Online citations, reference lists, and bibliographies.

Evidence For Neuromuscular Fatigue During High-intensity Cycling In Warm, Humid Conditions

D. Kay, F. Marino, J. Cannon, A. St. Clair Gibson, Mike I. Lambert, Timothy D. Noakes
Published 2001 · Medicine

Cite This
Download PDF
Analyze on Scholarcy
Share
Abstract The purpose of this study was to examine and describe the neuromuscular changes associated with fatigue using a self-paced cycling protocol of 60-min duration, under warm, humid conditions. Eleven subjects [mean (SE) age 21.8 (0.8) years; height 174.9 (3.0) cm; body mass 74.8 (2.7) kg; maximum oxygen consumption 50.3 (1.8) ml · kg · min−1] performed one 60-min self-paced cycling time trial punctuated with six 1-min “all out” sprints at 10-min intervals, while 4 subjects repeated the trial for the purpose of determining reproducibility. Power output, integrated electromyographic signal (IEMG), and mean percentile frequency shifts (MPFS) were recorded at the mid-point of each sprint. There were no differences between trials for EMG variables, distance cycled, mean heart rate, and subjective rating of perceived exertion for the subjects who repeated the trial (n=4). The results from the repeated trials suggest that neuromuscular responses to self-paced cycling are reproducible between trials. The mean heart rate for the 11 subjects was 163.6 (0.71) beats · min−1. Values for power output and IEMG expressed as a percentage of that recorded for the initial sprint decreased during sprints 2–5, with normalised values being 94%, 91%, 87% and 87%, respectively, and 71%, 71%, 73%, and 77%, respectively. However, during the final sprint normalised power output and IEMG increased to 94% and 90% of initial values, respectively. MPFS displayed an increase with time; however, this was not significant (P=0.06). The main finding of this investigation is the ability of subjects to return power output to near initial values during the final of six maximal effort sprints that were included as part of a self-paced cycling protocol. This appears to be due to a combination of changes in neuromuscular recruitment, central or peripheral control systems, or the EMG signal itself. Further investigations in which changes in multiple physiological systems are assessed systematically are required so that the underlying mechanisms related to the development of fatigue during normal dynamic movements such as cycling can be more clearly delineated.



This paper is referenced by
10.1007/s00421-008-0738-2
Neuromuscular fatigue is greater following highly variable versus constant intensity endurance cycling
J. Theurel (2008)
10.1136/bjsm.2009.054973
Neuromuscular responses to hydration in moderate to warm ambient conditions during self-paced high-intensity exercise
F. Marino (2009)
10.1111/j.1600-0838.2011.01313.x
Effects of different pedalling techniques on muscle fatigue and mechanical efficiency during prolonged cycling.
Jean Theurel (2012)
Perceived exertion relationships in adults and children
Danielle Marie Lambrick (2010)
The Effect of Hyperthermia on Cerebral Hemodynamics, Biological Fatigue and Cardiovascular Strain During 40km Time- Trial Cycling in Trained Triathletes
Simon Schaerz (2013)
10.3917/SM.052.0083
Étiologie et cinétique d'apparition de la fatigue neuromusculaire lors d'exercices prolongés de cyclisme
R. Lepers (2004)
10.1007/978-3-319-29728-6_1
Physiological Aspects of Marathon Running
Billy Sperlich (2016)
10.1007/978-3-319-93515-7_4
Neural and Muscular Function in the Heat
Sébastien Racinais (2019)
10.1186/2193-1801-2-317
Hot ambient conditions shift the Force / EMG relationship
Sébastien Racinais (2013)
Short-term heat acclimation training: effects on performance and inflammation
Joshua H Guy (2016)
10.1079/ECP200437
Physiological function and neuromuscular recruitment in elite South African distance runners
T. Noakes (2004)
Analysis of road sprint cycling performance
P. Menaspà (2015)
10.1016/j.jtherbio.2016.02.006
The effect of high versus low intensity heat acclimation on performance and neuromuscular responses.
Georgia Wingfield (2016)
temperature rather than local muscle temperature Voluntary muscle activation is impaired by core
Melissa M. Thomas (2013)
10.23889/Suthesis.43713
Pre-competition and recovery strategies in elite sport : the use of vascular occlusion and ischemic preconditioning
Natalie Williams (2018)
10.1136/bjsm.2003.009852
Evidence for complex system integration and dynamic neural regulation of skeletal muscle recruitment during exercise in humans
A. St. Clair Gibson (2004)
10.1159/000151548
Thermoregulation, fatigue and exercise modality.
R. Tucker (2008)
10.1007/s00421-008-0817-4
Does a central governor regulate maximal exercise during combined arm and leg exercise? A rebuttal
T. Noakes (2008)
10.1016/j.psychsport.2020.101681
An investigation of expertise in cycling: Eye tracking, Think Aloud and the influence of a competitor
Hollie S. Massey (2020)
10.1007/s00421-007-0536-2
Overall and peripheral ratings of perceived exertion during a graded exercise test to volitional exhaustion in individuals of high and low fitness
J. Faulkner (2007)
10.1016/J.JTHERBIO.2011.10.009
Adding a cooling vest during cycling improves performance in warm and humid conditions
M. Luomala (2012)
Effect of Variability on Optimal Performance in Athletes.
L. Martin (2013)
10.1007/s00421-012-2316-x
The effect of skin temperature on performance during a 7.5-km cycling time trial
Koen Levels (2012)
10.1123/IJSPP.7.4.332
Changes of whole-body power, muscle function, and jump performance with prolonged cycling to exhaustion.
Jordan P R McIntyre (2012)
The Effects of Passive Heat Stress on Muscle Fatigue and Intracortical Excitability of the Wrist Flexors
Robert W. Bender (2011)
10.2165/11315130-000000000-00000
Is it Time to Retire the ‘Central Governor’?
R. Shephard (2009)
10.1249/MSS.0b013e318161729b
Validity of the CALER and OMNI-bike ratings of perceived exertion.
J. Barkley (2008)
Effects Of Concentric And Eccentric Contractions Of The Knee Extensors On Mechanical Work, Lactate Concentration, And Surface EMG
J. Campbell (2007)
Neuromuscular responses to hydration and exercise heat stress
F. Marino (2010)
10.1007/s00421-007-0508-6
Prediction of maximal oxygen uptake from the ratings of perceived exertion and heart rate during a perceptually-regulated sub-maximal exercise test in active and sedentary participants
J. Faulkner (2007)
10.1152/JAPPLPHYSIOL.00482.2009
Commentaries on Viewpoint: Current evidence does not support an anticipatory regulation of exercise intensity mediated by rate of body heat storage
Frank E. Marino (2009)
10.3920/CEP11012
The limitations of the constant load and self-paced exercise models of exercise physiology
Francesco Marino (2010)
See more
Semantic Scholar Logo Some data provided by SemanticScholar