monitored using a 3D motion analysis system and two force plates. Participants perform a squatting exercise with their feet shoulder-width apart without using a weight such as a barbell. Simulations using the musculoskeletal model calculate the lower limb muscle forces based on measured marker positions and floor reaction forces. The squatting model parameters are determined by a Kalman filter using the experimentally obtained center of gravity velocity, and lower limb muscle forces estimated by the simulations. The analysis results quantitatively demonstrate the contribution of each muscle to the center of gravity velocity during squatting. To verify the model accuracy, the root mean squared errors are calculated by using the center of gravity velocity that is obtained by the squatting model and the 3D motion analysis system. The root mean squared errors indicate that the contribution of each muscle to the center of gravity velocity may have differed between participants and between trials. The proposed method is expected to be utilized to evaluate the relation between the exercise velocity and muscle forces that is different among individual.

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Center of gravity velocity estimation using lower limb joint power during walking

Saito

Nara

Miyawaki

2019

Transactions of the JSME (In Japanese)

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This paper presents examination of a proposed method for center of gravity (COG) velocity estimation during walking using information obtained from lower limb motion measurements. Lower limb joints and muscles around these joints are used during walking. Gait velocity changes according to lower limb muscle activity. Some earlier reports of relevant studies have suggested that lower limb muscle weakness reduces the walking rate, which increases the probability of falling. Therefore, the relation between the COG velocity and lower limb motion during walking must be clarified. For this study, we constructed gait COG velocity models that represent the relation between the COG velocity and lower limb joint power for each gait phase. For this experiment, gait was measured using a 3D motion analysis system and floor reaction force gauges. We estimated the gait COG velocity models' parameters by applying Kalman filtering using measurement information. The results of analyses using gait COG velocity models indicate a quantitative relation between the COG velocity and the lower limb joint power during walking. Furthermore, results demonstrated that the lower limb joint power that influences the COG movement differs in each gait phase. This analytical method is anticipated for use in the evaluation of healthy feet and ill feet and for evaluating the balance of left and right feet.

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A study on estimating the center of gravity velocity using lower limb joint power during squatting

Cited by 3 publications

References 7 publications

A Study of Center of Gravity in Different Phases of Selected Soccer Kicks

A Study of Center of Gravity in Different Phases of Selected Soccer Kicks

Analysis of center of gravity velocity using estimated lower limb muscle forces during squatting

Center of gravity velocity estimation using lower limb joint power during walking

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