|
Breathing Movements
|
Timing
|
Source |
First seen.
|
8th week after conception |
Roodenburg, p 32 |
| A single, large displacement of the
diaphragm is sometimes similar to a sigh. |
8th week after conception |
Nijhuis/de Vries, p 6 |
| First seen. |
8-9 1/2 weeks after conception |
Nijhuis/de Vries, p 5 |
| Observed in 10 of 12 fetuses studied,
with a median frequence of about 30 breathing movements
per hour. |
9th week after conception |
de Vries (1985), p 106 |
| Observed in 12 of 12 fetuses studied,
with a median frequency of about 60 breathing movements
per hour. |
11th week after conception |
de Vries (1985), p 106 |
| The median breathing movement rate
was 208 per hour in 12 fetuses studied. |
17th week after conception |
de Vries (1985) p 105 |
| The rate of breathing movements was
much higher during the second hour after the mother's
breakfast or lunch than during the third hour. |
20th - 22nd weeks after conception |
de Vries (1987), p 337 |
| Breathing movements occurred most
often right after the mother's meal at noon. |
20th -22nd weeks after conception |
de Vries (1987), p 337 |
| The frequency of breathing movements
changes during the day. In a study of 10 fetuses,
such movements increased from a median of 2% of
the observation time in the morning to 12% in the
afternoon, and then fell to 11% in the evening. |
20th-22nd weeks after conception |
de Vries (1987), p 337 |
| A significant increase in fetal breathing
occurred after giving glucose to the mother. |
22nd week after conception |
Nijhuis/Visser, p 19 |
