Beyond Circulating Cytokines: Impact Of Exercise Intensity On Anti-inflammatory Cytokine Action In Monocytes And Lymphocytes
Bibliographic record
Abstract
Exercise-induced changes in circulating cytokine concentrations are widely used to support the anti-inflammatory effects of exercise. However, circulating cytokines do not capture important functional changes in cytokine action occurring at the cellular level. PURPOSE: To test the novel hypothesis that anti-inflammatory cytokine signaling in blood leukocytes - directly reflecting cellular cytokine action - is altered in an exercise intensity-dependent manner. METHODS: Active young adults completed a no-exercise control session (CTRL) or two exercise sessions involving work-matched (350 kcal) continuous cycling above (heavy intensity continuous exercise; HICE) or below (moderate intensity continuous exercise; MICE) lactate threshold in a counterbalanced crossover design with serial intravenous blood samples obtained before and after exercise. Changes in major immune cell subtypes were quantified using a hematology analyzer and phosphorylation of signal transducer and activation of transcription 3 (STAT3; a key intracellular transducer of anti-inflammatory cytokine action) was measured using flow cytometry following interleukin (IL)-6 (10 ng/mL) and IL-10 (100 ng/mL) stimulation of blood leukocytes ex vivo. RESULTS: Preliminary data from 6 participants (5 males, 1 female; age: 29 ± 2 years, BMI: 25 ± 2 kg/m2; VO2peak: 51 ± 5 ml/kg/min), revealed increases in total white blood cells (~48%), lymphocytes (~70%), monocytes (~38%), and neutrophils (~37%) immediately following HICE (p < 0.05), with no corresponding changes over time in CTRL (p > 0.49) or MICE (p > 0.12). IL-6 and IL-10 mediated STAT3 phosphorylation in CD14+ monocytes and CD4+ lymphocytes was reduced (~15-20%) immediately and 90 minutes following HICE (both p < 0.05). No changes in IL-10 or IL-6 mediated STAT3 phosphorylation were apparent over time in CTRL (p > 0.3) or MICE (p > 0.07). CONCLUSIONS: Contrary to the well documented increases in anti-inflammatory cytokine concentrations after exercise, our preliminary observations suggest that the ability of IL-6 and IL-10 to activate anti-inflammatory signaling pathways may be transiently blunted following acute heavy intensity exercise. Further work is needed to provide insight into the mechanisms and consequences of reduced anti-inflammatory cytokine signaling following HICE.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".