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Saliva cell-free mitochondrial DNA (cf-mtDNA) increases in response to acute physical and cognitive stress, with individual differences linked to fitness, sleep quality, and stress perception.

In a crossover study of 47 participants, saliva cf-mtDNA levels increased by 90% after baseline during exercise and peaked 160% above baseline during cognitive stress. Higher cf-mtDNA elevations during exercise were associated with fewer recent stressful incidents, lower alcohol use, higher VO2 max, and lower BMI; more dynamic responses to cognitive stress were seen in those with poorer sleep quality and greater blood pressure reactivity.

Last updated: Jul 23, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Saliva cell-free mitochondrial DNA (cf-mtDNA) response during physical and cognitive stress.

observational

Trumpff C, Shire D, Wang T, Wang S, Yu T, Picard M, Ginty AT · medRxiv : the preprint server for health sciences (2026)

Participants: N/A
Duration: Not specified (single session experiments)
Intervention: Acute physical (exercise) and cognitive stress tasks, with exploration of transcranial infrared laser stimulation (TILS) modulatory effects.
Outcome: Saliva cell-free mitochondrial DNA (cf-mtDNA) and cell-free nuclear DNA (cf-nDNA) levels, heart rate, oxygen consumption, blood pressure.
Effect Size: N/A
Population: 47 participants (53% female, ages 18-30).

Result:

PubMed: 42465913DOI: 10.64898/2026.07.02.26356953

Mechanism Graph

Acute stress exposure
↓
Activation of physiological stress response
↓
Release of mitochondrial DNA into saliva
↓
Elevated cf-mtDNA levels

Limitations

  • ⚠Preprint study not yet peer-reviewed
  • ⚠Small sample size (n=47) limits generalizability
  • ⚠Causal mechanisms not established; observational associations only

Frequently Asked Questions

What is saliva cf-mtDNA?▼

Saliva cell-free mitochondrial DNA is mitochondrial DNA found in saliva that is not contained within cells, and its levels may increase in response to stress.

How much did cf-mtDNA increase during exercise?▼

Average cf-mtDNA levels increased by 90% after baseline during exercise experiments.

What factors predicted higher cf-mtDNA responses?▼

Higher cf-mtDNA during exercise was linked to fewer stressful incidents, less alcohol use, higher fitness (VO2 max), and lower BMI; during cognitive stress, poorer sleep quality and greater blood pressure reactivity predicted more dynamic responses.

Was this study a randomized controlled trial?▼

No, it was a crossover design study with 47 participants, not a full RCT, and the paper is a preprint.

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References

  1. 1.Trumpff C, Shire D, Wang T, Wang S, Yu T, Picard M, Ginty AT. "Saliva cell-free mitochondrial DNA (cf-mtDNA) response during physical and cognitive stress.." medRxiv : the preprint server for health sciences, 2026. PMID: 42465913 DOI: 10.64898/2026.07.02.26356953
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.