Impact attenuation properties of jazz shoes alter lower limb joint stiffness

NewsBot · Oct 6, 2016

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Impact attenuation properties of jazz shoes alter lower limb joint stiffness during jump landings
Alycia Fong Yan, Richard M. Smith, Claire E. Hiller, Peter J. Sinclair
JMSS; Article in Press

Objectives
To quantify the impact attenuation properties of the jazz shoes, and to investigate the in-vivo effect of four jazz shoe designs on lower limb joint stiffness during a dance-specific jump.

Design
Repeated measures.

Methods
A custom-built mechanical shoe tester similar to that used by athletic shoe companies was used to vertically impact the forefoot and heel region of four different jazz shoe designs. Additionally, dancers performed eight sautés in second position in bare feet and the shoe conditions. Force platforms and 3D-motion capture were used to analyse the joint stiffness of the midfoot, ankle, knee and hip during the jump landings.

Results
Mechanical testing of the jazz shoes revealed significant differences in impact attenuation characteristics among each of the jazz shoe designs. Gross knee and midfoot joint stiffness were significantly affected by the jazz shoe designs in the dancers’ jump landings.

Conclusions
The tested jazz shoe designs altered the impact attenuating capacity of jump landing technique in dancers. The cushioned jazz shoes are recommended particularly for injured dancers to reduce impact on the lower limb. Jazz shoe design should consider the impact attenuation properties of the forefoot region, due to the toe-strike landing technique in dance movement.
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Admin2 · Oct 6, 2016

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NewsBot · Oct 23, 2018

Professional Dancers Distinct Biomechanical Pattern during Multidirectional Landings
Azevedo, Ana M
Medicine & Science in Sports & Exercise: October 22, 2018 - Volume Publish Ahead of Print - Issue - p

Purpose To compare lower extremity biomechanics between professional dancers (PDs) and non-dancers (NDs) during multidirectional single-leg landings.

Methods Fifteen PDs (27±7 years, 1.69±0.1m, 57.8±9.3kg), and 15 NDs (25±5 years, 1.69±0.1m, 66±10.2kg) performed single-leg jumps in three directions: 1) lateral, 2) diagonal, and 3) forward. Dominant LE biomechanical data were collected using a motion capture system. Data were processed in Visual3D. LE kinematic (hip, knee and ankle joint angles in sagittal and frontal planes, and range of motion (ROM)) and kinetics (hip and knee internal joint moments and vertical ground reaction force) variables were analyzed at initial contact (IC), peak vertical ground reaction force (PvGRF), and peak knee flexion (PKF). Repeated measures ANOVAs were conducted (p<0.05).

Results At IC, statistically significant interactions were found for ankle frontal and hip sagittal angles (p<0.05). Main effects for groups and jump directions were attained (p<0.05). PDs at IC had lower hip and knee flexion, and higher ankle plantarflexion than NDs. PDs had significantly higher knee (PDs: 41±6.1; NDs: 33.8±8.4) and ankle (PDs: 53.7±3.4; NDs: 38.9±8.9) ROM than NDs. At IC, the lateral jump had a higher hip abduction moment, hip abduction and ankle inversion, and lower hip flexion and ankle plantarflexion than the forward and diagonal jumps. The LJ (15.5±7.7) had higher hip excursion than the FJ (12.7±5.4).

Conclusion PDs higher extended posture at initial contact promoted an efficient use of the knee and ankle ROM to dissipate the landing forces. Regardless the group, jump directions also solicited different biomechanical responses, particularly between lateral and forward directions. These strategies should be considered for implementation in prevention programs, as it can foster adequate lower extremity neuromuscular control.
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