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Takemoto, A., Okawara, H., Sudo, T., Sawada, T., Hirakawa, R., Muramoto, Y., … Nakashima, D. (2025). A novel fatigue monitoring system using sweat lactate: a preliminary study. Fatigue: Biomedicine, Health & Behavior, 1–15. https://doi.org/10.1080/21641846.2025.2554557
Research Article
A novel fatigue monitoring system using sweat lactate: a preliminary study
Ayumu Takemoto,
Hiroki Okawara
,
Tsubasa Sudo
,
Tomonori Sawada
,
Rei Hirakawa
,
Yuki Muramoto
, show all
Received 27 Jan 2025, Accepted 27 Aug 2025, Published online: 07 Sep 2025
ABSTRACT
Objective
To elucidate the feasibility of a novel fatigue-monitoring system in athletes using sweat lactate (sLA) sensors.Methods
Eighteen college soccer players (mean age: 21 years; range: 19–23 years) underwent incremental exercise tests conducted until 2 min after the putative ventilation threshold (VT) – determined in real-time. Each player performed two tests before and one 2 days after the soccer match, yielding a sweat lactate threshold (sLT) and VT in each test. The pre-match test-retest measurement was used to investigate the interclass correlation coefficients (ICCs) and minimal detectable change with 95% confidence (MDC95) for sLT and VT. The relationships between match demands and changes in sLT or VT from pre- to post-match were analyzed as a fatigue indicator.Results
The ICCs with 95% confidence intervals for the VT and sLT were 0.719 (0.401–0.884) and 0.777 (0.506–0.910), respectively. sLT changes moderately correlated with high-speed distance (r = 0.64, p < 0.05) and VT change (r = 0.77, p < 0.05). sLT changes above each MDC95 also exhibited moderate correlation with high-speed distance (VT: r = 0.64, p = 0.01; sLT: r = 0.63, p = 0.02).Conclusions
These findings demonstrate the capability of continuous sLT assessment for fatigue monitoring, expanding its potential applications in injury prevention and optimizing training strategies.KEYWORDS:
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