Physiological demands of cyclists during an ultra-endurance relay race: A field study report

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Bescos, Raul, Rodriguez, Ferran-Agustin, Iglesias, Xavier, Knechtle, Beat, Benitez, Adolfo, Marina, Michel, Madulles, Josep-Maria, Vazquez, Jairo and Torrado, Priscila (2011) Physiological demands of cyclists during an ultra-endurance relay race: A field study report. Chinese Journal of Physiology , 54 (5). pp. 339-346. ISSN 0304-4920


This study was to describe and compare the physiological demands of ultra-endurance cyclists during a 24 h cycling relay race. Eleven male athletes (means ± SD: 34.8 ± 5.6 years; 71.6 ± 4.9 kg; 174.6 ± 7.3 cm; BMI 23.5 ± 0.5 kg/m2; VO2max: 66.0 ± 6.4 ml/kg/min) participated in the study; eight in teams with a format of four riders (4C) and three in teams with six riders (6C). To investigate exercise intensity, heart rate (HR) was recorded while cycling using portable telemetric monitors. Three different exercise intensities were defined according to the reference HR values obtained during a pre race laboratory incremental VO2max test: Zone I (< anaerobic threshold [AT]), Zone II (between AT and the respiratory compensation point [RCP]), Zone III (> RCP). Total volume and intensity were integrated as a single variable (training impulse: TRIMP). The score for TRIMP in each zone was computed by multiplying the accumulated duration in this zone by a multiplier for this particular zone of exercise intensity. The average intensity did not differ between cyclists in 4C (means ± SD; 4C: 87 ± 3 HRmax) and 6C (87 ± 1% of HRmax), despite the higher volume performed by 4C (means ± SD; 4C: 361 ± 65; 6C: 242 ± 25 per min; P = 0.012). These differences in total exercise volume significantly affected the values TRIMP accumulated (means ± SD; 4C: 801 ± 98, confidence interval [CI] 95%: 719 – 884; 6C: 513 ± 25, CI 95%: 451 – 575; P = 0.012). The ultra-endurance threshold of 4C and 6C athletes lies at about 87% of HRmax for both. Although the intensity profile was similar, the TRIMP values differed significantly as a consequence of the higher volume performed by the 4C cyclists

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Item type Article
DOI 10.4077/CJP.2011.AMM065
Official URL
Subjects Historical > FOR Classification > 1106 Human Movement and Sports Science
Historical > Faculty/School/Research Centre/Department > School of Sport and Exercise Science
Keywords cycling, heart rate, intensity, performance, endurance, volume, athlete, athletic, exercise intensity
Citations in Scopus 8 - View on Scopus
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