Abstract
Professional road cycling is an extreme endurance sport. Approximately 30 000 to 35 000km are cycled each year in training and competition and some races, such as the Tour de France last 21 days (∼100 hours of competition) during which professional cyclists (PC) must cover >3500km. In some phases of such a demanding sport, on the other hand, exercise intensity is surprisingly high, since PC must complete prolonged periods of exercise (i.e. time trials, high mountain ascents) at high percentages (∼90%) of maximal oxygen uptake (V̇O2max) [above the anaerobic threshold (AT)]. Although numerous studies have analysed the physiological responses of elite, amateur level road cyclists during the last 2 decades, their findings might not be directly extrapolated to professional cycling. Several studies have recently shown that PC exhibit some remarkable physiological responses and adaptations such as: an efficient respiratory system (i.e. lack of ‘tachypnoeic shift’ at high exercise intensities); a considerable reliance on fat metabolism even at high power outputs; or several neuromuscular adaptations (i.e. a great resistance to fatigue of slow motor units). This article extensively reviews the different responses and adaptations (cardiopulmonary system, metabolism, neuromuscular factors or endocrine system) to this sport. A special emphasis is placed on the evaluation of performance both in the laboratory (i.e. the controversial Conconi test, distinction between climbing and time trial ability, etc.) and during actual competitions such as the Tour de France.
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References
Lucía A, Hoyos J, Carvajal A, et al. Heart rate response to professional road cycling: the Tour de France. Int J Sports Med 1999; 20: 167–72
Fernández-García B, Pérez-Landaluce J, Rodríguez-Alonso M, et al. Intensity of exercise during road race pro-cycling competition. Med Sci Sports Exerc 2000; 32: 1002–6
Padilla A, Mujika I, Cuesta G, et al. Level ground and uphill cycling ability in professional road cycling. Med Sci Sports Exerc 1999; 31: 878–85
Lucía A, Hoyos J, Chicharro JL. Preferred pedalling cadence in professional cycling. Med Sci Sports Exerc. In press
Lucía A, Hoyos J, Chicharro JL. Physiological response to professional road cycling: climbers vs. time trialists. Int J Sports Med 2000; 21: 505–12
Padilla S, Mujika I, Orbañanos J, et al. Exercise intensity during competition time trials in professional road cycling. Med Sci Sports Exerc 2000; 32: 850–6
Bassett DR, Chester JR, Passfield L, et al. Comparing cycling world hour records, 1967–1996: modeling with empirical data. Med Sci Sports Exerc 1999; 31: 1665–76
McCole SD, Claney K, Conte J-C, et al. Energy expenditure during bicycling. J Appl Physiol 1990; 68: 748–53
Mena P, Maynar M, Campillo JE. Changes in plasma enzyme activities in professional racing cyclists. Br J Sports Med 1996; 30: 122–4
Padilla S, Mujika I, Angulo F, et al. Scientific approach to the 1-h cycling record: a case study. J Appl Physiol 2000; 89: 1522–7
Swain DP. The influence of body mass in endurance bicycling. Med Sci Sports Exerc 1994; 26: 58–63
Wolski LA, McKenzie DC, Wenger HA. Altitude training for improvements in sea level performance: is there scientific evidence of benefit? Sports Med 1996; 22: 251–63
Anholm JD, Milne EN, Stark P, et al. Radiographic evidence of interstitial pulmonary edema after exercise at altitude. J Appl Physiol 1999; 86: 503–9
Hoogeveen AR. The effect of endurance training on the ventilatory response to exercise in elite cyclists. Eur J Appl Physiol 2000; 82: 45–51
