Last Updated on 18 September 2026:
More training does not always mean a proportionally higher daily calorie burn. Constrained total energy expenditure is the idea that, as activity rises, the body may compensate by reducing energy spent elsewhere. For endurance athletes, understanding this can help put training load, recovery and fuelling into better context.
Covered in this blog
- What is Total Energy Expenditure (TEE)?
- The concept of Constrained Total Energy Expenditure
- Key studies on Constrained TEE
- How to body compensates
- Constrained total energy expenditure implications
- Practical tips for athletes
- Summary
- References
What is Total Energy Expenditure?
Total Energy Expenditure (TEE) is the sum of all the energy an individual uses in a day. It includes:
- Basal metabolic rate (BMR): The energy your body needs at rest to maintain basic physiological functions.
- Thermic effect of food (TEF): The energy required to digest and metabolise food.
- Physical activity energy expenditure (PAEE): The energy used in all physical activities.
Traditionally, it was believed that increasing physical activity linearly increased TEE. However, recent research suggests a more complex scenario.
The concept of Constrained Total Energy Expenditure
The concept of Constrained TEE proposes that beyond a certain point, the body adjusts to limit total energy expenditure, even if physical activity levels increase. This idea is rooted in the body’s energy budget and how it prioritises energy allocation to ensure survival and reproductive success.
Key studies on Constrained TEE
One pivotal study by Pontzer et al. (2016) examined the Hadza, a traditional hunter-gatherer population. Despite their high levels of physical activity, the Hadza’s TEE was similar to that of more sedentary Western populations. This finding suggests that human energy expenditure may be constrained and that the body compensates for increased activity by reducing energy spent on other physiological processes.
Another study by Pontzer (2015) in the journal Current Biology highlighted that daily energy expenditure plateaus at higher activity levels, supporting the idea of constrained TEE.
How the body compensates
To understand constrained TEE, it’s essential to grasp how the body reallocates energy to maintain a balance:
- Energy trade-offs: When physical activity increases significantly, the body reduces energy allocation to other functions such as immune response, stress responses, and reproductive functions.
- Metabolic adaptation: The body becomes more efficient in its energy use, meaning it can perform the same physical activities with less energy expenditure.
Constrained total energy expenditure implications
Understanding constrained TEE has significant implications for training and nutrition strategies.
- Training load management:
- Efficiency over volume: For endurance athletes, more training doesn’t always equate to higher energy expenditure. Focus on the efficiency of workouts rather than just increasing volume.
- Recovery is key: Since the body limits total energy expenditure, adequate recovery becomes crucial to avoid overtraining and injury.
- Nutrition strategies:
- Balanced diet: Ensure a well-rounded diet that meets energy needs without over-relying on the assumption that more activity means significantly more calories required.
- Strategic refuelling: Pay attention to nutrient timing to maximise recovery and performance, especially around training sessions.
- Long-term health considerations:
- Avoiding burnout: By acknowledging the limits of TEE, athletes can avoid chronic fatigue and burnout, maintaining a healthier balance between training and recovery.
- Hormonal health: Understanding constrained TEE helps in maintaining hormonal balance, essential for long-term health and performance.
Practical tips for athletes
- Monitor and adjust: Use tools like heart rate monitors and power meters to gauge training intensity and make necessary adjustments.
- Periodise training: Incorporate phases of lower intensity and volume to allow the body to recover and adapt.
- Stay informed: Keep up with the latest research to understand how your body may be compensating and adapt your training accordingly.
Summary
Use this concept as one part of the bigger picture when balancing training volume, recovery and nutrition. If you would like help applying those principles to your own riding, Book a Free Consultation.
