Hello,
I am glad that you asked this question because this problem is quite common for a couple of reasons (and the answers you have received so far are great). This is most certainly caused by a drop in blood glucose so you need to focus on keeping your blood glucose stable during/after exercise:
- due to the caloric restrictive aspects of weight loss surgery, nutrient timing becomes extremely important if you are going to be competing in an athletic event.
- many individuals stay away from carbohydrates post op and rather focus on protein.....this will dramatically decrease exercise/sport performance as carbohydrate or muscular stores of glycogen are the bodies preferred source of energy. This is not to say that protein shouldn't remain a focus, but complex carbohydrates becomes more vital.
- depending on what surgical procedure you have, may determine how much or what type of feeding you can use
during extended exercise. If you have had Lap-Band or Duodenal Switch, consuming gatorade, the gels or other high glycemic index carbohydrate food replacements is ok. If you have had RNY, dumping syndrome may limit what you can consume.
When going on long runs I would certainly keep in mind what the others have told you so far....stay hydrated, eat plenty of complex carbohydrates the day before and eat a complex carbohydrate rich meal a couple of hours prior to running. I would also ad an additional, smaller meal (also ri*****omplex carbohydrates) about 60 minutes prior to your run as long as it does not upset your stomach.
Any fairly intense exercise session that lasts longer than 60 minutes, will require carbohydrate feeding to maintain exercise intensity. Muscle glycogen becomes depleted and your body, will become more reliant on body fat and protein to meet its energy needs (this is bad). You want your body to use carbohydrate because energy from carbohydrate can be generated far more rapidly. This is where you surgical type may limit and/or make things more complicated (You have not told us your surgical type so maybe you can back to me on that one). If you have had RNY and you experience dumping syndrome fairly easily it may take a little experimentation. Perhaps you dump on Gatorade but some of the gels you can tolerate. I would suggest experimenting prior to running and not during
.
Post exercise feeding is also important. Again due to the caloric restrictive aspects of WLS in combination with frequent intense or long durations of exercise you need to eat on a regular basis period. One of your biggest problems will actually be getting enough calories to meet your energy demands. Replenishing glycogen after exercise is crucial. If you do not restore muscle glycogen (and liver) adequately prior to your next exercise session, your performance will suffer.
Hope this helps and let me know if you need an