High-intensity cycle interval training improves cycling and running performance in triathletes

Area of Science:

• Sports Science
• Exercise Physiology

Background:

• Effective cycle training is crucial for triathletes.
• High-intensity interval training (HIT) is a common training method.

Purpose of the Study:

• To compare the effects of long versus short HIT cycling protocols on triathlon-specific performance.
• To determine the impact of different HIT durations on cycling and running outcomes.

Main Methods:

• Fourteen moderately-trained male triathletes participated.
• Two HIT protocols were compared: LONG (6-8 × 5 min efforts) and SHORT (9-11 × 10, 20, 40 s efforts).
• Training interventions lasted 3 weeks, followed by repeated performance testing.

Main Results:

• Both groups showed similar improvements in maximal oxygen uptake (VO2peak).
• Both HIT protocols moderately improved cycling power output.
• The LONG HIT group demonstrated a substantial decrease in 5 km running time post-intervention.

Conclusions:

• Both short and long HIT intervals are beneficial for improving cycling physiology and performance in triathletes.
• Longer intervals (5 min) appear more effective for enhancing subsequent running performance in triathletes.