Reduction of gait data variability using curve registration

Sadeghi, Heydar; Allard, Paul; Shafie, Khalil; Mathieu, Pierre; Sadeghi, Somayeh; François, Patrice; Ramsay, J. O.

doi:10.1016/s0966-6362(00)00085-0

Cited by 60 publications

(60 citation statements)

References 13 publications

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“…This technique expands or compresses the time axis in order to find temporal alignment at points of interest (27). Three points of interest were identified which defined two sub-phases of the jump.…”

Section: Ground Reaction Forces In Vertical Jumpmentioning

confidence: 99%

Kinetic and Kinematic Analysis for Assessing the Differences in Countermovement Jump Performance in Rugby Players

Floría

Gómez-Landero

Suárez-Arrones³

et al. 2016

Journal of Strength and Conditioning Research

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The aim of this study was to ascertain the differences in kinetic and kinematic profiles between better and poorer performers of the vertical jump within a homogeneous group of trained adults. Fifty rugby players were divided into low scoring (LOW) and high scoring (HIGH) groups based on their performance in the vertical jump. The force, velocity, displacement, and RFD-time curves were analyzed in order to determine the differences between groups. The analysis of the data showed differences in all the patterns of the ensemble mean curves of the HIGH and LOW groups. During the eccentric phase, the differences in the HIGH group with respect to the LOW group were: Lower crouch position, higher downward velocity, and higher force and rate of force development during the braking of the downward movement. During the concentric phase, the HIGH group achieved higher upward velocity, higher force at the end of phase, and a higher position at take-off. The higher jump performances appear to be related to a more effective stretch-shortening cycle function which is characterized by a deeper and faster counter-movement with higher eccentric forces being applied to decelerate the downward movement leading to enhanced force generation during the concentric phase.Abstract Word Count: 198

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Section: Ground Reaction Forces In Vertical Jumpmentioning

confidence: 99%

Kinetic and Kinematic Analysis for Assessing the Differences in Countermovement Jump Performance in Rugby Players

Floría

Gómez-Landero

Suárez-Arrones³

et al. 2016

Journal of Strength and Conditioning Research

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“…Subtle variations in timing (possibly caused by altered speeds) can lead to inflated amplitude variability estimates (Chau et al, 2005). This can be somewhat addressed using curve registration techniques (Sadeghi et al, 2000), however such techniques are not yet widely used. Variability measured using MD without curve registration cannot currently differentiate between temporal and amplitude variability.…”

Section: Discussionmentioning

confidence: 99%

Kinematic Variability in Running: A Caution Regarding Use of the Spanning Set Measure

Hanlon

Kearney

Condell

2012

Journal of Applied Biomechanics

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The spanning set technique quantifies intertrial variability as the span between polynomial curves representing upper and lower standard deviation curves of a repeated movement. This study aimed to assess the validity of the spanning set technique in quantifying variability and specifically to determine its sensitivity to variability presented at different phases of a movement cycle. Knee angle data were recorded from a male participant completing 12 overground running trials. Variability was added to each running trial at five different phases of the running stride. Ten variability magnitudes were also used to assess the effect of variability magnitude on the spanning set measure. Variability was quantified in all trials using mean deviation and the spanning set measure. Results of a repeated-measures ANOVA showed significant differences between the spanning set score for trials using different phases of added variability. In contrast, mean deviation values showed no difference related to the phase of added variability. Therefore, the spanning set technique cannot be recommended as a valid measure of intertrial movement variability.

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“…Como o interesse é o de avaliar a variação da performance das atletas durante a temporada competitiva para cada mudança de objetivo no treinamento físico, normalizando os resultados dos testes em relação a coleta I, esta se torna referência para a verificação e avaliação frente aos sucessivos estímulos de sobrecarga de treinamento, devido à variabilidade intersujeito (26) , que possa ocorrer como resposta ao treinamento. Para verificar a diferença entre as médias foi utilizado o teste estatístico de Friedman com medidas repetidas para dados não-paramétricos.…”

Section: Análise Estatísticaunclassified

Estudo dos efeitos de temporada de treinamento físico sobre a Performance de uma equipe de handebol feminino sub-21

