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Physiological responses to repeated bouts of highintensity ultraendurance cycling—a field study case report

Journal of Science and Medicine in Sport, ISSN: 1440-2440, Vol: 6, Issue: 2, Page: 176-186
2003
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Article Description

The present study aimed to 1) examine the relationship between laboratory-based measures and high-intensity ultraendurance (HIU) performance during an intermittent 24-h relay ultraendurance mountain bike race (∼20 min cycling, ∼60min recovery), and 2) examine physiological and performance based changes throughout the HIU event. Prior to the HIU event, four highly-trained male cyclists (age=24.0±2.1 yr; mass= 75.0±2.7 kg; V̇O 2peak = 70±3 ml·kg −1 ·min −1 ) performed 1) a progressive exercise test to determine peak volume of oxygen uptake (V̇O 2peak ), peak power output (PPO), and ventilatory threshold (T vent ), 2) time-to-fatigue tests at 100% (TF 100 ) and 150% of PPO (TF 150 ), and 3) a laboratory simulated 40-km time trial (TT 40 ). Blood lactate (Lac - ), haematocrit and haemoglobin were measured at 6-h intervals throughout the HIU event, while heart rate (HR) was recorded continuously. Intermittent HIU performance, performance HR, recovery HR, and Lac − declined ( P <0.05), while plasma volume expanded ( P <0.05) during the HIU event. TF 100 was related to the decline in lap time ( r =−0.96; P <0.05), and a trend ( P =0.081) was found between TF 150 and average intermittent HIU speed ( r = 0.92). However, other measures (V̇O 2peak, PPO, T vent, and TT 40 ) were not related to HIU performance. Measures of high-intensity endurance performance (TF 100, TF 150 ) were better predictors of intermittent HIU performance than traditional laboratory-based measures of aerobic capacity.

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