Document Detail

Individuality and reproducibility in high-speed motion of volleyball spike jumps by phase-matching and averaging.
MedLine Citation:
PMID:  16084205     Owner:  NLM     Status:  MEDLINE    
For analysis of knee injuries in volleyball, we developed a system to obtain kinematic waveforms about the high-speed motion of volleyball spike jumps that could examine their individuality and reproducibility, with phase-matching and averaging. The form of six female players was recorded in two sessions of ten jumps each, with a video motion-analysis system, VICON, at the sampling frequency of 240 Hz. To identify individual jump characteristics despite differences from jump to jump, we averaged up to ten data sets with phases matched. For such matching, we defined and used a statistic, epsilon, as the arithmetic mean of all absolute differences in each of the angles at each time sampled, based on the least squares method. Statistical evaluation with adjusted coefficients of multiple determination and epsilon showed that intra-individual variation between the two sessions was significantly smaller than inter-individual variation; their means differed by more than 2 standard deviations (SD) and 3SD, respectively. Regression analysis showed that this system was reliable (p < 0.001). We concluded that the averaged data sets obtained by the system could embody the individuality of spike jumps, with satisfactory reproducibility.
Mitsuru Tokuyama; Hirotsugu Ohashi; Hisao Iwamoto; Kunio Takaoka; Mamoru Okubo
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Publication Detail:
Type:  Journal Article; Validation Studies     Date:  2004-11-23
Journal Detail:
Title:  Journal of biomechanics     Volume:  38     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-08-08     Completed Date:  2005-11-29     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2050-7     Citation Subset:  IM    
Department of Orthopedic Surgery, Osaka City University Medical School, Japan.
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MeSH Terms
Athletic Injuries / physiopathology
Knee Injuries / physiopathology
Movement / physiology*
Musculoskeletal Physiological Phenomena
Physical Exertion*
Reproducibility of Results
Stress, Mechanical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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