Episode 32 - Cardiac Drift: Why Your Heart Rate Rises When Your Pace Doesn’t
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Episode 32 - Cardiac Drift: Why Your Heart Rate Rises When Your Pace Doesn’t
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In this episode of The Trail Running Briefing, we explore cardiac drift: why heart rate can gradually rise during long runs even when pace or effort appears unchanged.
We explain the relationship between heart rate and stroke volume, why heat, dehydration and prolonged exercise increase cardiovascular strain, and how this matters specifically for ultrarunners.
We also look at aerobic decoupling and durability, and discuss how pacing, consistent aerobic training, progressively longer runs, sensible hydration and heat acclimation can help reduce excessive drift.
The key message is simple: the same pace does not always mean the same physiological cost.
Key references:
Coyle, E.F. & González-Alonso, J. (2001). Cardiovascular drift during prolonged exercise: New perspectives. Exercise and Sport Sciences Reviews, 29(2), 88–92.
Fritzsche, R.G., Switzer, T.W., Hodgkinson, B.J. & Coyle, E.F. (1999). Stroke volume decline during prolonged exercise is influenced by the increase in heart rate. Journal of Applied Physiology, 86(3), 799–805.
Montain, S.J. & Coyle, E.F. (1992). Influence of graded dehydration on hyperthermia and cardiovascular drift during exercise. Journal of Applied Physiology, 73(4), 1340–1350.
González-Alonso, J., Calbet, J.A.L. & Nielsen, B. (1998). Muscle blood flow is reduced with dehydration during prolonged exercise in humans. The Journal of Physiology, 513(3), 895–905.
Maunder, E., Seiler, S., Mildenhall, M.J., Kilding, A.E. & Plews, D.J. (2021). The Importance of 'Durability' in the Physiological Profiling of Endurance Athletes. Sports Medicine, 51(8), 1619–1628.
Smyth, B., Maunder, E., Meyler, S., Hunter, B. & Muniz-Pumares, D. (2022). Decoupling of Internal and External Workload During a Marathon: An Analysis of Durability in 82,303 Recreational Runners. Sports Medicine, 52, 2283–2295.
Tyler, C.J., Reeve, T., Hodges, G.J. & Cheung, S.S. (2016). The Effects of Heat Adaptation on Physiology, Perception and Exercise Performance in the Heat: A Meta-Analysis. Sports Medicine, 46(11), 1699–1724.