Table 4.
Changes in ventilatory and cardiovascular variables from baseline during yaw and chair rotation in the young and older subjects
| Variable | Yaw | Chair | ||||
|---|---|---|---|---|---|---|
| Young | Older | P value | Young | Older | P value | |
| (n = 14) | (n = 12) | (n = 14) | (n = 12) | |||
| ▵Inspiratory time (ms) | −220 ± 74* | −125 ± 71 | 0.382 | −40 ± 62 | −22 ± 42 | 0.820 |
| ▵Expiratory time (ms) | −410 ± 76* | −252 ± 113* | 0.253 | −211 ± 143 | −100 ± 50 | 0.496 |
| ▵Ventilation (1 min−1) | 1.6 ± 0.6* | 0.4 ± 0.5 | 0.122 | 1.1 ± 0.4* | 0.4 ± 0.4 | 0.241 |
| ▵A Breathing frequency (breaths min−1) | 3 ± 0* | 2 ± 1* | 0.180 | 1 ± 1 | 2 ± 0* | 0.668 |
| ▵Tidal volume (ml) | 11 ± 30 | −37 ± 28 | 0.247 | 33 ± 15* | −30 ± 23 | 0.028 |
| ▵HR (beats min−1) | 1 ± 1 | −3 ± 1* | 0.354 | 1 ± 1 | 0 ± 0† | 0.322 |
| ▵MAP (mmHg) | −2 ± 1* | −2 ± 1 | 0.739 | 1 ± 1† | 1 ± 1 | 0.634 |
Values are mean ±s.e.m.P value represents the interaction term from the ANOVA (age x intervention).
*
P < 0.05 for change from baseline.
†
P < 0.05 significant difference in interaction term from ANOVA between yaw and chair rotation.