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Constant versus variable-intensity during cycling: effects on subsequent running performance.

Thierry Bernard¹, Fabrice Vercruyssen, Cyrille Mazure

¹Department of Sport Ergonomic and Performance, UFR STAPS, University of Sud Toulon-Var, BP 132, 83957, La Garde Cedex, France. thierry.bernard@univ-tln.fr

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Summary

Constant-intensity cycling improved subsequent running performance in triathletes compared to variable-intensity cycling. This suggests non-metabolic factors like neuromuscular changes influence performance after different cycling intensities.

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Area of Science:

Sports Science
Exercise Physiology
Endurance Sports

Background:

Understanding the impact of cycling intensity variations on subsequent running performance is crucial for triathletes.
Metabolic responses during and after exercise influence overall race outcomes.

Purpose of the Study:

To investigate the metabolic responses to variable-intensity (VI) versus constant-intensity (CI) cycling on 5-km running performance.
To compare running performance after freely chosen intensity (FCI), CI, and VI cycling protocols.

Main Methods:

Ten triathletes completed an incremental cycling test to determine maximal aerobic power (MAP).
Participants performed three cycle-run (C-R) sessions: FCI, CI, and VI cycling followed by a 5-km run.
Metabolic responses and running performance were measured during C-R sessions.

Main Results:

Running performance was significantly improved after CI cycling (1118 ± 72 s) compared to FCI (1134 ± 64 s) and VI (1168 ± 73 s) cycling.
No significant differences in metabolic variables were observed between the running sessions.
Cycling performance and metabolic responses during cycling were similar across all three conditions.

Conclusions:

Constant-intensity cycling enhances subsequent running performance more than variable-intensity cycling in triathletes.
The observed performance differences are likely due to non-metabolic factors, such as neuromuscular adaptations or muscle fatigue, rather than metabolic responses.
Optimizing cycling intensity distribution may be key for improving overall triathlon performance.