Document Detail

Effect of sprung (suspended) floor on lower extremity stiffness during a force-returning ballet jump.
MedLine Citation:
PMID:  22211195     Owner:  NLM     Status:  Publisher    
Our objective in this study was to compare stiffness of bilateral lower extremities (LEs) in ballet dancers performing sauté on a low-stiffness "sprung floor" to that during the same movement on a high-stiffness floor (wood on concrete). LE stiffness was calculated as the ratio of vertical ground reaction force (in kN) to compression of the lower limb (in meters). Seven female dancers were measured for five repetitions each at the point of maximum leg compression while performing sauté on both of the surfaces, such that 43 ms of data were represented for each trial. The stiffness of bilateral LEs at the point of maximum compression was higher by a mean difference score of 2.48 ± 2.20 kN/m on the low-stiffness floor compared to a high-stiffness floor. Paired t-test analysis of the difference scores yielded a one-tailed probability of 0.012. This effect was seen in six out of seven participants (one participant showed no difference between floor conditions). The finding of increased stiffness of the LEs in the sprung floor condition suggests that some of the force of landing the jump was absorbed by the surface, and therefore did not need to be absorbed by the participants' LEs themselves. This in turn implies that a sprung dance floor may help to prevent dance-related injuries.
James Hackney; Sara Brummel; Dana Becker; Aubrey Selbo; Sandra Koons; Meredith Stewart
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Publication Detail:
Journal Detail:
Title:  Medical problems of performing artists     Volume:  26     ISSN:  0885-1158     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2012-1-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9416269     Medline TA:  Med Probl Perform Art     Country:  -    
Other Details:
Languages:  ENG     Pagination:  195-199     Citation Subset:  -    
Department of Physical Therapy, Missouri State University, 901 South National Avenue, Springfield, MO 65897, USA. Tel 417-836-6239, fax 417-836-6229.
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