Table 1 Data are expressed as the mean (SE).
Variables |
BpVL |
BpGL |
LT |
GET |
Peak |
n |
31 |
31 |
24 |
31 |
31 |
Time (s) |
797 (25)*† ‡ |
895 (23) |
899 (27)‡ |
933 (26) |
1256 (32) |
WR (W) |
137 (6)*† ‡ |
153 (6) |
154 (7)‡ |
160 (6) |
213 (7) |
VE (mL·min-1) |
60.2 (3.1)*† ‡ |
70.8 (3.8) |
68.8 (4.4) |
72.0 (3.7) |
134.3 (7.5) |
VO2 (L·min-1) |
2.2 (0.1)*† ‡ |
2.5 (0.1) |
2.5 (0.2)‡ |
2.6 (0.1) |
3.9 (0.2) |
VO2 (mL·min-1·kg-1) |
30.6 (1.3)*† ‡ |
34.7 (1.5) |
34.6 (1.7)‡ |
36.5 (1.5) |
53.4 (2.2) |
VCO2 (L·min-1) |
2.1 (0.1)*† ‡ |
2.5 (0.1) |
2.5 (0.2) |
2.6 (0.1) |
4.3 (0.2) |
RER |
0.96 (0.02)*† ‡ |
0.99 (0.02) |
0.98 (0.02) |
0.98 (0.02) |
1.13 (0.02) |
HR (bpm) |
144 (2)*† ‡ |
154 (3) |
152 (2)‡ |
157 (2) |
184 (2) |
[La]b (mM) |
3.7 (0.3)*† ‡ |
4.2 (0.3) |
3.6 (0.2)‡ |
4.5 (0.3) |
8.8 (0. 5) |
%VO2peak (%) |
57.7 (1.4)*‡ |
65.7 (1.7) |
64.5 (1.6)‡ |
68.7 (1.3) |
-- |
n, sample size; WR, work rate; V, ventilation; VO, oxygen uptake; VCO, carbon dioxide output; RER, respiratory exchange ratio; HR, heart rate; [La], blood lactate concen tration; % VO, percentage of VO; BpVL and BpGL, the breakpoints (Bp) of the muscle oxygenation index in the (BpVL) and (BpGL); LT, lactate threshold; GET, gas exchange threshold; Peak, peak values during the incremental exercise.* significantly different from BpGL (p < 0.05);† significantly different from LT ( < 0.05);‡ significantly different from GET (p < 0.05). All thresholds (BpVL, BpGL, LT and GET) were significantly different from the Peak values (p < 0.05).