Hoogeveen AR, Zonderland ML. Relationship between testosterone, cortisol and performance in professional cyclists. Int J Sports Med 1996; 17: 423–8
Lucía A, Chicharro JL, Pérez M, et al. Reproductive function in male endurance athletes: sperm analysis and hormonal profile. J Appl Physiol 1996; 81: 2627–36
Lucía A, Pardo J, Durántez A, et al. Physiological differences between professional and elite road cyclists. Int J Sports Med 1998; 19: 342–8
Chicharro JL, Carvajal A, Pardo J, et al. Physiological parameters determined at OBLA vs a fixed heart rate of 175 beatsmin-1 in an incremental test performed by amateur and professional cyclists. Jpn J Physiol 1999; 49: 63–9
Chicharro JL, Hoyos J, Lucía A. Effects of endurance training on the isocapnic buffering and hypocapnic hyperventilation phases in professional cyclists. Br J Sports Med 2000; 34: 450–5
Lucía A, Carvajal A, Boraita A, et al. Heart dimensions might influence the occurrence of the heart rate deflection point in highly trained cyclists. Br J Sports Med 1999; 33: 387–92
Lucía A, Hoyos J, Pérez M, et al. Heart rate and performance parameters in elite cyclists: a longitudinal study. Med Sci Sports Exerc 2000; 32: 1777–82
Lucía A, Hoyos J, Chicharro JL. The slow component of O2 in professional cyclists. Br J Sports Med 2000; 34: 367–74
Saris WHM, van Erp-Baart MA, Brouns F, et al. Study on food intake and energy expenditure during extreme sustained exercise: the Tour de France. Int J Sports Med 1989; 10 Suppl.: S26-S31
Lucía A, Carvajal A, Alfonso A, et al. Breathing pattern in highly competitive cyclists during incremental exercise. Eur J Appl Physiol 1999; 79: 512–21
Lacour JR, Padilla S, Denis C. L’inflexion de la courbe fréquence cardiaque: puissance n’est pas un témoin du seuil anaérobie. Sci Motr 1987; 1: 3–6
Wasserman K, Beaver WL, Whipp BJ. Gas exchange theory and the lactic acidosis (anaerobic) threshold. Circulation 1990; 81 Suppl. 2: 14–30
Xu F, Rhodes EC. Oxygen uptake kinetics during exercise. Sports Med 1999; 27: 313–27
Hagberg JM, Mullin JP, Nagle FJ. Oxygen consumption during constant-load exercise. J Appl Physiol 1978; 45: 381–4
Lucía A, Hoyos J, Pérez M, et al. Thyroid hormones may influence the slow component of O2 in professional cyclists. Jpn J Physiol. In press
Conconi F, Grazzi G, Casoni C, et al. The Conconi test: methodology after 12 years of application. Int J Sports Med 1996; 17: 509–19
Skinner JS, McLellan TH. The transition from aerobic to anaerobic metabolism. Res Q Exerc Sport 1980; 51: 234–8
Jeukendrup A, Van diemen A. Heart rate monitoring during training and competition in cyclists. J Sports Sci 1998; 16 Suppl.: S91-S99
Wilmore JH, Stanforth PR, Gagnon J, et al. Endurance exercise training has a minimal effect on resting heart rate: The HERITAGE Study. Med Sci Sports Exerc 1996; 28: 829–35
Nishimura T, Yamada Y, Kawai CH. Echocardiographic evaluations of long-term effects of exercise on left ventricular hypertrophy and functions in professional bicyclists. Circulation 1980; 61: 832–40
Cohen A, Diebold B, Raffoul H, et al. Evaluation par echocardiographie Doppler des functions systolique et diastolique du ventricule gauche du coeur d’atlète. Arch Mal Coeur 1989; 82: 55–62
Missault L, Duprez D, Jordaens L, et al. Cardiac anatomy and diastolic filling in professional road cyclists. Eur J Appl Physiol 1993; 66: 405–8
Urhausen A, Kinderman W. Cardiac anatomy and diastolic filling in professional road cyclists [letter]. Eur J Appl Physiol 1993; 67: 567–8
Rodríguez Reguero JJ, Iglesias Cubero G, López de la Iglesia J, et al. Prevalence and upper limit of cardiac hypertrophy in professional cyclists. Eur J Appl Physiol 1995; 70: 375–8
