Table 2.
Twitch control measures
| Characteristic | Men (n = 9) | Women (n = 9) | ||
|---|---|---|---|---|
| Baseline | Post‐PTL | Baseline | Post‐PTL | |
| Twitch characteristic | ||||
| P di,tw (cmH2O) | 38.0 ± 8.2 | 28.9 ± 8.0a | 35.9 ± 7.2 | 27.8 ± 5.6a |
| CT (ms) | 133 ± 4 | 127 ± 5a | 139 ± 12 | 127 ± 5a |
| ½RT (ms) | 83 ± 11 | 73 ± 12a | 82 ± 13 | 74 ± 9a |
| M‐wave characteristic | ||||
| Right hemi‐diaphragm | ||||
| Amplitude (V) | 3.4 ± 0.8 | 3.5 ± 0.1 | 4.1 ± 0.5 | 4.3 ± 0.3 |
| Area (V ms) | 34.4 ± 6.0 | 34.3 ± 6.8 | 36.9 ± 5.2 | 37.4 ± 5.4 |
| Latency (ms) | 4.5 ± 0.5 | 4.6 ± 0.5 | 4.2 ± 0.3 | 4.4 ± 0.3 |
| Duration (ms) | 50.8 ± 1.0 | 49.1 ± 6.1 | 48.4 ± 0.8 | 39.9 ± 3.3 |
| Left hemi‐diaphragm | ||||
| Amplitude (V) | 4.2 ± 0.8 | 4.4 ± 1.4 | 4.2 ± 0.8 | 4.6 ± 1.0 |
| Area (V ms) | 38.9 ± 9.4 | 39.9 ± 8.7 | 37.5 ± 6.4 | 38.2 ± 9.7 |
| Latency (ms) | 5.1 ± 0.3 | 5.1 ± 0.4 | 4.4 ± 0.1 | 4.3 ± 0.2 |
| Duration (ms) | 46.6 ± 8.2 | 47.1 ± 3.8 | 53.4 ± 0.9 | 49.5 ± 3.2 |
Mechanical and electrical responses of the diaphragm to CMS before and immediately after inspiratory PTL to task failure. Results are given as mean ± SD. ½RT, half‐relaxation time; CT, contraction time; P di,tw, transdiaphragmatic twitch pressure.
a
Significantly different from baseline.