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Effects of a noncircular chainring system on muscle activation during cycling

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  • معلومة اضافية
    • Affiliation:
      a Universidade Federal do Rio Grande do Sul, Exercise Research Laboratory, Porto Alere, RS, Brazil
      b Universidade Federal do Pampa, Applied Neuromechanics Group, Uruguaiana, RS, Brazil
      c Universidade Federal de Santa Maria, Laboratory of Biomechanics, Santa Maria, RS, Brazil
      d University of Calgary, Human Performance Laboratory, Calgary, AB, Canada
    • Keywords:
      Noncircular chainring
      Muscle activity
      Lower limb
      Vastus lateralis
      Mountain-bike
      Equipment design
    • Abstract:
      Previous studies evaluated cycling with noncircular chainrings and suggested that changes in muscle activation would occur in response to altered pedaling mechanics throughout the crank arm revolution. However, no previous study addressed this question. The aim of this study was to compare the magnitude of muscular activity between a conventional and a noncircular crank system during an incremental maximal cycling test. Seven mountain-bike trained cyclists completed two incremental maximal tests, separated by 48 h, one for each crank system. Each test started with a workload of 100 W and was increased by 30 W every minute until exhaustion. Power output, pedaling cadence and heart rate were monitored and compared between the crank systems using paired t-tests. Surface EMG was recorded from the right rectus femoris, vastus medialis, biceps femoris and gastrocnemius medialis. EMG was compared using a general linear model considering as factors the crank system and workload with post hoc analysis at α = 0.05. RMS presented effect of workload, but no effect of crank system was found for the muscles analyzed. The present results do not support effects of the noncircular crank system on variables of performance and muscle activation during incremental cycling in trained mountain bike cyclists.
    • ISSN:
      1050-6411
    • Accession Number:
      10.1016/j.jelekin.2010.02.005
    • Accession Number:
      S1050641110000295
    • Copyright:
      Copyright @ 2010 Elsevier Ltd All rights reserved.
  • Citations
    • ABNT:
      DAGNESE, F. et al. Effects of a noncircular chainring system on muscle activation during cycling. Journal of Electromyography and Kinesiology, [s. l.], v. 21, n. 1, p. 13–17, 2011. DOI 10.1016/j.jelekin.2010.02.005. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=edselp&AN=S1050641110000295&custid=s8280428. Acesso em: 10 jul. 2020.
    • AMA:
      Dagnese F, Carpes FP, Martins E de A, Stefanyshyn D, Mota CB. Effects of a noncircular chainring system on muscle activation during cycling. Journal of Electromyography and Kinesiology. 2011;21(1):13-17. doi:10.1016/j.jelekin.2010.02.005.
    • AMA11:
      Dagnese F, Carpes FP, Martins E de A, Stefanyshyn D, Mota CB. Effects of a noncircular chainring system on muscle activation during cycling. Journal of Electromyography and Kinesiology. 2011;21(1):13-17. doi:10.1016/j.jelekin.2010.02.005
    • APA:
      Dagnese, F., Carpes, F. P., Martins, E. de A., Stefanyshyn, D., & Mota, C. B. (2011). Effects of a noncircular chainring system on muscle activation during cycling. Journal of Electromyography and Kinesiology, 21(1), 13–17. https://doi.org/10.1016/j.jelekin.2010.02.005
    • Chicago/Turabian: Author-Date:
      Dagnese, Frederico, Felipe P. Carpes, Elisandro de Assis Martins, Darren Stefanyshyn, and Carlos Bolli Mota. 2011. “Effects of a Noncircular Chainring System on Muscle Activation during Cycling.” Journal of Electromyography and Kinesiology 21 (1): 13–17. doi:10.1016/j.jelekin.2010.02.005.
    • Harvard:
      Dagnese, F. et al. (2011) ‘Effects of a noncircular chainring system on muscle activation during cycling’, Journal of Electromyography and Kinesiology, 21(1), pp. 13–17. doi: 10.1016/j.jelekin.2010.02.005.
    • Harvard: Australian:
      Dagnese, F, Carpes, FP, Martins, E de A, Stefanyshyn, D & Mota, CB 2011, ‘Effects of a noncircular chainring system on muscle activation during cycling’, Journal of Electromyography and Kinesiology, vol. 21, no. 1, pp. 13–17, viewed 10 July 2020, .
    • MLA:
      Dagnese, Frederico, et al. “Effects of a Noncircular Chainring System on Muscle Activation during Cycling.” Journal of Electromyography and Kinesiology, vol. 21, no. 1, Jan. 2011, pp. 13–17. EBSCOhost, doi:10.1016/j.jelekin.2010.02.005.
    • Chicago/Turabian: Humanities:
      Dagnese, Frederico, Felipe P. Carpes, Elisandro de Assis Martins, Darren Stefanyshyn, and Carlos Bolli Mota. “Effects of a Noncircular Chainring System on Muscle Activation during Cycling.” Journal of Electromyography and Kinesiology 21, no. 1 (January 1, 2011): 13–17. doi:10.1016/j.jelekin.2010.02.005.
    • Vancouver/ICMJE:
      Dagnese F, Carpes FP, Martins E de A, Stefanyshyn D, Mota CB. Effects of a noncircular chainring system on muscle activation during cycling. Journal of Electromyography and Kinesiology [Internet]. 2011 Jan 1 [cited 2020 Jul 10];21(1):13–7. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=edselp&AN=S1050641110000295&custid=s8280428