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Effects of fatigue on muscle stiffness and intermittent sprinting during cycling

Ditroilo, Massimiliano; Watsford, Mark; Fernández-Peña, Eneko; D'Amen, Giancarlo; Lucertini, Franceso; De Vito, Giuseppe

Authors

Massimiliano Ditroilo

Mark Watsford

Eneko Fernández-Peña

Giancarlo D'Amen

Franceso Lucertini

Giuseppe De Vito



Abstract

Purpose: It was recently demonstrated that musculoarticular (MA) stiffness is related to sprint cycling performance in nonfatigued conditions. This study examined whether relatively stiffer cyclists were more effective at sprinting under fatigued conditions, as occurs during endurance cycling competitions. Methods: MA stiffness of the quadriceps was assessed in 21 trained male cyclists (28.7 ± 9.5 yr, 1.74 ± 0.08 m, 67.5 ± 7.2 kg). Participants also performed a maximal 6-s sprint on a cycle ergometer to assess peak power output (PO peak ), peak crank torque (CT peak ), and peak rate of crank torque development (RCTD peak ). A cycling fatigue protocol then required cyclists to pedal at 30%, 35%, and 40% of PO peak and sprint at the end of each stage. Surface EMG was recorded from vastus lateralis during each sprint and analyzed in the time domain as integrated EMG (iEMG) and in the frequency domain as instantaneous median frequency (MDF) adopting a continuous wavelet transform. Participants were then retested for MA stiffness. Results: MA stiffness (-12%) was significantly reduced after the cycling protocol. Further, PO peak , CT peak , RCTD peak , and iEMG were reduced by 20%, 15%, 13%, and 20%, respectively, after the fatigue protocol (P < 0.05). When the cyclists were divided into relatively stiff (SG) and relatively compliant groups (CG), only SG exhibited significant decreases in MA stiffness, C T peak , RCTD peak (P < 0.05), and instantaneous MDF (R = 0.705). Conclusions: Whereas neuromechanical parameters were generally reduced under conditions of fatigue, stiff and compliant cyclists were affected differently, with the sprint abilities of SG decreased to the level of CG. It seems important for endurance cyclists to incorporate training strategies to maintain MA stiffness during competition to offset declines in sprint performance. © 2011 by the American College of Sports Medicine.

Citation

Ditroilo, M., Watsford, M., Fernández-Peña, E., D'Amen, G., Lucertini, F., & De Vito, G. (2011). Effects of fatigue on muscle stiffness and intermittent sprinting during cycling. Medicine and Science in Sports and Exercise, 43(5), 837-845. https://doi.org/10.1249/MSS.0b013e3182012261

Journal Article Type Article
Acceptance Date Jan 1, 2011
Publication Date May 1, 2011
Deposit Date Nov 13, 2014
Publicly Available Date Apr 27, 2018
Journal Medicine And Science In Sports And Exercise
Print ISSN 0195-9131
Electronic ISSN 1530-0315
Publisher Lippincott, Williams & Wilkins
Peer Reviewed Peer Reviewed
Volume 43
Issue 5
Pages 837-845
DOI https://doi.org/10.1249/MSS.0b013e3182012261
Keywords Physical Therapy, Sports Therapy and Rehabilitation; Orthopedics and Sports Medicine
Public URL https://hull-repository.worktribe.com/output/466493
Publisher URL https://insights.ovid.com/crossref?an=00005768-201105000-00014

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