Massage Impairs Rather Than Enhances Lactic Acid Removal From Muscle After Strenuous Exercise
Bibliographic record
Abstract
Sports massage has been widely accepted among the athletic community as an aid to promote muscle recovery from exercise. The Canadian Sports Massage Therapists Association (CSMTA) website (www.csmta.ca) states that it "relieves soreness and assists in the removal of lactic acid and other waste products“. To date no studies have investigated the claim about lactic acid removal. PURPOSE: To test the hypothesis that massage improves muscle lactic acid removal post exercise. METHODS: Twelve healthy young University undergraduate male subjects lay supine and performed 2 min of isometric handgrip at 40% maximal voluntary contraction (MVC). Forearm blood flow (FBF; Doppler and Echo ultrasound of the brachial artery) and deep venous forearm blood lactate concentration (DV[La-]; StatProfile M Blood Gas Analyzer, Nova Biomedical) were measured every 30 s for 10 min post-handgrip under three conditions: Control (passive rest), Massage (effleurage and petrissage), and Active Recovery (rhythmic exercise at 10% MVC). RESULTS: Data are mean ±SE. DV[La-] at 30 s post handgrip increased by a similar amount above baseline across conditions (Control 6.1 ±0.5, Massage 5.5 ±0.6, Active Recovery 5.7 ±0.6 mmol/L). From 4.5 min post handgrip onwards, it was lower in Active Recovery than Control or Massage, P<0.05. FBF was highest in Control vs. Massage and Active Recovery for the first 3.5 min post-handgrip, all P<0.05. Examination of beat by beat flow tracings revealed markedly reduced flow during limb compression with rhythmic Massage and during the contraction phase of rhythmic exercise in Active Recovery. Total FBF area under the curve (AUC; ml) for 10 min post handgrip was significantly higher in Control vs. Massage (4203 ±531 vs. 3178 ±304) but not vs. Active Recovery (3584 ±284, P=0.217). La- efflux (mmol; FBF x DV[La-]) AUC mirrored FBF AUC (Control 20.5 ±2.8 vs. Massage 14.7 ±1.6, P=0.03 vs. Active Recovery 15.4 ±1.9, P=0.064). CONCLUSIONS: Massage impairs lactic acid removal from muscle following strenuous exercise by mechanically impeding blood flow.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 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".