+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Markerless analysis of front crawl swimming

, : Markerless analysis of front crawl swimming. Journal of Biomechanics 44(12): 2236-2242

Research on motion analysis of swimmers is commonly based on video recordings of the subject's motion, which are analyzed by manual digitization of feature points by an operator. This procedure has two main drawbacks: it is time-consuming, and it is affected by low repeatability. Therefore, the application of video-based, automatic approaches to motion analysis was investigated. A video-based, markerless system for the analysis of arm movements during front crawl swimming was developed. The method proposed by Corazza et al. (2010) was modified in order to be used into water environment. Three dimensional coordinates of shoulder, elbow and wrist joints centers of 5 sprint swimmers performing front crawl swimming were determined. Wrist joint velocity was also calculated. Accuracy and reliability of the proposed technique were evaluated by means of comparison with traditional manual digitization (SIMI Reality Motion Systems GmbH). Root mean square distance (RMSD) values between trajectories estimated with the two techniques were determined. Results show good accuracy for wrist joint (RMSD<56mm), and reliability, evaluated on one subject, comparable to the inter-operator variability associated with the manual digitization procedure. The proposed technique is therefore very promising for quantitative, wide-scale studies on swimmers' motion.


PMID: 21719017

DOI: 10.1016/j.jbiomech.2011.06.003

Other references

Anonymous, 1947: Trials with wheat varieties (in Denmark), 1943-46. The trials were carried out at seven of the State Experiment Stations. In 1943, owing to scarcity of seed, they were conducted at four Stations only. Five varieties were included in all the trials and the yield of the varieties which were tested i...

Jonas, R., 1967: Influence of antibiotic supplementation of the diet on various blood values in fattening calves kept under controlled environmental conditions. Four groups, each of nine 3-week-old calves, were fed, for 74 days, on a milk substitute supplemented with, per kg dry matter, 80 mg chlortetracycline, 40 mg "Panazon (test substance C1 48 401 Cynamid-Lederle)", or 80 mg chlortetracyclin...

Dudek T.; Swierczewska A.; Zuchiewicz W.; Ozimkowski W., 2000: Paleotemperatures in the Skole Nappe (Outer Carpathians) inferred from diagenetic evolution of illite/ smectite; the pilot result. Mineralia Slovaca: , Pages 303-304. 2000.

Anonymous, 1969: Regular discussion on acute and chronic pancreatitis. Lijecnicki Vjesnik 91(1): 55-82

Pip, E., 2000: Survey of bottled drinking water available in Manitoba, Canada. Forty domestic and imported brands of bottled water were purchased in Manitoba, Canada and examined for total dissolved solids (TDS), chloride, sulfate, nitrate-nitrogen, cadmium, lead, copper, and radioactivity. The samples showed great variation...

Bhattacharya Bimalendu B.; Shalivahan, 2002: The electric Moho underneath eastern Indian Craton. Geophysical Research Letters 29(10, 2002

Smedshaug, C.A.; Sonerud, G.A., 1997: Can predation on small game be limited by manipulation of offal?. Small game populations in general are supposed to have become smaller in many parts of Norway the past 40-50 years, except during the 1980s when an outbreak of sarcoptic mange on the red fox caused a temporary marked increase in the small game pop...

Shivran, H.-Singh; Kumar, S.; Kumar, D.; Singh, R.V., 2005: The effect of carbon as an energy source for biological denitrification through Pseudomonas stutzeri. The biological denitrification processes possess many advantages in comparison to other denitrification processes. The present study was undertaken to observe the effect of quantity of carbon on biological denitrification with Pseudomonas stutzeri...

Anonymous, 1972: How electricity comes, goes, and wanders. Rn 35(6): 41-2 Passim

Haug, T., 1969: Acute heart infarct with extremely high transaminase values. Tidsskrift for den Norske Laegeforening 89(23): 1799-801 Passim