In light of Steph's question about studies on distance running in pregnancy, I thought I'd make a list of all the studies that came to mind, which I have read over the past few years, that deal with health and safety of running/exercising in pregnancy. For those of you who have been reading for years, this isn't the first time I've mentioned most them.
Bear in mind that this list is no substitute for good clinical judgement and there ARE contraindications to running while pregnancy (but great debate exists around what exactly those contraindications should be).
Clapp 1989 - women running 19-88 km/week or aerobics three or more times a week.
Spontaneous abortion (miscarriage)
aerobic dancers: 16.5%
Hall & Kauffman 1987
Strength training and c-section rate
low intensity: 24%
medium intensity: 19%
high intensity: 6%
(I know. It's not running - but wow - ALMOST as good as running [see below]!)
running 14-68 km/week and/or aerobics 3-11 times per week (case control study; controls were equal in education and age, etc)
length of labor
controls: 390 minutes
runners: 260 minutes
meconium (sign of baby distress) when water breaks
abnormal heart rhythm in baby during labor
Long-term baby outcomes (baby now 5 years old; same running women and controls)
-children of runners significantly leaner and more active
-children of runners significantly "much" higher IQ and oral language skills
Sørensen et al 2003
controls - control rate
physically active: 35% relative risk reduction
physically active more than 6 hours per week: 69% relative risk reduction
Juhl 2007 Danish National birth cohort:
20% reduced chance of preterm birth among women who exercise > 5 hours per week
This last study is the one I am applying to get permission to analyze specifically for women who run more than 5 hours a week.
P.S. Steph - I'm not trying to give you specific advice, but you mentioned wanting to see studies, so I hope this might be some of what you're looking for.
In other news, The Lorax has chickenpox. He seems completely unbothered by it. I don't think they itch him at all. Happily I've had it, otherwise I'd have yet another pregnancy worry to dwell on.
Speaking of which, I gave myself an ultrasound in the ophthalmology dept. today, just to make sure my pregnancy was intrauterine. The tiny eye probe went just deep enough so I could identify the anterior side of the uterus. I found what might be the gestational sac on the left, but it might have been bowel. There is a reason people go to ultrasonographers, I guess. In Denmark, you have to wait until week 12 to get an ultrasound, so I've got a while - but I'll probably know if it's ectopic before then anyway.