Iglesias Cubero G, Rodriguez Reguero JJ, Terrados N, et al. Aldosterone levels and cardiac hypertrophy in professional cyclists. Eur J Appl Physiol 1995; 16: 475–7
Abergel E, Linhart A, Chatellier G, et al. Vascular and cardiac remodeling in world class professional cyclists. Am Heart J 1998; 136: 818–23
Fagard RH. Athlete’s heart: a meta-analysis of the echocardiographic experience. Int J Sports Med 1996; 17 Suppl.: S140-S144
Huonker M, König D, Keul J. Assessment of left ventricular dimensions and functions in athletes and sedentary subjects at rest and during exercise using echocardiography, doppler sonography and radionuclide ventriculography. Int J Sports Med 1996; 17 Suppl.: S173-S179
Pelliccia A, Maron BJ, Spataro A, et al. The upper limit of physiologic hypertrophy in highly trained elite athletes. N Engl J Med 1991; 324: 295–301
Kaimal KP, Franklin BA, Moir TW, et al. Cardiac profiles of national-class race walkers. Chest 1993; 104: 935–8
Bonetti A, Tirelli F, Albertini R, et al. Serum cardiac troponin T after repeated endurance exercise events. Int J Sports Med 1996; 17: 259–62
Chevalier JM, Enon B, Walder J, et al. Endofibrosis of the external iliac artery in bicycle racers: an unrecognized pathological state. Ann Vasc Surg 1986; 1: 297–303
Rousselet MC, Saint-André JP, L’Hoste PH, et al. Stenotic intimal thickening of the external iliac artery in competition cyclists. Hum Pathol 1990; 21: 524–9
Abraham P, Chevalier JM, Leftheriotis G, et al. Lower extremity disease in sports. Am J Sports Med 1997; 25: 581–4
Abraham P, Saumet JL, Chevalier JM. External iliac artery endofibrosis in athletes. Sports Med 1997; 24: 221–6
Chevalier JM. Pathologie vasculaire du cycliste. Encyclopedie Medico-Chirurgicale. 1997; A10: 11–675
Schep G, Bender MHM, Kaandorp D, et al. Flow limitations in the iliac arteries in endurance athletes. Current knowledge and directions for the future. Int J Sports Med 1999; 20: 421–8
Faria IE, Faria EW, Roberts S, et al. Comparison of physical and physiological characteristics in elite young and mature cyclists. Res Q Exerc Sport 1989; 60: 388–95
Folinsbee LJ, Wallace ES, Bedi JF, et al. Exercise respiratory pattern in elite cyclists and sedentary subjects. Med Sci Sports Exerc 1983; 15: 503–9
Clark JM, Hagerman FC, Gelfand R. Breathing patterns during submaximal and maximal exercise in elite oarsmen. J Appl Physiol 1983; 55: 440–6
Gallagher CG, Brown E, Younes M. Breathing pattern during maximal exercise and during submaximal exercise with hypercapnia. J Appl Physiol 1987; 63: 238–44
Lucía A, Pardo J, Hoyos J, et al. Metabolic and neuromuscular adaptations to endurance training in professional cyclists: a longitudinal study. Jpn J Physiol 2000; 50: 381–8
Lucía A, Pardo J, Hoyos J, et al. Effects of endurance training in the breathing pattern of professional cyclists. Jpn J Physiol. In press
Fagard R, Aubert A, Lysens R, et al. A noninvasive assessment of seasonal variations in cardiac structure and function in cyclists. Circulation 1983; 67: 896–901
White JA, Quinn G, Al-Dawalibi M, et al. Seasonal changes in cyclists’ performance: part 1. The British road race squad. Br J Sports Med 1982; 16: 4–12
Sjodin B, Jacobs I, Svedenhag J. Changes in onset of blood lactate accumulation (OBLA) and muscles enzymes after training at OBLA. Eur J Appl Physiol 1982; 49: 45–57
Costill DL, Flynn MG, Kirman JP, et al. Effects of repeated days of intensified training on muscle glycogen and swimming performance. Med Sci Sports Exerc 1988; 20: 249–54
