Table 2.
Exercise performance and control condition with data summarised as median (interquartile range)
| Performance measure | All participants (n = 32) | Seniors (n = 17) | Young adults (n = 15) |
|---|---|---|---|
| Maximum treadmill test (MTT) | |||
| Relative VO2peak a, mL/min/kg | 38 (31, 51) | 31 (25, 34) | 52 (45, 56) |
| HRmax b, bpm | 172 (160, 192) | 160 (157, 167) | 193 (184, 195) |
| RERa | 1.16 (1.09, 1.21) | 1.1 (1.03, 1.18) | 1.18 (1.14, 1.21) |
| PetCO2 d, mmHg | 34.0 (32.2, 37.6) | 33.2 (31.1 , 34.4) | 36.3 (33.2, 39.0) |
| PaCO2 d, mmHg | 36.1 (34.5, 39.3) | 35.3 (33.5, 36.5) | 38.2 (35.4, 40.6) |
| V’Ed, L/min | 91 (67, 136) | 57 (56, 90) | 129 (84, 149) |
| VTd, L | 2.2 (1.8, 2.8) | 1.6 (1.5, 2.3) | 2.6 (2.0, 3.4) |
| Submaximal 2-km treadmill test (SMTT) | |||
| Relative VO2, mL/min/kg | 26 (19, 30) | 19 (17, 23) | 30 (28, 32) |
| HR, bpm | 127 (122, 143) | 122 (112, 126) | 142 (135, 162) |
| RER | 0.93 (0.88, 1.0) | 0.89 (0.82, 0.94) | 0.97 (0.93, 1.01) |
| PetCO2 d, mmHg | 37.1 (36.1, 40.1) | 36.5 (34.4, 37.0) | 39.0 (36.7, 41.7) |
| PaCO2 d, mmHg | 38.9 (38.0, 41.6) | 38.4 (36.4, 38.8) | 40.6 (38.6, 43.1) |
| V’Ed, L/min | 48 (39, 57) | 33 (30, 39) | 55 (48, 60) |
| VTd, L | 1.7 (1.3, 1.9) | 1.2 (1.1, 1.6) | 1.9 (1.5, 2.2) |
| Control condition (CC) | |||
| Relative VO2 c, mL/min/kg | 3.5 (3, 4) | 3 (2.8, 4) | 3.6 (3.5, 4) |
| HRd, bpm | 56 (54, 65) | 64 (53, 68) | 55 (54, 59) |
| RERc | 0.86 (0.82, 0.9) | 0.83 (0.82, 0.9) | 0.87 (0.85, 0.9) |
| PetCO2 d, mmHg | 36.2 (32.8, 38.0) | 34.3 (31.5, 36.4) | 36.8 (34.7, 39.0) |
| PaCO2 d, mmHg | 38.1 (35.1, 39.7) | 36.4 (33.9, 38.3) | 38.6 ( 36.7, 40.6) |
| V’Ed, L/min | 8 (6, 9) | 7 (6, 8) | 8 (8, 9) |
| VTd, L | 0.5 (0.4, 0.6) | 0.5 (0.4, 0.5) | 0.6 (0.5, 0.7) |
VO 2peak peak oxygen consumption, VO 2 oxygen consumption, HR max maximum heart rate, HR heart rate, bpm beats per minute, RER respiratory exchange ratio, PetCO 2 partial pressure of end-tidal carbon dioxide, PaCO 2 estimated arterial partial pressure of carbon dioxide, V’E minute ventilation/respiratory minute volume, VT tidal volume
aAvailable in 15 (88 %) and 15 (100 %) seniors and young adults, respectively
bAvailable in 17 (100 %) and 14 (93 %) seniors and young adults, respectively
cAvailable in 16 (94 %) and 15 (100 %) seniors and young adults, respectively
dAvailable in 8 (47 %) and 15 (100 %) seniors and young adults, respectively