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Salivary Cortisol, Heart Rate and Blood Lactate Responses During Elite Downhill Mountain Bike Racing
Department of Sport Science, University of Wuppertal, Wuppertal, Germany. (Swedish Winter Sports Research Centre)
Institute of Training Science and Sport Informatics, German Sport University, Köln, Germany.
Institute of Health Promotion and Clinical Movement Science, Köln, Germany.
Institute of Training Science and Sport Informatics, German Sport University, Köln, Germany.
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2012 (English)In: International Journal of Sports Physiology and Performance, ISSN 1555-0265, E-ISSN 1555-0273, Vol. 7, no 1, p. 47-52Article, review/survey (Refereed) Published
Abstract [en]

Purpose: This study aimed to quantify the intensity profile of elite downhill mountain bike races during competitions. Methods: Seventeen maledownhill racers (22 ± 5 y; 185.1 ± 5.3 cm; 68.0 ± 3.9 kg; VO 2peak: 59.4 ± 4.1 mL min kg -1) participated in the International German DownhillChampionships in 2010. The racers' peak oxygen uptake and heart rate (HR) at 2 and 4 mmol L -1 blood lactate (HR2 and HR 4), were assessed during an incremental laboratory step test (100 W, increase 40 W every 5 min). During the races, the HR was recorded and pre- and postrace bloodlactate concentrations as well as salivary cortisol levels were obtained. Results: During the race, the absolute time spent in the "easy" intensity zone was 23.3 ± 6.8 s, 24.2 ± 12.8 s (HR 2-HR 4) in the "moderate" zone, and 151.6 ± 18.3 s (>HR 4) in the "hard" zone. Eighty percent of the entire race was accomplished at intensities >90% HRpeak. Blood lactate concentrations postrace were higher than those obtained after the qualification heat (8.0 ± 2.5 mmol L -1 vs 6.7 ± 1.8 mmol L -1, P < .01). Salivary levels of cortisol before the competition and the qualification heat were twice as high as at resting state (P < .01). Conclusions: This study shows that mountain bike downhill races are conducted at high heart rates and levels of blood lactate as well as increased concentration of salivary cortisol as marker for psycho-physiological stress. © 2011 Human Kinetics, Inc.

Place, publisher, year, edition, pages
2012. Vol. 7, no 1, p. 47-52
Keywords [en]
Blood lactate; Cycling; Heart rate; Off-road
National Category
Physiology Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-15579ISI: 000303279200009PubMedID: 22461462Scopus ID: 2-s2.0-84859471208OAI: oai:DiVA.org:miun-15579DiVA, id: diva2:468413
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Swedish Winter Sports Research CentreAvailable from: 2011-12-20 Created: 2011-12-20 Last updated: 2018-01-12Bibliographically approved

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Holmberg, Hans-Christer

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