Kinetic changes in sweat lactate following fatigue during constant workload exercise

Hiroki Okawara, Tomonori Sawada, Daisuke Nakashima, Yuta Maeda, Shunsuke Minoji, Takashi Morisue, Yoshinori Katsumata, Morio Matsumoto, Masaya Nakamura, Takeo Nagura

Research output: Contribution to journalArticlepeer-review

Abstract

It is useful to investigate various physiological responses induced by fatigue in athletes. Moreover, wearable noninvasive sensors, including sweat sensors, are compatible with fatigue evaluation because of their ease of use, and ability to measure repeatedly and continual data. This cross-sectional study aimed to clarify how sweat lactate elimination curves obtained during constant workload exercise changed following fatigue. Seventeen recreationally trained males (average age, 20.6 ± 0.8 years) completed two consecutive constant workload exercise tests (at 25% peak power) with rest intervals; the participants were encouraged to perform Test 1 until exhaustion and Test 2 only for 10 min. Subjective fatigue (numerical rating scale with face rating scale), sweat lactate, and sweat rate were measured for 10 min in each test. Subjective fatigue was compared using the Wilcoxon signed-rank test and time to each constant value between Tests 1 and 2 was compared using paired t-test. Subjective fatigue significantly increased during Test 2 compared with that during Test 1. After Test 1, the sweat lactate elimination curve demonstrated a leftward shift, as proved by the significantly sooner observation of the peak and constant values of sweat lactate (2, 3, and 4 μA) (p < 0.01). Our preliminary results suggest that the sweat lactate elimination curve is different in the fatigue state. Further research may provide insight in the application of this curve to the evaluation for fatigue.

Original languageEnglish
Article numbere15169
JournalPhysiological Reports
Volume10
Issue number2
DOIs
Publication statusPublished - 2022 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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