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Time course of mechanical and neuromuscular characteristics of cyclists and triathletes during a fatiguing exercise.
Int J Sports Med. 2007 Feb; 28(2):148-56.IJ

Abstract

This study examined the impact of sport specificity on the time course of fatigue during maximal voluntary eccentric, concentric and isometric torque production following a submaximal isokinetic fatiguing exercise. Seven cyclists and seven triathletes performed a fatiguing exercise consisting of nine sets of 31 isokinetic concentric knee extensions at 1.05 rad . s (-1). Fatigue was assessed pre-exercise, after three and six sets, and post-exercise. The maximal knee extension torque associated with electromyographic (EMG) activity was recorded during voluntary contractions and electrically induced contractions (single and paired twitches). The maximal voluntary eccentric torque production declined in cyclists (18 +/- 3.5 %, p < 0.05) and was not significantly affected in triathletes (5 +/- 2.5 %, p > 0.05). The decrease in cyclists was associated with an increase in the sum of the normalized EMG (nRMS) values of the three agonist muscles (p < 0.01). Although no significant difference was observed between groups, the two-way repeated-measure analysis of variance revealed a time effect on maximal concentric and isometric torque, twitch contractile and electrophysiological response (M (max)) properties. No modification in the activation and coactivation levels was observed. In conclusion, these results indicate that the time course of fatigue, especially during eccentric contractions, is mediated by sport-specific adaptations likely due to the mode of muscle contraction used in the activity.

Authors+Show Affiliations

Laboratoire Physiologie des Adaptations, Performance Motrice et Santé (EA 3837), Faculté des Sciences du Sport, Université de Nice Sophia-Antipolis, 261 route de Granoble, 06205 Nice Cedex 3, France. garrande@unice.frNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17024624

Citation

Garrandes, F, et al. "Time Course of Mechanical and Neuromuscular Characteristics of Cyclists and Triathletes During a Fatiguing Exercise." International Journal of Sports Medicine, vol. 28, no. 2, 2007, pp. 148-56.
Garrandes F, Colson SS, Pensini M, et al. Time course of mechanical and neuromuscular characteristics of cyclists and triathletes during a fatiguing exercise. Int J Sports Med. 2007;28(2):148-56.
Garrandes, F., Colson, S. S., Pensini, M., & Legros, P. (2007). Time course of mechanical and neuromuscular characteristics of cyclists and triathletes during a fatiguing exercise. International Journal of Sports Medicine, 28(2), 148-56.
Garrandes F, et al. Time Course of Mechanical and Neuromuscular Characteristics of Cyclists and Triathletes During a Fatiguing Exercise. Int J Sports Med. 2007;28(2):148-56. PubMed PMID: 17024624.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Time course of mechanical and neuromuscular characteristics of cyclists and triathletes during a fatiguing exercise. AU - Garrandes,F, AU - Colson,S S, AU - Pensini,M, AU - Legros,P, Y1 - 2006/10/06/ PY - 2006/10/7/pubmed PY - 2007/4/4/medline PY - 2006/10/7/entrez SP - 148 EP - 56 JF - International journal of sports medicine JO - Int J Sports Med VL - 28 IS - 2 N2 - This study examined the impact of sport specificity on the time course of fatigue during maximal voluntary eccentric, concentric and isometric torque production following a submaximal isokinetic fatiguing exercise. Seven cyclists and seven triathletes performed a fatiguing exercise consisting of nine sets of 31 isokinetic concentric knee extensions at 1.05 rad . s (-1). Fatigue was assessed pre-exercise, after three and six sets, and post-exercise. The maximal knee extension torque associated with electromyographic (EMG) activity was recorded during voluntary contractions and electrically induced contractions (single and paired twitches). The maximal voluntary eccentric torque production declined in cyclists (18 +/- 3.5 %, p < 0.05) and was not significantly affected in triathletes (5 +/- 2.5 %, p > 0.05). The decrease in cyclists was associated with an increase in the sum of the normalized EMG (nRMS) values of the three agonist muscles (p < 0.01). Although no significant difference was observed between groups, the two-way repeated-measure analysis of variance revealed a time effect on maximal concentric and isometric torque, twitch contractile and electrophysiological response (M (max)) properties. No modification in the activation and coactivation levels was observed. In conclusion, these results indicate that the time course of fatigue, especially during eccentric contractions, is mediated by sport-specific adaptations likely due to the mode of muscle contraction used in the activity. SN - 0172-4622 UR - https://www.unboundmedicine.com/medline/citation/17024624/Time_course_of_mechanical_and_neuromuscular_characteristics_of_cyclists_and_triathletes_during_a_fatiguing_exercise_ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-2006-924206 DB - PRIME DP - Unbound Medicine ER -