Calorimetric Evidence for an Exercise Intensity Dependent Increase in the Level of Postexercise Hyperthermia
Bibliographic record
Abstract
Studies show that, in parallel to the rapid decrease in metabolic heat production following cessation of exercise, there is a rapid decline in local skin blood flow and sweating to pre-exercise levels during the early stages of recovery. Consequently, a prolonged sustained elevation of core and muscle temperature relative to pre-exercise rest, which is dependent upon the intensity of exercise, is evidenced. It is unclear, however, if this pattern of response is due to a greater thermal inertia (i.e., the time taken to balance the differential rates of heat production and heat loss) during exercise as opposed to during recovery. PURPOSE: We investigated heat balance during and following exercise of different intensities using a whole-body calorimeter regulated to an ambient air temperature of 30°C. METHODS: Six physically active males performed 60-min of cycling at a constant rate of metabolic heat production of either: 1) 200 (L); 2) 350 (M) or; 3) 500 (H) Watts followed by 60-min of seated rest. RESULTS: Exercise resulted in a change in body heat content of +227±37, +308±40 and +396±31 kJ for the L, M and H exercise conditions respectively. Values were significantly different between L and H only (p<0.05). This was paralleled by a corresponding increase in rectal temperature of 0.18±07, 0.56±11 and 0.84±06°C for L, M and H respectively. Postexercise, there were no differences in the rates of metabolic heat production and whole-body heat loss between the three conditions. Consequently, the magnitude of change of body heat content was similar between conditions (i.e., -46±6, -56±8, and -70±8 kJ for L, M and H respectively). Only ∼21, 19 and 18% of the change in body heat content during exercise was dissipated postexercise for L, M and H respectively. This was paralleled by a sustained elevation in rectal temperature above baseline resting equal to 0.15±0.04, 0.30±0.06 and 0.41±0.09°C for the L, M and H conditions respectively. CONCLUSIONS: The exercise intensity dependent increase in the postexercise elevation in core temperature is likely associated with a greater thermal inertia during recovery and not exercise. Funding support from the Natural Sciences and Engineering Research Council of Canada.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".