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. 2025 Jul 30:16:99-105.
doi: 10.2147/OAJSM.S534243. eCollection 2025.

Short Report: Estimating Blood Lactate Dynamics from Sweat Lactate and Sweat Rate After High-Intensity Exercise - A Pilot Regression-Based Study

Masaaki Hattori  1 , Kazuya Yashiro  2
Affiliations

Short Report: Estimating Blood Lactate Dynamics from Sweat Lactate and Sweat Rate After High-Intensity Exercise - A Pilot Regression-Based Study

Masaaki Hattori et al. Open Access J Sports Med. .

Abstract

Background: Blood lactate (BL) is a critical biomarker for assessing anaerobic metabolism and fatigue. Sweat lactate (SWL) and sweat rate (SWR) have been explored as non-invasive alternatives, but their capacity to estimate BL dynamics after short-term high-intensity exercise remains unclear.

Purpose: This pilot study aimed to evaluate whether BL dynamics can be predicted using a regression model based on the time-series patterns of SWL and SWR measured by wearable sensors.

Methods: Five healthy male athletes (three sprinters and two endurance runners) performed a 30-second Wingate anaerobic test. SWL and SWR were continuously monitored using a wearable electrochemical sensor and a ventilated capsule-type sweat rate meter. Capillary BL was sampled for 30 minutes post-exercise.

Results: BL showed a delayed peak at 6.4 ± 1.2 min, while SWL and SWR exhibited biphasic responses. The second SWL peak (7.5 ± 2.2 min) aligned with the BL peak. Although peak-based correlations were not significant, Pearson correlations using time-series data revealed strong associations (r = 0.501-0.933 for SWL; r = 0.515-0.805 for SWR; all p < 0.001). A multivariate regression model using both variables predicted BL with high accuracy (R² = 0.763, RMSE = 1.612, MAE = 0.995, p < 0.001).

Conclusion: These findings support the feasibility of a regression-based approach using sweat-derived time-series data to non-invasively estimate BL dynamics after high-intensity exercise.

Keywords: blood lactate; high-intensity exercise; non-invasive; sweat lactate; sweat rate; wearable sensor.

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Conflict of interest statement

The author(s) report no conflicts of interest in this work.

Figures

Figure 1
Figure 1
Time course of blood lactate concentration, sweat lactate, and sweat rate during and after WAnT.
Figure 2
Figure 2
Time course of blood lactate (BL) with two-term exponential fitting and predicted concentrations following high-intensity exercise.
See this image and copyright information in PMC

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