Every cyclist has days when motivation is missing and the legs feel like wet cement. Most of the time, it’s just fatigue from training, work and life piling up. But occasionally that “off day” is something deeper — a sign you’re pushing too far. A recent study on recreational athletes, published in the European Journal of Science and Sport, offers clues on how to tell the difference between ordinary tiredness and the early stages of overtraining.
The study behind the findings
Researchers followed 24 athletes through three phases: three weeks of normal training, two weeks of heavy overload and one week of recovery. They tracked both heart-rate data (resting heart rate and heart-rate variability (HRV), recorded at night) and subjective measures, such as soreness, sleep quality and “readiness to train.”
When the intensity spiked by roughly 80 per cent, half the group adapted and got stronger, while the rest hit a wall. Despite all the extra work, their time-trial performances slowed slightly — a state known as functional overreaching. The combination of nighttime heart rate, HR-effort index and readiness-to-train scores correctly identified who was struggling with more than 90 per cent accuracy.
Elisabeth Scott, coach and host of the podcast Running Explained, says: “The study shows that both heart data and how you feel are powerful indicators of fatigue. Neither alone gives the full picture — but together they can help you train smarter and avoid burnout.”
What happens when you overreach
The athletes who faltered not only felt sore, but their bodies showed measurable stress. Average nighttime heart rate rose about three per cent, while heart-rate variability dropped. Sleep quality worsened and motivation plummeted. Others, however, thrived under the same load, showing lower heart rates and slightly improved HRV — proof that recovery capacity is highly individual.
“Fatigue is personal,” Scott explains. “Two athletes can follow identical programs, and one will thrive while the other crashes. It’s not about toughness; it’s about how your system handles stress and recovery.”
“Your feelings are data. When motivation disappears or everything feels harder than it should, your body is sending you useful information,” says Scott.
Heart data meets real-world feelings
The heart doesn’t lie, but it can whisper instead of shout. A single elevated reading…
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