
We're in the midst of flu season. Just how many news features have you seen on H1N1 virus? How many conversations with friends and neighbors? How many FaceBook updates about the flu?
There are two things you can do to give your immune system a little boost (and these are really good reminders as we head into the holiday season): exercise and relax.
Moderate exercise is linked with a boost to the immune system. The boost is short-term; it may only last for a few hours after exercise.
In the cancer field, we've known for a few years now that exercise can help boost the immune system of people going through chemotherapy. Studies have shown that moderate exercise reduces the number of infections and hospitalizations during treatment, as well as improving the rate of adherence to treatment protocol. And a study by Andrea Mastro, of Penn State University, and colleagues, which was published in Medicine & Science in Sports & Exercise, found that regular moderate exercise helps the immune system of patients undergoing chemo to bounce back faster after chemo is finished.
Well, what's good for cancer patients is also good for everyone else. According to MedlinePlus, which is an online service of the US National Library of Medicine and the National Institutes of Health, it may not be clear exactly how exercise boosts the immune system. But they have a few theories:
*Physical activity may help by flushing bacteria out from the lungs (thus decreasing the chance of a cold, flu, or other airborne illness) and may flush out cancer-causing cells (carcinogens) by increasing output of wastes, such as urine and sweat.
*Exercise sends antibodies and white blood cells (the body's defense cells) through the body at a quicker rate. As these antibodies or white blood cells circulate more rapidly, they could detect illnesses earlier than they might normally. The increased rate of circulating blood may also trigger the release of hormones that "warn" immune cells of intruding bacteria or viruses.
*The temporary rise in body temperature may inhibit bacterial growth, allowing the body to fight the infection more effectively. (This is similar to what happens when the body has a fever.)
*Exercise slows down the release of stress-related hormones. Stress increases the chance of illness, so physical activity could reverse this factor.
(You can read the whole MedlinePlus article that this is from by clicking here. And MedlinePlus is an excellent resource for medical and health information, for those of you who are not familiar with it!)
This may seem counter-intuitive. It might seem like the best option is to rest if you are concerned about your immune system. But it turns out that the best thing might just be to get moving.
The key, as with so many things, is moderation. Very intense and extended exercise actually lowers your immunity. That's why endurance athletes are often quite susceptible to cold and flu after a major endurance race.
Another key factor in immunity is stress. Stress has been shown to lower immunity and make us more susceptible to colds and flu. This is clearly important as we head toward the holidays - which should be fun, but let's face it, are often stressful.
So try to take a few minutes each day to relax - whatever way works for you. Take a quiet bath after the kids have gone to bed, sit quietly in your car for 5 minutes before heading in to work, turn off your phone and computer for just 10 minutes (probably the world will not actually end if you do).
Or go for a walk. That way, you'll relax and get a little moderate exercise.
Julie
