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Workload demands in mountain bike racing.
B Stapelfeldt1, A Schwirtz, Y O Schumacher
1Institute of Sports Science, University of Freiburg, Germany. bs@sport.uni-freiburg.de
International Journal of Sports Medicine
|May 27, 2004
Summary
Mountain bike races demand high and fluctuating power output, requiring cyclists to have well-developed aerobic and anaerobic systems. Heart rate remains consistently high during these demanding endurance events.
Area of Science:
- Sports Science
- Exercise Physiology
- Biomechanics
Background:
- Mountain biking involves intense, variable workloads.
- Understanding race demands is crucial for training optimization.
- Direct power measurement offers objective workload assessment.
Purpose of the Study:
- To quantify workload demands in mountain bike (MTB) races using direct power measurements.
- To compare in-race power data with laboratory-based exercise test results.
- To analyze the physiological intensity zones cyclists operate within during competition.
Main Methods:
- 11 national team cyclists (9 male, 2 female) participated.
- Power output (P) was recorded using mobile crank dynamometers during 15 races.
- Laboratory incremental exercise tests determined aerobic threshold (AT), anaerobic threshold (IAT), and maximal output (MAX).
- Race time was categorized into four intensity zones relative to AT, IAT, and MAX.
Main Results:
- Average power output was 246 W (male) and 193 W (female), with significant variations during races.
- Heart rate (HR) remained relatively stable (Male: 177 bpm, Female: 172 bpm) despite power fluctuations.
- Cyclists spent 39% of race time in Zone 1 (
Conclusions:
- MTB races are characterized by highly variable power output and consistently elevated heart rate.
- Sustaining the intense and fluctuating demands of MTB racing requires robust aerobic and anaerobic physiological capacities.
- Direct power measurement provides valuable insights into the specific physiological challenges of competitive mountain biking.