![]() ![]() The available information about man's physiological heart rate (HR) response to long term cycling is restricted to data obtained from professional road cycling 1– 4 and from cycle touring events of the usual distance. ![]() This scale of HR decrease corresponds to comparable data gained in the field of triathlon and represents a specific cardiac feature of ultraendurance exercise in general. The average speed and the HR response also declined in the course of the two laps, average speed by 17.2% (23.8 to 19.7 km/h), HR mean by 10.1% (138 to 124 beats/min), and HR mean/HR max by 10.7% (0.75 to 0.67). Almost the whole race was performed under aerobic conditions (99.6%) high intensity work was negligible (0.4%). The overall intensity was moderate (HR mean = 130 beats/min HR mean/HR max = 0.71) corresponding to an average individual workload of 47% of V o 2 max. This case report describes the exercise intensity of ultraendurance cycling by means of HR monitoring in a well trained male amateur cyclist performing the Ötztal Radmarathon twice en bloque in a circuit of two identical laps (distance 460 km cumulative altitude difference 11 000 m). The heart rate (HR) response to ultraendurance cycling is poorly understood.
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