Dechechi

Machado

Ide

et al. 2010

Rev Bras Med Esporte

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RESUMOO handebol é um esporte que demanda resistência associada a ações rápidas e potentes, como saltos, bloqueios, sprints e arremessos. O objetivo deste estudo foi avaliar os efeitos de treinamento físico sistematizado de 38 semanas aplicado em uma equipe de handebol feminino sub-21 sobre a potência de membros superiores e inferiores, velocidade e resistência de sprints de 30m. A periodização consistiu de adaptação da teoria de cargas concentradas e objetivou dois picos de performance durante a temporada, com seis coletas de dados. Os valores de mediana e amplitude de variação dos dados (entre parênteses) para o teste de arremesso de medicine ball de 3kg foram: 2,98m (2,15-3,50), 2,84m (2,43-3,20), 2,90m (2,60-3,38), 3,10 (2,83-3,81), 2,84 (2,55-3,57) e 3,34 (2,93-3,83). Para o teste de salto triplo horizontal alternado: 5,60m (4,93-6,58), 5,37m (5,04-6,38), 5,36m (4,93-6,12), 5,65m (4,80-6,78), 5,63m (5,00-6,40) e 5,83m (5,14-6,05). Para o teste de velocidade de sprint de 30m: 5,8m/s (5,45-6,44), 6,64m/s (6,24-7,09), 5,65m/s (5,17-5,95) (não houve coleta IV para esta capacidade), 6,19m/s (5,57-6,26) e 5,83m/s (5,14-6,05). Para o número de sprints até queda de 10% velocidade de 30m: 4 (4-6), 5 (4-9), 4,5 (4-16) (não houve coleta IV para esta capacidade), 6 (4-12) e 5 (4-5). Observamos diferenças estatisticamente significativas nos testes de arremesso de medicine ball de 3kg e salto triplo horizontal em relação aos testes do início da temporada (p < 0,05) em pelo menos um dos períodos planejados para obtenção do pico de performance, sem melhoras significativas na velocidade média e resistência de sprints de 30m. O treinamento aplicado foi eficiente para a melhoria do condicionamento físico específico nos picos de performance, propiciando também melhor ajuste no treinamento para a próxima temporada.Palavras-chave: handebol, performance, treinamento físico. ABSTRACTHandball is a sport that demands endurance associated with fast and powerful actions such as jumps, blocks, sprints and throws. The aim of this study was to evaluate the effects of a 38-week systematic physical training applied to a women's under 21 handball team on upper and lower limb power, 30m sprints speed and endurance. The periodization applied was an adaptation of the Verkhoshansky theory, and aimed at two performance peaks during the season with six data collections. The median and range values for three kg medicine ball throwing was: 2.98m (2.15-3.50); 2.84m (2.43-3.20); 2.90m (2.60-3.38); 3.10 (2.83-3.81); 2.84 (2.55-3.57) and 3.34 (2.93-3.83). Regarding the three-pass running test: 5.60m (4.93-6.58); 5.37m (5.04-6.38); 5.36m (4.93-6.12); 5.65m (4.80-6.78); 5.63m (5.00-6.40) and 5.83m (5.14-6.05). Regarding the 30-m sprint test: 5.8m/s (5. 45-6.44); 6,64 m/s (6,24-7,09); 5.65m/s (5.17-5.95); (there was not IV moment for this test); 6.19 m/s (5.57-6.26) and 5.83 (5.14-6.05).Regarding the 30-m sprint endurance test until 10% decrease: 4 sprints (4-6); 5 sprints (4-9); 4,5 sprints (4-16); (there was not IV moment for this test); 6 sprints (4-1...

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Reduction of gait data variability using curve registration

Cited by 60 publications

References 13 publications

Kinetic and Kinematic Analysis for Assessing the Differences in Countermovement Jump Performance in Rugby Players

Kinetic and Kinematic Analysis for Assessing the Differences in Countermovement Jump Performance in Rugby Players

Kinematic Variability in Running: A Caution Regarding Use of the Spanning Set Measure

Estudo dos efeitos de temporada de treinamento físico sobre a Performance de uma equipe de handebol feminino sub-21

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