A sensor that reads sweat faces a practical problem during exercise: there can be too little fluid to measure at rest and too much during intense activity. Researchers have developed a textile patch designed to handle both. Nature Communications (source, opens in new tab)
Nature CommunicationsAn intelligent electronic-textile system with adaptive sweat-regulation for continuous exercise-induced fatigue monitoringOpen source (opens in new tab)
The patch is part of FatigueVisual, an experimental system described in the journal Nature Communications. Tiny pores concentrate small amounts of sweat where measurements are taken and drain excess fluid when sweating increases. The aim is to keep collecting usable measurements as a person moves between exercise and rest.
Worn on the thigh, the patch measures substances in sweat alongside the muscles’ electrical activity. Computer models then use those signals to estimate six fatigue-related factors, including hydration and muscle fatigue. The distinction matters: the sensors collect measurements, while the models interpret what they might mean.
The researchers trained the models using data from ten healthy young adults. However, the subsequent experiment assessing their classifications and their use to guide exercise and supplementation involved only three participants. This is an early demonstration, not evidence that the system can reliably tell athletes when they have recovered.
The models assign one of three severity grades to each of the six factors. Their inputs include measurements of glucose, lactate and other substances in sweat, together with muscle electrical activity. These readings provide the information used to calculate the grades; they do not directly measure a person’s overall fatigue.
The collected dataset contained approximately 260,000 observations recorded over time from participants aged 23–30. That is a large number of measurements from a small number of people. In the subsequent three-participant experiment, the paper reported average agreement of 87.3% between the models’ classifications and assessments described by the researchers as clinical or traditional fatigue-scoring methods.
In that experiment, each participant served as their own comparison. The researchers reported that monitoring-guided exercise and supplementation reduced a combined fatigue score by up to 51.8% compared with the no-intervention condition. That score averages the severity grades assigned by the models: the percentage describes a change in their calculated score, not a directly measured reduction in how fatigued participants were.
The study brings sweat management and the interpretation of several bodily signals into one wearable system. The next question is whether it can produce useful guidance beyond a controlled experiment. The authors identify testing in larger groups, during weeks of wear and in real-world athletic settings as work still to be done.
- Nature Communications · Peer-reviewed studyAn intelligent electronic-textile system with adaptive sweat-regulation for continuous exercise-induced fatigue monitoringpmc.ncbi.nlm.nih.gov · opens in new tab
