Band training blood markers are not a recovery score
In short
After eight weeks, band training was associated with lower serum CoQ10 in a small tennis study: 24 players were allocated and 23 analyzed. The non-randomized comparison does not establish poorer recovery or a need for supplements.
A lower blood CoQ10 result is not the same finding as worse recovery. In a study published on October 21, 2026, serum CoQ10 in the elastic-band group fell from 16.6±4.3 to 8.3±1.9ng/mL. That observation does not establish that the program reduced strength, damaged tissue, or created a need for CoQ10 supplementation. Each of those claims would require evidence about a different outcome.
Who was compared, and when was blood sampled?
The exploratory study allocated 24 collegiate tennis players to habitual tennis alone, additional elastic-band resistance training, or additional plyometric training. Allocation was matched but not randomized. After eight weeks, 23 players were analyzed: eight controls, seven in the band group, and eight in the plyometric group. Fasting serum was collected approximately 24 hours after the final session. The result therefore describes circulating markers at that sampling point, rather than a continuous measure of how recovered each athlete was.
What changed in the blood-marker comparison?
| Marker | Observed result | Interpretation limit |
|---|---|---|
| CoQ10 | Lower with bands than with control or plyometrics | Does not directly establish worse recovery or strength loss |
| TIMP-1 | Lower adjusted values in both added-training groups | Reflected an increase in controls, not a training-related fall |
| TIMP-2 | Lower with bands than in both comparison groups | Not confirmed in the rank-based analysis |
| MMP-9 and MMP-2 | MMP-9 fell across all groups; MMP-2 did not change | The MMP-9 change was not specific to band training |
For baseline-adjusted CoQ10, the band-versus-control difference was Hedges’ g −0.86, with a 95% confidence interval of −1.47 to −0.26. Against plyometrics, g was −0.80, with an interval of −1.48 to −0.12. Those estimates describe the marker comparison, not the size of a recovery deficit. The small, non-randomized design limits causal interpretation. The authors called for adequately powered randomized trials and chromatographic CoQ10 measurement to test these preliminary findings.
What belongs in a fairlift training record?
- Compare band repetitions using the same band, stretch length, and movement range.
- Track barbell load and repetitions separately, comparing the same exercise under similar conditions.
- Treat blood results as separate context rather than converting a marker change into a training-performance or recovery score.
Assigning an arbitrary kilogram value to a band and merging it with barbell work hides what actually improved. The distinction between a measured strength outcome and wider performance also appears in our article on band training and knee strength. The Muscle Index calculator uses big-three 1RM values; serum CoQ10 and band repetitions cannot replace them. A useful record keeps the measurement attached to its method. A blood marker may change while the training log answers a separate question about what a person could lift.
This was an exploratory comparison of circulating markers, not a diagnosis of tissue damage, poor recovery, or nutritional deficiency. It did not test CoQ10 supplementation. No extra marker changes detected with plyometrics also does not prove no effect: the study could detect only very large effects.
Frequently asked questions
Did band training worsen recovery?
This study does not establish worse recovery. It compared blood markers after eight weeks; a serum-marker difference is a different outcome from recovery or strength loss.
Should I take a CoQ10 supplement?
The study did not test the need for supplementation or its effects. A decrease in serum CoQ10 in one training group is insufficient evidence to recommend a supplement.
Did training reduce TIMP-1?
Adjusted TIMP-1 was lower in both added-training groups than in controls, but the difference reflected an increase in the control group. Describing it as a fall caused by training would misstate the finding.
Can blood results be included in Muscle Index?
Muscle Index uses big-three 1RM values rather than blood markers. Band work and barbell work should each be compared using records collected under consistent exercise conditions.
Source: PubMed · Metabolites (published )