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DOI: 10.1055/s-0028-1104582
© Georg Thieme Verlag KG Stuttgart · New York
Influence of Starting Strategy on Cycling Time Trial Performance in the Heat
Publication History
accepted after revision July 23, 2008
Publication Date:
06 February 2009 (online)
Abstract
The purpose of this study was to determine the influence of starting strategy on time trial performance in the heat. Eleven endurance trained male cyclists (30±5 years, 79.5±4.6 kg, V˙O2max 58.5±5.0 ml.kg.−1 min−1) performed four 20-km time trials in the heat (32.7±0.7°C and 55% relative humidity). The first time trial was completed at a self-selected pace (SPTT). During the following time trials, subjects performed the initial 2.5-km at power outputs 10% above (10% ATT), 10% below (10% BTT) or equal (ETT) to that of the average power during the initial 2.5-km of the self-selected trial; the remaining 17.5-km was self-paced. Throughout each time trial, power output, rectal temperature, skin temperature, heat storage, pain intensity and thermal sensation were taken. Despite significantly (P<0.05) greater power outputs for 10% BTT (273±45W) compared with the ETT (267±48W) and 10% ATT (265±41W) during the final 17.5-km, overall 20-km performance time was not significantly different amongst trials. There were no differences in any of the other measured variables between trials. These data show that varying starting power by ±10% did not affect 20 km time trial performance in the heat.
Key words
pacing strategy - power - thermoregulation - bicycling - hyperthermia
References
- 1 Abbiss CR, Laursen PB. Describing and understanding pacing strategies during athletic competition. Sports Med. 2008; 38 239-252
- 2 Abbiss CR, Laursen PB. Models to explain fatigue during prolonged endurance cycling. Sports Med. 2005; 35 865-898
- 3 Abbiss CR, Levin G, MacGuigan MR, Laursen PB. Reliability of power output during dynamic cycling. Int J Sports Med. 2008; 29 574-578
- 4 Abbiss CR, Peiffer JJ, Peake JM, Nosaka K, Suzuki K, Martin DT, Laursen PB. Effect of carbohydrate ingestion and ambient temperature on muscle fatigue development in endurance-trained male cyclists. J Appl Physiol. 2008; 104 1021-1028
- 5 Abbiss CR, Quod MJ, Levin G, Martin DT, Laursen PB. Accuracy of the Velotron cycle ergometer and SRM power meter. Int J Sports Med. 2009; 30 107-112
- 6 Aisbett B, Le Rossignol P, Sparrow WA. The influence of pacing during 6-minute supra-maximal cycle ergometer performance. J Sci Med Sport. 2003; 6 187-198
- 7 Atkinson G, Brunskill A. Pacing strategies during a cycling time trial with simulated headwinds and tailwinds. Ergonomics. 2000; 43 1449-1460
- 8 Atkinson G, Davison R, Jeukendrup A, Passfield L. Science and cycling: current knowledge and future directions for research. J Sports Sci. 2003; 21 767-787
- 9 Bassett Jr DR, Kyle CR, Passfield L, Broker JP, Burke ER. Comparing cycling world hour records, 1967–1996: modeling with empirical data. Med Sci Sports Exerc. 1999; 31 1665-1676
- 10 Bishop D, Bonetti D, Dawson B. The influence of pacing strategy on VO2 and supramaximal kayak performance. Med Sci Sports Exerc. 2002; 34 1041-1047
- 11 Borg GA. Psychophysical bases of perceived exertion. Med Sci Sports Exerc. 1982; 14 377-381
- 12 Ciubotariu A, Arendt-Nielsen L, Graven-Nielsen T. The influence of muscle pain and fatigue on the activity of synergistic muscles of the leg. Eur J Appl Physiol. 2004; 91 604-614
- 13 Cochrane DJ, Sleivert GG. Do changing patterns of heat and humidity influence thermoregulation and endurance performance?. J Sci Med Sport. 1999; 2 322-332
- 14 Koning JJ de, Bobbert MF, Foster C. Determination of optimal pacing strategy in track cycling with an energy flow model. J Sci Med Sport. 1999; 2 266-277
- 15 Prampero PE di. Cycling on Earth, in space, on the Moon. Eur J Appl Physiol. 2000; 82 345-360