Weston AR, Myburgh KH, Lindsay FH, et al. Skeletal muscle buffering capacity and endurance performance after high-intensity interval training by well trained cyclists. Eur J Appl Physiol 1997; 75: 7–13
Arce JC, De Souza MJ. Exercise and male factor infertility. Sports Med 1993; 15: 146–68
Wheeler GD, Sing M, Pierce WD, et al. Endurance training decreases serum testosterone levels in men without change in luteinizing hormone pulsatile release. J Clin Endocrinol Metab 1991; 72: 422–5
De Souza MJ, Arce JC, Pescatello LS, et al. Gonadal hormones and semen quality in male runners. A volume threshold effect of endurance training. Int J Sports Med 1994; 15: 383–91
Ekblom B, Berglund B. Effect of erythropoietin administration on maximal aerobic power. Scand J Med Sci Sports 1991; 1: 88–93
Audran M, Gareau R, Matecki S, et al. Effects of erythropoietin administration in training athletes and possible indirect detection in doping control. Med Sci Sports Exerc 1999; 31: 639–45
Parisotto R, Gore CJ, Emslie KR, et al. A novel method utilizing markers of altered erythropoiesis for the detection of recombinant human erythropoietin abuse in athletes. Haematologica 2000; 85: 564–72
Eichner ER. Better dead than second. J Lab Clin Med 1992; 120: 359–60
Lasne F, de Ceaurriz J. Recombinant erythropoietin in urine. Nature 2000; 405: 635
Harrison MH. Effects of thermal stress and exercise on blood volume in humans. Physiol Rev 1985; 65: 149–209
Schmidt W, Biermann B, Winchenbach P, et al. How valid is determination of hematocrit values to detect blood manipulations? Int J Sports Med 2000; 21: 133–8
Marx JJ, Vergouwen PCJ. Packed-cell volume in elite athletes. Lancet 1998; 352: 451
Martin DT, Ashenden M, Pansotto R, et al. Blood testing for professional cyclists: what’s a fair haematocrit limit? [online]. Sportscience News 1997 Mar-Apr
O’Toole ML, Douglas PS, Douglas W, et al. Hematocrits of triathletes: is monitoring useful? Med Sci Sports Exerc 1999; 31: 372–7
Saris WHM, Senden JMG, Brouns F. What is a normal red-blood cell mass for professional cyclists? Lancet 1998; 352: 1758
Shaskey DJ, Green GA. Sports Haematology. Sports Med 2000; 29: 27–38
García-Rovés PM, Terrados N, Fernández S, et al. Comparison of dietary intake and eating behavior of professional road cyclists during training and competition. Int J Sports Med. In press
García-Rovés PM, Terrados N, Fernández S, et al. Macronutrients intake of top level cyclists during continuous competition: change in the feeding pattern. Int J Sports Med 1998; 19: 62–7
Brouns F, Saris WHM, Stroecken J, et al. Eating, drinking, and cycling. A controlled Tour de France simulation study, part I. Int J Sports Med 1989; 10 Suppl. 1: S32–40
Brouns F, Saris WHM, Stroecken J, et al. Eating, drinking, and cycling. A controlled Tour de France simulation study, part II. Effect of diet manipulation. Int J Sports Med 1989; 10 Suppl. 1: S41–8
Rauch LHG, Rodger Y, Wilson GR, et al. The effects of carbohydrate loading on muscle glycogen content and cycling performance. Int J Sports Nutr 1995; 5: 25–36
Coyle EF, Coggan AR, Hemmert MK, et al. Muscle glycogen utilization during prolonged strenuous exercise when fed carbohydrate. J Appl Physiol 1986; 61: 165–72
Lemon PWR. Do athletes need more dietary proteins and amino acids? Int J Sports Nutr 1995; 5 Suppl.: S39-S61
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Lucía, A., Hoyos, J. & Chicharro, J.L. Physiology of Professional Road Cycling. Sports Med 31, 325–337 (2001). https://doi.org/10.2165/00007256-200131050-00004
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DOI: https://doi.org/10.2165/00007256-200131050-00004