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.
Speed
Lactate
RR
HR
(km·h−1)
%a
(mmol·L−1)
%a
(ms)
%b
(bpm)
%a
HRVTDMAX1
12.1 ± 1.4
73.4 ± 7.3
2.2 ± 0.8
32.7 ± 9.4
379.4 ± 38
54.1 ± 5.2
159 ± 15
83.0 ± 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)
HRVTDMAX2
12.0 ± 1.2
72.9 ± 7.4
2.3 ± 1.2
33.4 ± 15.0
383.6 ± 41
54.6 ± 4.5
158 ± 17
82.2 ± 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)
LT1
11.2 ± 2.1
67.7 ± 7.6
1.7 ± 0.5
24.7 ± 8.5
397.9 ± 38
56.8 ± 5.6
151 ± 14
78.8 ± 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)
LT2
14.1 ± 2.1
85.2 ± 4.9
2.9 ± 0.5
33.5 ± 6.2
356.7 ± 37
51.0 ± 5.9
173 ± 9
90.0 ± 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.