%0 Journal Article %A G Neumayr %A R Pfister %A G Mitterbauer %A H Gaenzer %A W Sturm %A H Hoertnagl %T Heart rate response to ultraendurance cycling %D 2003 %R 10.1136/bjsm.37.1.89 %J British Journal of Sports Medicine %P 89-90 %V 37 %N 1 %X The heart rate (HR) response to ultraendurance cycling is poorly understood. This case report describes the exercise intensity of ultraendurance cycling by means of HR monitoring in a well trained male amateur cyclist performing the Ă–tztal Radmarathon twice en bloque in a circuit of two identical laps (distance 460 km; cumulative altitude difference 11 000 m). The overall intensity was moderate (HRmean = 130 beats/min; HRmean/HRmax = 0.71) corresponding to an average individual workload of 47% of Vo2max. Almost the whole race was performed under aerobic conditions (99.6%); high intensity work was negligible (0.4%). 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), HRmean by 10.1% (138 to 124 beats/min), and HRmean/HRmax by 10.7% (0.75 to 0.67). 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. %U https://bjsm.bmj.com/content/bjsports/37/1/89.full.pdf