Within-athlete association between morning on-track peak heart rate and same-day pre-performance salivary cortisol change under dry-track conditions: a multi-season single-case field study in a professional formula racing driver
Matsumura et al.
The finding, in our words
Morning peak heart rate measured by a wearable ECG device was positively correlated with the change in pre‑performance salivary cortisol on the same day under dry‑track conditions in a single professional racing driver (r = 0.72 across 18 race‑day observations). The association suggests wearable heart‑rate data may serve as an immediately available field signal of cardiovascular load linked to later endocrine variation, but it is limited to one athlete, does not establish causality, and should not be used as a stress‑specific marker or decision rule.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
Older adults with and without cognitive impairment were motivated to participate in longitudinal remote sleep research, finding it acceptable when device burden was low, usability high, and adequate support enabled routine integration. Varying cognitive task content and allowing timing flexibility reduced fatigue, while diverse recruitment remains needed for equitable representation in decentralised dementia trials.
Biswas et al., Journal of medical Internet research · source ↗
Wearable biochemical monitoring requires a complete measurement chain that integrates quality-controlled biofluid sampling, sensor fusion and metadata capture to convert raw sensor outputs into clinically valid digital biomarkers.
In a 14-day study of youth with neurodevelopmental conditions and chronic pain, multimodal in-home monitoring achieved good accelerometer wear compliance (77% wore devices for at least 7 days) and moderate survey engagement, but adherence to salivary cortisol sampling was low at 28% after excluding protocol violations and dry swabs. Families reported high overall satisfaction and willingness to participate again, highlighting that remote sampling protocols in pediatric populations require iterative tailoring to improve biospecimen collection adherence.
Boerner et al., Journal of developmental and behavioral pediatrics : JDBP · source ↗
The authors developed a flexible aptamer-based field-effect transistor biosensor that detects nanomolar cortisol in sweat. Validated in humans during a Trier Social Stress Test, it showed correlation with salivary cortisol and enabled continuous stress monitoring via a smartwatch platform.
This review establishes that microsampling across blood, saliva, urine and stool matrices offers validated workflows and regulatory recognition for human biomonitoring comparable to conventional methods. It finds that these decentralised approaches enhance participant acceptability and enable screening in remote or low-resource settings.