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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
The Influence of Sampling Site on Blood Lactate Response to Steady State Exercise
Author(s)
Takashi Yamagata1, Daisuke Kume2, Toshihiro Wakimoto3 and Noriki Nagao4
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DOI:10.17265/2332-7839/2018.05.003
Affiliation(s)
1. Department of Human Sciences and Design, Japan Women’s University, Tokyo 112-8681, Japan
2. Department of Health, Sports and Welfare, Okinawa University, Okinawa 902-8521, Japan
3. Department of Health and Sports Science, Kawasaki University of Medical Welfare, Kurashiki, Okayama 701-0193, Japan
4. Department of Health System Management, Hyogo University, Hyogo 675-0195, Japan
ABSTRACT
In sports sciences, blood lactate is commonly measured for performance
testing or setting exercise intensity. Differences in measuring lactate
concentration over time and across sampling sites during constant exercise are
unknown. We aimed to compare blood lactate concentration across sampling sites
during constant exercise. Eight participants performed three bouts of 20-min
steady-state cycle exercise, consisting of 45, 60, and 75% of peak oxygen
uptake (VO2peak). Blood
lactate levels were measured simultaneously from the fingertip and earlobe
every 5 min during exercise. The time course analysis revealed that lactate
level in the fingertip was significantly higher than in the earlobe at either
work intensity (P < 0.05). A
significant interaction effect (site x time)
was observed at 60% VO2peak (P < 0.001), which indicated that
the difference in samples across sampling sites decreased over time. The levels
in the fingertip samples were higher at 5 min (P < 0.05); this difference was not noted after 10 min.
Similarly, the fingertip values were significantly higher until 10 min (P < 0.05), but not after 15 min at
75% VO2peak. These findings
suggest that the sampling site may affect the time course of change in lactate
value under a constant workload.
KEYWORDS
Lactic acid, constant work, cycle ergometry, lactate steady state.
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