TY - JOUR
T1 - Implications of the Onset of Sweating on the Sweat Lactate Threshold
AU - Maeda, Yuta
AU - Okawara, Hiroki
AU - Sawada, Tomonori
AU - Nakashima, Daisuke
AU - Nagahara, Joji
AU - Fujitsuka, Haruki
AU - Ikeda, Kaito
AU - Hoshino, Sosuke
AU - Kobari, Yusuke
AU - Katsumata, Yoshinori
AU - Nakamura, Masaya
AU - Nagura, Takeo
N1 - Funding Information:
This study was funded by the Japan Agency for Medical Research and Development (award numbers: 19ek0210130h0001, 20ek0210130h0002, and 21ek0210130h0003) and the Keio University Global Research Institute IoT Healthcare Research Consortium (grant number: 02-066-0008).
Publisher Copyright:
© 2023 by the authors.
PY - 2023/4
Y1 - 2023/4
N2 - The relationship between the onset of sweating (OS) and sweat lactate threshold (sLT) assessed using a novel sweat lactate sensor remains unclear. We aimed to investigate the implications of the OS on the sLT. Forty healthy men performed an incremental cycling test. We monitored the sweat lactate, blood lactate, and local sweating rates to determine the sLT, blood LT (bLT), and OS. We defined participants with the OS during the warm-up just before the incremental test as the early perspiration (EP) group and the others as the regular perspiration (RP) group. Pearson’s correlation coefficient analysis revealed that the OS was poorly correlated with the sLT, particularly in the EP group (EP group, r = 0.12; RP group, r = 0.56). Conversely, even in the EP group, the sLT was strongly correlated with the bLT (r = 0.74); this was also the case in the RP group (r = 0.61). Bland-Altman plots showed no bias between the mean sLT and bLT (mean difference: 19.3 s). Finally, in five cases with a later OS than bLT, the sLT tended to deviate from the bLT (mean difference, 106.8 s). The sLT is a noninvasive and continuous alternative to the bLT, independent of an early OS, although a late OS may negatively affect the sLT.
AB - The relationship between the onset of sweating (OS) and sweat lactate threshold (sLT) assessed using a novel sweat lactate sensor remains unclear. We aimed to investigate the implications of the OS on the sLT. Forty healthy men performed an incremental cycling test. We monitored the sweat lactate, blood lactate, and local sweating rates to determine the sLT, blood LT (bLT), and OS. We defined participants with the OS during the warm-up just before the incremental test as the early perspiration (EP) group and the others as the regular perspiration (RP) group. Pearson’s correlation coefficient analysis revealed that the OS was poorly correlated with the sLT, particularly in the EP group (EP group, r = 0.12; RP group, r = 0.56). Conversely, even in the EP group, the sLT was strongly correlated with the bLT (r = 0.74); this was also the case in the RP group (r = 0.61). Bland-Altman plots showed no bias between the mean sLT and bLT (mean difference: 19.3 s). Finally, in five cases with a later OS than bLT, the sLT tended to deviate from the bLT (mean difference, 106.8 s). The sLT is a noninvasive and continuous alternative to the bLT, independent of an early OS, although a late OS may negatively affect the sLT.
KW - body temperature regulation
KW - exercise testing
KW - incremental exercise
KW - lactate threshold
KW - perspiration
KW - physiology
KW - sports
KW - sweat rate
KW - sweating
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U2 - 10.3390/s23073378
DO - 10.3390/s23073378
M3 - Article
C2 - 37050438
AN - SCOPUS:85152350777
SN - 1424-8220
VL - 23
JO - Sensors (Switzerland)
JF - Sensors (Switzerland)
IS - 7
M1 - 3378
ER -