Measurement of Pelvic Motion Is a Prerequisite for Accurate Estimation of Hip Joint Work in Maximum Height Squat Jumping

Blache, Yoann; Bobbert, Maarten F.; Argaud, S.; Fontenay, Benoît Pairot de; Monteil, Karine

doi:10.1123/jab.29.4.428

Cited by 5 publications

(8 citation statements)

References 20 publications

(22 reference statements)

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“…Block starts involve not only the movements of the lower limbs, but also those of the trunk segments [8]. Previous studies [9,10] on vertical jumps, which are similar to block starts in that they involve large movements of trunk segments, confirmed that the angular displacement of the pelvis in the sagittal plane was smaller than that of the entire trunk (i.e., trunk extended). A simulation study [11] revealed that the sagittal rotations of the thorax and lumbar segment in a vertical jump were generated by the lumbopelvic extensors, not by the hip extensors, and that the jumping height in a squat jump performed without lumbopelvic extensors is approximately 15% lower than when performed with lumbopelvic extensors.…”

Section: Introductionmentioning

confidence: 85%

Three-dimensional kinetic function of the lumbo-pelvic-hip complex during block start

2020

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Previous studies on joint kinetics during track and field block starts have been limited to lower-limb sagittal kinetics; however, we hypothesised that lumbopelvic extensors, lateral flexors, and hip abductors also act as substantial energy generators. The present study aimed to examine the three-dimensional lumbo-pelvic-hip kinetics to better understand the generation of mechanical energy during a block start. 3D kinematic and force data during block starts of 10 m maximal sprinting in 12 male sprinters (personal best in a 100 m sprint, 10.78 ± 0.19 s [range, 10.43-11.01 s]) were captured using a motion capture system and force platform. The three-dimensional lumbo-pelvic-hip kinetics were calculated. The peak lumbosacral extension torque (3.64 ± 0.39 Nm/kg) was significantly larger than any other lower-limb and lumbosacral torques (<3.0 Nm/kg). It was suggested that large lumbopelvic extension torques are needed during the block start to anchor the pelvis by cancelling out both hip extension torques acting on the pelvis, leading to hip extensor-induced thigh sagittal rotations rather than pelvic posterior tilt. During the double-stance phase, the lumbosacral extensors generated mechanical energy (0.35 ± 0.16 J/kg, 14 ± 4% of the sum of lumbosacral and lower-limb net joint work). During the single-stance phase, the sum of the net mechanical work by lumbosacral lateral flexors and front hip abductors was 0.35 ± 0.14 J/kg, which comprised 9 ± 3% of the sum of the net joint work. The results lead to the speculation of the importance of strengthening not only the leg extensors, but also the lumbopelvic extensors, lateral flexors, and hip abductors for block starts. Further training studies to verify this speculation will improve training strategies for the track and field block start performance.

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Section: Introductionmentioning

confidence: 85%

Three-dimensional kinetic function of the lumbo-pelvic-hip complex during block start

2020

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“…The joint moments were normalized according to the subject's body mass. The joint work was calculated by integrating the net joint moment (trapezoid method) with respect to the joint angle (Blache & Monteil, 2013).…”

Section: Discussionmentioning

confidence: 99%

Asymmetries in joint work during multi‐joint movement after anterior cruciate ligament reconstruction: A pilot study

Fontenay

Argaud

Blache

et al. 2014

Scandinavian Med Sci Sports

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After anterior cruciate ligament reconstruction (ACL-R), many studies have reported a deficit of performance on the injured leg during multi-joint tasks. However, the total mechanical joint work (WTotal ), parameter best related to the vertical displacement of the body mass center during vertical jumping, has not yet been studied. The aim of this research was to compare asymmetries between ACL-R subjects and healthy matched subjects, through the analysis of the kinematics and kinetics during a single-leg squat jump. Asymmetries are defined by the Limb Symmetry Index (LSI). A greater LSI was observed for WTotal in the ACL-R group than in the healthy group. There was no difference in LSI for knee joint work between the two groups, while the LSI for hip and ankle joint work was significantly larger in the ACL-R group. This was explained by greater LSI for the hip and ankle joint range of motion in the ACL-R group than in the healthy group. After ACL-R, patients exhibited greater asymmetries than healthy subjects during single-leg squat jump. Physiotherapists should focus on quality execution of multi-joint movement, especially on hip and ankle joints range of motion in order to reduce asymmetries and to improve vertical jumping performance.

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“…The pelvis was defined as the segment between the greater trochanter and the L5-S1 joint. The method used to determine the position of the L5-S1 joint is described by Blache, Bobbert, Argaud, Pairot de Fontenay, and Monteil (2013). The positions of the five lumbar vertebrae were determined by using the method in which the movement of each lumbar vertebra is not controlled individually (White & Panjabi, 1978).…”

Section: Data Reductionmentioning

confidence: 99%

Influence of lumbar spine extension on vertical jump height during maximal squat jumping

Blache

Monteil

2013

Journal of Sports Sciences

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The purpose of this study was to determine the influence of lumbar spine extension and erector spinae muscle activation on vertical jump height during maximal squat jumping. Eight male athletes performed maximal squat jumps. Electromyograms of the erector spinae were recorded during these jumps. A simulation model of the musculoskeletal system was used to simulate maximal squat jumping with and without spine extension. The effect on vertical jump height of changing erector spinae strength was also tested through the simulated jumps. Concerning the participant jumps, the kinematics indicated a spine extension and erector spinae activation. Concerning the simulated jumps, vertical jump height was about 5.4 cm lower during squat jump without trunk extension compared to squat jump. These results were explained by greater total muscle work during squat jump, more especially by the erector spinae work (+119.5 J). The erector spinae may contribute to spine extension during maximal squat jumping. The simulated jumps confirmed this hypothesis showing that vertical jumping was decreased if this muscle was not taken into consideration in the model. Therefore it is concluded that the erector spinae should be considered as a trunk extensor, which enables to enhance total muscle work and consequently vertical jump height.

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Measurement of Pelvic Motion Is a Prerequisite for Accurate Estimation of Hip Joint Work in Maximum Height Squat Jumping

Cited by 5 publications

References 20 publications

Three-dimensional kinetic function of the lumbo-pelvic-hip complex during block start

Three-dimensional kinetic function of the lumbo-pelvic-hip complex during block start

Asymmetries in joint work during multi‐joint movement after anterior cruciate ligament reconstruction: A pilot study

Influence of lumbar spine extension on vertical jump height during maximal squat jumping

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