No evidence for metabolic adaptation during exercise-related energy compensation.
Level 2 - randomized trial
Individual randomized controlled trial.
PubMed 38947494 · doi:10.1016/j.isci.2024.109842
What was done
Participants were evaluated during a 24-week randomized controlled exercise intervention. Changes across components of total daily energy expenditure (TDEE) and metabolic adaptation were measured using 14-day doubly labeled water and 24-hour room calorimetry to assess whether exercise-related energy compensation (ExEC) involves reductions in basal or sedentary metabolic rates.
What was found
ExEC occurred in 48% of participants, averaging -308 ± 158 kcal/day. ExEC was negatively correlated with baseline TDEE (r = -0.50, p = 0.006). There were no statistically significant differences in age, sex, or BMI between individuals who compensated and those who did not. No statistically significant differences in metabolic adaptation were observed for 24-hour, sleeping, or resting energy expenditures between groups.
Why it matters
These findings suggest that when TDEE fails to increase proportionally to exercise volume, the underlying compensation is not mediated by down-regulation of resting or sleeping metabolic rates (metabolic adaptation).
Limits
The total sample size, participant demographics, and specific exercise prescriptions are not provided in the abstract. The study leaves non-resting behavioral adjustments (such as spontaneous non-exercise physical activity) as the presumed driver without directly detailing them in the abstract.
Cited by
- supports Adaptive thermogenesis can cause the body to downregulate non-exercise energy expenditure by 300 to 500 calories in response to 500 calories burned through exercise.