EXERCISE AND HYPOXIC EFFECTS ON FATIGUE MANIFESTATIONS IN HUMAN SKELETAL MUSCLE
Bibliographic record
Abstract
To determine the role of exercise, as modified by hypoxia, on fatigue development and recovery, 8 untrained volunteers (age = 20.1 ± 0.66 yr; x ± SE) performed knee extension isometric exercise for 60 min followed by 30 min of recovery during both normoxia (N) and hypoxia (H; FI 02 = 0.14). The exercise was performed at 50% of maximal voluntary contraction (MVC) and 50% duty cycle (5 s contraction and 5 s recovery). Fatigue was assessed both by changes in MVC and at different frequencies of transclutaneous electrical stimulation. Repetitive activity resulted in both a time dependent loss of MVC and 100 Hz torque. For 10 Hz, an initial increase in torque was observed at 5 min of exercise followed by progressive decreases. No further changes in force were observed during the recovery period regardless of the property assessed. During H both MVC and 100 Hz torque were persistently lower than H regardless of time. E = exercise; R = recovery These results demonstrate that hypoxia impairs force production but only at high force outputs, an effect that occurs prior to exercise and which persists throughout exercise and recovery. Supported by NSERC (Canada)Table
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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 | 0.000 |
| 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) | 0.001 | 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".