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Comparison of young swimmer's active drag coefficient using three methods to compute trunk transverse surface area.

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  • معلومة اضافية
    • Alternate Title:
      Comparação do coeficiente de arrasto activo através de três técnicas de avaliação da área de secção tranversa do tronco em jovens nadadores.
    • Subject Terms:
    • Author-Supplied Keywords:
      anthropometrics
      antropometria
      arrasto
      drag
      hidrodinâmica
      hydroninamics
      Natação
      swimming
      antropometria
      arrasto
      hidrodinâmica
      Natação
      Language of Keywords: English; Portuguese
    • Abstract:
      The purpose of this study was to compare the active drag coefficient (CDa) of young swimmers using three different ways of measuring the trunk transverse surface area (TTSA). 23 young swimmers, including 12 boys and 11 girls were analyzed. The velocity perturbation method of Kolmogorov was used to compute CDa. The TTSA was calculated based on three methods: i) measured by photogrammetric; ii) estimated by the equation developed by Clarys and; iii) estimated from the equations developed by Morais et al. (2011). Three procedures were used in the comparison CDa values: i) t Student test; ii) simple linear regression analysis and; iii) Bland Altman plots. All paired samples showed significant differences (p < .001) when comparing mean values. However, there were significant correlations (p < .001) between the paired samples in the simple linear regression analysis, and the in the Bland Altman plots for all conditions studied. At least 80% of the plots were within the ± 1.96 standard deviation of the difference. As a conclusion, the mean values of CDa computed with TTSA estimated with the equations developed by Morais et al. (2011) were the ones with lower difference compared with TTSA measured directly. Those should be used by coaches and investigators in order to estimate TTSA for CDa computing. [ABSTRACT FROM AUTHOR]
    • Abstract:
      Foi objectivo deste estudo comparar o coeficiente de arrasto activo, calculado com recurso a três formas distintas de medição da área de secção transversa do tronco (ASTT). A amostra foi composta por 23 sujeitos, entre os quais 12 do sexo masculino e 11 do sexo feminino. Foi utilizado o método de perturbação de velocidade de Kolmogorov para calcular o arrasto activo e respectivo coeficiente de arrasto. O cálculo do coeficiente de arrasto foi efectuado de três formas distintas: i) com recurso à ASTT medida através de fotogrametria; ii) com recurso ASTT estimada a partir das equações de Morais et al. (2011); e iii) com recurso à ASTT estimada através da equação de Clarys. Foram utilizados três procedimentos no processo de comparação: i) comparação de valores médios; ii) análise de regressão linear simples; e iii) plot de Bland Altman. Todos os pares estudados apresentaram diferenças significativas (p < .001) na comparação de valores médios. No entanto, as análises de regressão lineares simples entre os pares estudados, registaram correlações significativas (p < .001), e o plot de Bland Altman, para todas as condições estudadas, registou mais de 80% dos plots dentro do intervalo de confiança de 95 %. Constatou-se que as equações de Morais et al. foram aquelas que apresentaram menor diferença (13.81 ± 9.24%), comparativamente com a de Clarys (26.87 ± 5.61%) em relação aos valores de ASTT medidos. Sugere-se assim a aplicação destas equações para a estimação da ASTT. [ABSTRACT FROM AUTHOR]
    • Abstract:
      Copyright of Motricidade is the property of Fundacao Tecnica e Cientifica do Desporto and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
    • Author Affiliations:
      1Polytechnic Institute of Bragança, Bragança
      2Research Centre in Sports, Health and Human Development (CIDESD), Vila Real, Portugal
      3University of Trás-os-Montes and Alto Douro, Vila Real
    • ISSN:
      1646-107X
    • Accession Number:
      75259745
  • Citations
    • ABNT:
      MORAIS, J. E. et al. Comparison of young swimmer’s active drag coefficient using three methods to compute trunk transverse surface area. Motricidade, [s. l.], v. 8, p. 19–25, 2012. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=75259745&custid=s8280428. Acesso em: 29 maio. 2020.
    • AMA:
      Morais JE, Costa MJ, Moreira MF, Barbosa TM. Comparison of young swimmer’s active drag coefficient using three methods to compute trunk transverse surface area. Motricidade. 2012;8:19-25. http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=75259745&custid=s8280428. Accessed May 29, 2020.
    • APA:
      Morais, J. E., Costa, M. J., Moreira, M. F., & Barbosa, T. M. (2012). Comparison of young swimmer’s active drag coefficient using three methods to compute trunk transverse surface area. Motricidade, 8, 19–25.
    • Chicago/Turabian: Author-Date:
      Morais, J. E., M. J. Costa, M. F. Moreira, and T. M. Barbosa. 2012. “Comparison of Young Swimmer’s Active Drag Coefficient Using Three Methods to Compute Trunk Transverse Surface Area.” Motricidade 8 (January): 19–25. http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=75259745&custid=s8280428.
    • Harvard:
      Morais, J. E. et al. (2012) ‘Comparison of young swimmer’s active drag coefficient using three methods to compute trunk transverse surface area’, Motricidade, 8, pp. 19–25. Available at: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=75259745&custid=s8280428 (Accessed: 29 May 2020).
    • Harvard: Australian:
      Morais, JE, Costa, MJ, Moreira, MF & Barbosa, TM 2012, ‘Comparison of young swimmer’s active drag coefficient using three methods to compute trunk transverse surface area’, Motricidade, vol. 8, pp. 19–25, viewed 29 May 2020, .
    • MLA:
      Morais, J. E., et al. “Comparison of Young Swimmer’s Active Drag Coefficient Using Three Methods to Compute Trunk Transverse Surface Area.” Motricidade, vol. 8, Jan. 2012, pp. 19–25. EBSCOhost, search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=75259745&custid=s8280428.
    • Chicago/Turabian: Humanities:
      Morais, J. E., M. J. Costa, M. F. Moreira, and T. M. Barbosa. “Comparison of Young Swimmer’s Active Drag Coefficient Using Three Methods to Compute Trunk Transverse Surface Area.” Motricidade 8 (January 2, 2012): 19–25. http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=75259745&custid=s8280428.
    • Vancouver/ICMJE:
      Morais JE, Costa MJ, Moreira MF, Barbosa TM. Comparison of young swimmer’s active drag coefficient using three methods to compute trunk transverse surface area. Motricidade [Internet]. 2012 Jan 2 [cited 2020 May 29];8:19–25. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=75259745&custid=s8280428