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Purpose <p>(1) To determine if the blood lactate concentration ([BLa]) response is a repeatable individual trait, and (2) To examine whether threshold-based prescription (THR) reduces interindividual variability in [BLa] response compared to traditional (maximally anchored) exercise prescription (TRAD).</p> Method <p>A crossover within-participant repeated measures design was used to assess [BLa] during the TRAD and THR exercise in 17 participants (9&#xa0;M/8F). Participants initially undertook an incremental test to exhaustion to determine peak work rate (WRpeak), a lactate threshold (LT) test and a critical power (CP) test. All baseline tests were repeated twice. Participants then completed 6 15-min bouts of continuous cycling at 65%WRpeak (TRAD; 3 bouts) and 80% of the difference (Δ80) between LT and CP (THR; 3 bouts). [BLa] response was measured at 10 and 15&#xa0;min of exercise.</p> Results <p>Across individuals, there was a wide range in [BLa] response, but within individual responses were repeatable. [BLa] ranges and mean individual 90% confidence interval width (CI<sub>w</sub>) were as follows: TRAD@10&#xa0;min = 2.1–9.7&#xa0;mmol, CI<sub>w</sub> = 0.5&#xa0;mmol, THR@10&#xa0;min = 3.4–9.3&#xa0;mmol, CI<sub>w</sub> = 0.6&#xa0;mmol, TRAD@15&#xa0;min = 2.2–9.9&#xa0;mmol, CI<sub>w</sub> = 0.6&#xa0;mmol, THR@15&#xa0;min = 3.6–12.3&#xa0;mmol, CI<sub>w</sub> = 0.7&#xa0;mmol. Levene’s tests revealed no significant differences in the variability of [BLa] response between TRAD and THR at 10&#xa0;min (F = 0.523, <i>p</i> = 0.475) or 15&#xa0;min (F = 0.351, <i>p</i> = 0.558) of exercise.</p> Conclusion <p>Our results demonstrate that true interindividual variability in the [BLa] response to exercise exists, but failed to confirm that variability in [BLa] response is reduced with the use of THR.</p>

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Individual variability in lactate response to cycling prescribed using physiological thresholds and peak work rate: a crossover within-participant repeated measures study

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Lauren J. Pacitti,
  • Kaitlyn E. Shikaze,
  • Nia Simpson-Stairs,
  • Jonathan Stringer,
  • Brendon J. Gurd

摘要

Purpose

(1) To determine if the blood lactate concentration ([BLa]) response is a repeatable individual trait, and (2) To examine whether threshold-based prescription (THR) reduces interindividual variability in [BLa] response compared to traditional (maximally anchored) exercise prescription (TRAD).

Method

A crossover within-participant repeated measures design was used to assess [BLa] during the TRAD and THR exercise in 17 participants (9 M/8F). Participants initially undertook an incremental test to exhaustion to determine peak work rate (WRpeak), a lactate threshold (LT) test and a critical power (CP) test. All baseline tests were repeated twice. Participants then completed 6 15-min bouts of continuous cycling at 65%WRpeak (TRAD; 3 bouts) and 80% of the difference (Δ80) between LT and CP (THR; 3 bouts). [BLa] response was measured at 10 and 15 min of exercise.

Results

Across individuals, there was a wide range in [BLa] response, but within individual responses were repeatable. [BLa] ranges and mean individual 90% confidence interval width (CIw) were as follows: TRAD@10 min = 2.1–9.7 mmol, CIw = 0.5 mmol, THR@10 min = 3.4–9.3 mmol, CIw = 0.6 mmol, TRAD@15 min = 2.2–9.9 mmol, CIw = 0.6 mmol, THR@15 min = 3.6–12.3 mmol, CIw = 0.7 mmol. Levene’s tests revealed no significant differences in the variability of [BLa] response between TRAD and THR at 10 min (F = 0.523, p = 0.475) or 15 min (F = 0.351, p = 0.558) of exercise.

Conclusion

Our results demonstrate that true interindividual variability in the [BLa] response to exercise exists, but failed to confirm that variability in [BLa] response is reduced with the use of THR.