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Pacing Strategy Affects the Sub-Elite Marathoner's Cardiac Drift and Performance
Véronique Louise Billat1, Florent Palacin1, Matthieu Correa1
1IEA 3625/Institut des Sciences du Sport/I3SP, Université de Paris, Paris, France.
Frontiers in Psychology
|March 7, 2020
Summary
Recreational marathoners who slow down significantly during races experience greater cardiac drift. Cardiac cost, not just heart rate, is a better indicator of marathon performance and cardiac strain.
Area of Science:
- Sports Science
- Cardiovascular Physiology
- Exercise Performance
Background:
- Heart rate monitoring is common for marathon running but cardiovascular drift during prolonged exercise complicates intensity assessment.
- Cardiac cost (CC), calculated as heart rate divided by running velocity, is a potential metric to evaluate cardiovascular drift.
- Understanding the interplay between running strategy, cardiac drift, and performance is crucial for recreational marathoners.
Purpose of the Study:
- To investigate the relationship between recreational marathoners' racing strategies, cardiac drift, and overall performance.
- To identify distinct running patterns and their association with physiological responses during a marathon.
- To determine the most effective metric for assessing cardiac strain and its impact on marathon outcomes.
Main Methods:
- Analyzed speed time series data from 280 recreational marathoners using Kendall's non-parametric rank correlation coefficient.
- Categorized runners into 'fallers' (significant speed decrease after 26 km) and 'non-fallers'.
- Compared performance and cardiac drift between the two groups, and correlated cardiac drift amplitude with marathon performance.
Main Results:
- The majority of runners (77%) were classified as 'fallers', exhibiting a significant speed decrease around the 26 km mark.
- 'Fallers' demonstrated significantly lower performance and higher cardiac drift compared to 'non-fallers'.
- Marathon performance correlated with the amplitude of cardiac drift (r=0.18, p=0.0018), but not with the increase in heart rate alone (r=0.01, p=0.80).
Conclusions:
- Running strategy significantly impacts cardiac drift in recreational marathoners.
- Cardiac cost is a more reliable indicator of marathon performance and cardiac strain than heart rate alone.
- Cardiac cost could be integrated into mobile applications to provide runners with better feedback on their strategy and physiological state.
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