Factors affecting performance in an ultraendurance triathlon.

Area of Science:

• Sports Science
• Exercise Physiology
• Human Performance

Background:

• Physiological variables like VO2max and AT predict endurance performance.
• Ultraendurance events (>4 hours), such as the ultraendurance triathlon (UET), present unique performance prediction challenges.
• Current physiological markers may not fully explain performance limitations in ultraendurance settings.

Purpose of the Study:

• To investigate the physiological demands of ultraendurance triathlon (UET) performance.
• To identify factors limiting performance beyond established endurance markers.
• To propose a new intensity threshold for optimizing UET performance.

Main Methods:

• The study reviews existing literature on physiological correlates of endurance and ultraendurance performance.
• It analyzes the discrepancy between laboratory-assessed anaerobic threshold (AT) and hypothesized UET cycling intensity.
• It considers factors such as substrate utilization and fluid/electrolyte balance.

Main Results:

• Laboratory assessments indicate that time to exhaustion at anaerobic threshold (AT) is approximately 255 minutes.
• This duration is insufficient for the entire cycling phase of a UET.
• Factors beyond AT, including fueling and hydration, likely limit prolonged ultraendurance performance.

Conclusions:

• The anaerobic threshold (AT) may be too high an intensity to sustain during the cycling leg of an ultraendurance triathlon (UET).
• Finite gastric emptying and fluid/electrolyte imbalances are potential limiting factors in ultraendurance events.
• An 'ultraendurance threshold' is proposed as a more appropriate intensity guideline for UET performance.