Front-crawl stroke descriptors variability assessment for skill characterisation

The goal of this article is to characterise front-crawl swimming skill based on variability pattern of technique descriptors. Nine national level and nine recreational swimmers performed three 300 m trials in a 50 m outdoor pool, at 70%, 80% and 90% of their front-crawl 400 m personal best time. Usi...

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Bibliographic Details
Published in:Journal of sports sciences 2016-08, Vol.34 (15), p.1405-1412
Main Authors: Dadashi, F., Millet, G.P., Aminian, K.
Format: Article
Language:English
Subjects:
Accelerometry - methods
Adaptation, Physiological
Adolescent
Arm - physiology
Biomechanical Phenomena
Biomechanics
coordination
Female
Humans
inertial sensor
Male
Motor ability
motor adaptation
Motor Skills - physiology
Physical Conditioning, Human
Swimming
Swimming - physiology
Time and Motion Studies
variability
Young Adult
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Summary:The goal of this article is to characterise front-crawl swimming skill based on variability pattern of technique descriptors. Nine national level and nine recreational swimmers performed three 300 m trials in a 50 m outdoor pool, at 70%, 80% and 90% of their front-crawl 400 m personal best time. Using wearable inertial measurement units (IMUs) and validated algorithms we assessed the variability of technique descriptors at each arm cycle (139 ± 17 per trial). We calculated the duration of pull, push and non-propulsive phases, index of coordination (IdC), stroke length, stroke rate and intra-cyclic velocity variation. To track intra-trial technique variability, we calculated the Cauchy index to quantify the stability of multidimensional technique descriptors in space-time. Skilled swimmers, having access to divers motor solutions, achieved significantly higher velocities at similar intensities and similar IdC (P 
ISSN:0264-0414
1466-447X
DOI:10.1080/02640414.2015.1114134