Brain Boost

One of the very first articles I wrote for this column was about the benefits of physical exercise for improving memory and preventing disorders such as dementia and Alzheimer’s.  The good news is that nearly four years later, this information is still true.  In fact, some newer research reported in a recent book titled, The Revolutionary New Science of Exercise and the Brain shows that exercise is absolutely vital for memory and proper brain function.

It wasn’t that long ago that the physiology books and med-school instructors taught that loss of brain cells was permanent and irreversible.  Fortunately, this was simply not true.  In the past, I’ve shared the research that emotional stress will shrink the cells of the hippocampus (considered to be the memory center of the brain).  One recent study proved that regular exercise will actually enlarge this memory center by 1-2% per year throughout life!  If you’re wondering how exercise can do all of this, the experts believe it’s because of the increased blood flow to the brain.  They also believe that physical exertion develops new nerves and increase nerve-protecting compounds.  Finally, numerous studies have shown that exercise alters the damaging proteins in the brain that are directly linked to Alzheimer’s.  Researchers also believe that you don’t have to dedicate large amounts of time to get a brain boost – as little as 20 minute workouts can improve long-term memory.  In one study of elementary students, they found that 40 minutes of exercise every day increased IQ by nearly four points on average and the fittest students scored 30% higher on IQ testing than average students.  In adult studies, employees who exercise regularly are about 15% more efficient at their jobs.

In most of these studies, it appears that the type of exercise doesn’t really matter as long as you’re getting appropriate exertion to get the heart pumping and increase blood flow to the brain.  Studies involving weight training, walking, running, and other forms all generated similar results.  The key is to know your target heart rate and get up to 90-100% of your target several times throughout the workout.  The only catch to all of these studies is that if you are looking to improve the brain, the exercise needs to be regular and routine.  In a recent rat study, they found that stopping exercise for just three weeks duration resulted in the nerve cells of the brain to begin to decrease and memory to suffer.  In a second similar study where the rats had only been exercising for a short time (10 weeks) followed by three weeks of inactivity, they determined that the benefits of the exercise were lost and the memory and nerve development was the same as those rats that had always been inactive.  The moral of the story is that exercise needs to be done and it needs to be done regularly!  But if you’re worried about aging gracefully and preventing the emotional hardship that goes with losing memory and dealing with diseases such as Alzheimer’s, this information is still great news and should give you hope and motivation.