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You’re riding at your usual pace, your power is stable… but your heart rate monitor shows 10, 15, sometimes 20 beats per minute more than usual. Panic sets in: « Have I lost my fitness? Is my sensor broken? Am I done for? ». Rest assured: 95% of the time, it’s NOT a collapse of your physical condition. It’s simply your body sending you a clear signal. Here are the 5 most common reasons for an increased heart rate, even in experienced riders.
By Guillaume Judas – Photos: depositphotos.com
Reason No. 1: insufficient endurance base or a temporary loss of form
This is the most classic reason: if you have reduced your base endurance volume in recent weeks (off-season, injury, vacation, professional overload), your aerobic system is less efficient. You burn carbohydrates faster, accumulate more lactic acid, and your heart rate rises higher to compensate.
The solution: 3 to 6 weeks of sessions mostly in Zone 2 (an intensity where you can talk without difficulty). Your heart rate at the same power will gradually decrease.
Reason No. 2: consumption of stimulants (even legal ones) and certain medications
Caffeine (even 3-4 hours before), black tea, energy drinks, decongestants (pseudoephedrine), certain anti-allergics, or beta-blockers stopped abruptly… all increase heart rate at rest AND during exercise.
The solution: note everything you take in the 24 to 48 hours before a ride that gives strange numbers and test without it. You’ll be surprised by the impact of a simple double espresso before heading out for a ride.
Reason No. 3: body overheating
Your heart has two main jobs during exercise: to send blood to the muscles and cool the body by sweating and dilating cutaneous blood vessels. When the temperature rises too much (indoor trainer without a fan, ride in extreme heat, overly warm clothing, or… fever due to an infection, even a mild one), a portion of your cardiac output is “diverted” to the skin instead of the muscles. Consequence: a higher heart rate for the same intensity.
The solution: no sport when you have a fever already! This is fundamental to avoid discomfort, or even post-effort complications. A powerful fan for the indoor trainer, ice in your bottle or on your neck, light and airy clothing, and starting your ride during the coolest hours in summer.
Reason No. 4: dehydration and/or lack of sodium
When you lack water or electrolytes, blood volume decreases. To maintain the same cardiac output and irrigate your muscles, your heart must beat faster and harder. Result: 8 to 15 beats per minute more for the same power.
The solution: drink regularly from the start of the ride (150-200 ml every 15 min if the effort is longer than an hour) and add 500 to 1000 mg of sodium per liter of drink when it’s hot or the effort is long. A precaution to take imperatively before, during, and after indoor trainer sessions, of course.
Reason No. 5: stress, lack of sleep, and residual fatigue
This is the most underestimated factor. Cortisol and the sympathetic nervous system remain alert when you are stressed or have only slept 5 hours. Result: a resting heart rate that is 10 beats per minute higher in the morning and 10 to 20 beats higher during exercise.
The solution: allow yourself days of relaxation or complete rest when you are frequently dealing with major worries. A 20 to 30 min nap or a 100% recovery ride often does more for your fitness than insisting on following the training program at all costs.
But also… equipment check
Before questioning everything, check your equipment: a heart rate strap that is poorly positioned, slightly damp, or has weak batteries can significantly disrupt your heart rate measurement intermittently. Thoroughly wet the electrodes and tighten it just below your chest.
To summarize, an abnormally high heart rate is almost never a sentence, it’s a warning light on your dashboard. Correct your hydration, temperature, sleep, stimulants, or training load, and in 9 out of 10 cases, it will magically return to normal.
Listen to this signal instead of fighting it: it’s your body protecting and guiding you.
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