- 16 Foster C, Hoyos J, Earnest C, Lucia A. Regulation of energy expenditure during prolonged athletic competition. Med Sci Sports Exerc. 2005; 37 670-675
- 17 Foster C, Schrager M, Snyder AC, Thompson NN. Pacing strategy and athletic performance. Sports Med. 1994; 17 77-85
- 18 Foster C, Snyder AC, Thompson NN, Green MA, Foley M, Schrager M. Effect of pacing strategy on cycle time trial performance. Med Sci Sports Exerc. 1993; 25 383-388
- 19 Hawley JA, Noakes TD. Peak power output predicts maximal oxygen uptake and performance time in trained cyclists. Eur J Appl Physiol. 1992; 65 79-83
- 20 Lepers R, Maffiuletti NA, Rochette L, Brugniaux J, Millet GY. Neuromuscular fatigue during a long-duration cycling exercise. J Appl Physiol. 2002; 92 1487-1493
- 21 Mattern CO, Kenefick RW, Kertzer R, Quinn TJ. Impact of starting strategy on cycling performance. Int J Sports Med. 2001; 22 350-355
- 22 MacDaniel J, Subudhi A, Martin JC. Torso stabilization reduces the metabolic cost of producing cycling power. Can J Appl Physiol. 2005; 30 433-441
- 23 Nielsen B, Hales JR, Strange S, Christensen NJ, Warberg J, Saltin B. Human circulatory and thermoregulatory adaptations with heat acclimation and exercise in a hot, dry environment. J Physiol. 1993; 460 467-485
- 24 Padilla S, Mujika I, Angulo F, Goiriena JJ. Scientific approach to the 1-h cycling world record: a case study. J Appl Physiol. 2000; 89 1522-1527
- 25 Rauch HGL, St Clair Gibson A, Lambert EV, Noakes TD. A signalling role for muscle glycogen in the regulation of pace during prolonged exercise. Br J Sports Med. 2005; 39 34-38
- 26 Saunders AG, Dugas JP, Tucker R, Lambert MI, Noakes TD. The effects of different air velocities on heat storage and body temperature in humans cycling in a hot, humid environment. Acta Physiol Scand. 2005; 183 241-255
- 27 Sporer BC, MacKenzie DC. Reproducibility of a laboratory based 20-km time trial evaluation in competitive cyclists using the Velotron Pro ergometer. Int J Sports Med. 2007; 28 940-944
- 28 St Clair Gibson A, Lambert MI, Noakes TD. Neural control of force output during maximal and submaximal exercise. Sports Med. 2001; 31 637-650
- 29 St Clair Gibson A, Schabort EJ, Noakes TD. Reduced neuromuscular activity and force generation during prolonged cycling. Am J Physiol. 2001; 281 R187-196
- 30 Tatterson AJ, Hahn AG, Martin DT, Febbraio MA. Effects of heat stress on physiological responses and exercise performance in elite cyclists. J Sci Med Sport. 2000; 3 186-193
- 31 Thompson KG, MacLaren DP, Lees A, Atkinson G. The effect of even, positive and negative pacing on metabolic, kinematic and temporal variables during breaststroke swimming. Eur J Appl Physiol. 2003; 88 438-443
- 32 Tucker R, Bester A, Lambert EV, Noakes TD, Vaughan CL, St Clair Gibson A. Non-random fluctuations in power output during self-paced exercise. Br J Sports Med. 2006; 40 912
- 33 Tucker R, Marle T, Lambert EV, Noakes TD. The rate of heat storage mediates the anticipatory reduction in exercise workrate during cycling in the heat at a fixed rating of perceived exertion. J Physiol. 2006; 574 905-915
- 34 Tucker R, Rauch L, Harley YXR, Noakes TD. Impaired exercise performance in the heat is associated with an anticipatory reduction in skeletal muscle recruitment. Pflugers Arch. 2004; 448 422-430
- 35 Young AJ, Sawka MN, Epstein Y, Decristofano B, Pandolf KB. Cooling different body surfaces during upper and lower body exercise. J Appl Physiol. 1987; 63 1218-1223
- 36 Zavorsky GS, Murias JM, Gow J, Kim DJ, Poulin-Harnois C, Kubow S, Lands LC. Laboratory 20-km cycle time trial reproducibility. Int J Sports Med. 2007; 28 743-748
Correspondence
C. R. AbbissBSc. Sports Science
School of Exercise
Biomedical and Health Sciences
Edith Cowan University
100 Joondalup drive
6168 Perth
Australia
Phone: +61/8/6304 51 56
Fax: +61/8/6304 50 36
Email: c.abbiss@ecu.edu.au