The aim of the present study was to evaluate the efficacy of
intermittent hypoxic training (IHT) with 95 % of lactate threshold
workload (WRLT) on aerobic capacity and endurance performance
in well-trained cyclists. Twenty male elite cyclists,
randomly divided into a hypoxia (H) group (n=10; age 22 ±
2.7years; VO2max 67.8 ± 2.5 ml·kg-1·min-1; body height (BH)
1.78 ± 0.05 m; body mass (BM) 66.7 ± 5.4kg; fat free mass
(FFM) 59.3 ± 5.1kg; fat content (FAT%) 11.3 ± 2.1%), and a
control (C) group (n = 10; age 23.5 ± 3.5years; VO2max 67.7 ±
2.0 ml·kg-1·min-1; BH 1.79 ± 3.2 m; BM 69.2 ± 5.5 kg; FFM
63.6 ± 4.8 kg; FAT% 7.9 ± 1.94 %) took part in the research
project. The training program used during the experiment was
the same for the both groups. For three weeks, the subjects in H
group performed 3 training sessions per week in normobaric
hypoxia environment (IHT – O2 = 15.2%). During the elemental
core of the IHT session, the intensity was set at 95% WRLT for
30-min in 1st microcycle, 35-min in 2nd microcycle and 40-min
in 3rd microcycle. The same training procedure was provided in
C group, yet the intensity of the main sessions were set at 100%
WRLT in the normoxia environment. The results indicate a significant
(p < 0.05) increase in VO2max,VO2LT, WRmax, WRLT and
change in lactate concentration (ΔLA) during incremental test in
H group. Also a significant (p < 0.05) decrease in time of the
time trial was seen, associated with a significant increase (p <
0.05) in average generated power (Pavg) and average speed (Vavg)
during the time trial. The intermittent hypoxic training (IHT)
applied in this research did not significantly affect the hematological
variables considered: number of erythrocytes (RBC),
hemoglobin concentration (HGB) and haematocrit value (HCT).
Significant blood value increases (p < 0.05) were only observed
in MCV in H group. This data suggests that intermittent hypoxic
training at lactate threshold intensity and medium duration (30-
40min) is an effective training means for improving aerobic
capacity and endurance performance at sea level.

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