Soli,
I know this is late, but I wanted to address this post. In the level II manual, it is mentioned in connection with working on someone else, and I did some research, and found some related information that harmonizes with Master Lin's information in level II. Funny,,,,I knew of this qigong master who learned from a master who was a women, and I thought this might be addressed more specifically in his material , and it was...
In general, practicing qigong can help your circulation during a period, and so ease headaches, stomach cramps and any emotional problems. However, for some women who have heavy periods, you should change your meditation from concentrating on the lower dan tien, to the middle dan tien. This is because the lower dan tien is related to the womb area, and concentration there may overstimulate the area during a period, making it heavier. The specific accupuncture point mentioned in reference to concentration on the middle dan tien is the Shanzhong point(midpoint, between the two nipples), which is related to the heart and lungs. This information , as I said, harmonizes with Master Lin's suggestions in the level II manual concerning pregnancy and menstrual period in regards to working on someone else:
-never pull the energy down the body. Instead, go to the sides...
-Instead of giving energy to the lower dan tien, give energy to the middle dan tien, which is the heart center.
-Have your friend focus in her heart during the healing session, if possible..
As you can see, for the most part, you can practice as usual,and lessen the side effects, but, take this info into consideration, as to how it applies to you, and different active exercises and meditation techniques. I wouldn't go to the extreme of staying completely away from the lower dan tien, say in an exercise like small universe, where you move through that center. I would interpret it as more elongated focus/time on the lower dan tien, maybe not being desirable, and of course, the literal suggestions by Master Lin regarding level II healing techniques. I hope this gets to you!
love,
gallen
