Research Article

Applicability of Dmax Method on Heart Rate Variability to Estimate the Lactate Thresholds in Male Runners

Table 1

Aerobic and anaerobic thresholds expressed as absolute and relative (mean ± SD) values for speed, blood lactate concentrations, milliseconds beat-to-beat RR intervals, and heart rate during maximal running test among trained male runners.

SpeedLactateRRHR
(km·h−1)%a(mmol·L−1)%a(ms)%b(bpm)%a

HRVTDMAX112.1 ± 1.473.4 ± 7.32.2 ± 0.832.7 ± 9.4379.4 ± 3854.1 ± 5.2159 ± 1583.0 ± 7.7
(95% CI)(11.4–12.7)(69.9–77.0)(1.8–2.6)(28.2–37.2)(360.9–398.0)(51.6–56.6)(151–167)(79.3–86.7)
HRVTDMAX212.0 ± 1.272.9 ± 7.42.3 ± 1.233.4 ± 15.0383.6 ± 4154.6 ± 4.5158 ± 1782.2 ± 7.9
(95% CI)(11.3–12.6)(69.3–76.5)(1.7–2.9)(26.1–40.7)(363.8–403.4)(52.4–56.8)(149–166)(78.4–86.1)
LT111.2 ± 2.167.7 ± 7.61.7 ± 0.524.7 ± 8.5397.9 ± 3856.8 ± 5.6151 ± 1478.8 ± 6.3
(95% CI)(10.2–12.3)(64.1–71.4)(1.4–2.0)(20.6–28.8)(379.3–416.5)(54.0–59.5)(144–158)(75.8–81.9)
LT214.1 ± 2.185.2 ± 4.92.9 ± 0.533.5 ± 6.2356.7 ± 3751.0 ± 5.9173 ± 990.0 ± 3.8
(95% CI)(13.0–15.1)(82.8–87.5)(2.7–3.2)(30.5–36.5)(338.4–375.0)(48.1–53.8)(168–177)(88.2–91.9)

aPercentage values are relative to maximal values during the MIRT. bPercentage values are relative to 5 km·h−1 values (RR); CI = confidence interval. and in relation to LT2 method.