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Differences in plantarflexor function during a stretch-shortening cycle task due to limb preference
- Source :
- Laterality: Asymmetries of Body, Brain and Cognition. 20:128-140
- Publication Year :
- 2014
- Publisher :
- Informa UK Limited, 2014.
-
Abstract
- Most healthy humans move symmetrically at gross limb level but large kinetic and kinematic asymmetries have been observed at joint level during locomotion. The aim of this study was to assess muscle function asymmetries in healthy, active adults using an adapted force sledge apparatus which isolates the plantarflexors during a stretch-shortening cycle (SSC) task. Peak force, rate of force development and SSC function of preferred and non-preferred limbs were assessed in 21 healthy, active individuals using the adapted sledge and three-dimensional motion analysis. Between-limb differences and relationships were determined using paired t-tests/Wilcoxon Signed-rank test, Cohen's dz, absolute symmetry index and Pearson's r/Spearman's rho. Significant differences with moderate effect size (ES) were observed in peak force (ES: 0.66), rate of peak force development (ES: 0.78), rate of force development in the first 50 ms (ES: 0.76), flight time (ES: 0.64) and SSC function (0.68), with no difference in contact time or duration of eccentric loading. A small ES (0.56) was observed in rate of force development in the first 30 ms. The upper range of asymmetry observed (up to 44.6%) was larger than previously reported for healthy individuals, indicating compensations occur at proximal joints during locomotion to ensure symmetrical movement.
- Subjects :
- Adult
Male
Reflex, Stretch
medicine.medical_specialty
Wilcoxon signed-rank test
Movement
Kinematics
Functional Laterality
Stretch shortening cycle
Young Adult
Physical medicine and rehabilitation
Rate of force development
Arts and Humanities (miscellaneous)
medicine
Humans
Range of Motion, Articular
General Psychology
Extremities
General Medicine
Function (mathematics)
Flight time
Biomechanical Phenomena
Female
Psychology
Symmetry index
Muscle Contraction
Subjects
Details
- ISSN :
- 14640678 and 1357650X
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Laterality: Asymmetries of Body, Brain and Cognition
- Accession number :
- edsair.doi.dedup.....800630f54333f11760b60a677212f3b7