If youre worried about high cholesterol levels
and keeping heart-healthy as you get older, push aside
cholesterol-lowering medications. A new study says cholesterol
might actually provide a benefit.
Researchers at Texas A&M University have discovered
that lower cholesterol levels can actually reduce muscle
gain with exercising. Lead investigator Steven Riechman,
assistant professor of health and kinesiology, and Simon
Sheather, head of the Department of Statistics, along
with colleagues from The Johns Hopkins Weight Management
Center and the Northern Ontario School of Medicine, have
recently had their findings published in the Journal of
Gerontology.
Bottom line: Before you have that second helping of oatmeal,
its very possible that cholesterol may not be the
mean Mr. Evil thing we tend to believe it is.
We were not expecting to get these kind of results,
Riechman explains.
We need further research in this area, but what
we found could really make us look differently at cholesterol,
especially as it relates to a vigorous workout.
The team studied 55 men and women, ages 60-69, who were
healthy non-smokers and were able to perform exercise
testing and training.
Three days a week for 12 weeks, participants performed
several exercises, including stretching, stationary bike
riding and vigorous weight lifting. Those who had to miss
one or more sessions all conducted make-up sessions so
that by the studys end, the entire group had engaged
in uniform activities. Also, all participants consumed
similar meals.
At the conclusion of the study, the researchers found
that there was a significant association of dietary cholesterol
and change in strength. In general, those with higher
cholesterol intake also had the highest muscle strength
gain.
Cholesterol circulating in the blood also appeared to
have contributed to greater muscle gain in the participants,
Riechman said.
One possible explanation is through cholesterols
important role in the inflammation process, he noted.
As you exercise, your muscles can become sore because
they are rebuilding muscle mass. More cholesterol may
result in a more robust inflammatory response. We know
that inflammation in some areas, such as near the heart,
is not good, but for building muscles it may be beneficial,
and cholesterol appears to aid in this process.
Riechman said that subjects who were taking cholesterol-lowering
drugs while participating in the study showed lower muscle
gain totals than those who were not.
Needless to say, these findings caught us totally
off guard, he explains.
From here, we need to look at a number of questions,
such as what exactly happens to cholesterol while you
are exercising? What role does protein intake have in
all of this? What we really need to do is to trace cholesterol
the moment it goes into the muscles.
Combined with exercise, cholesterol appears to play a
role in contributing to muscle gain, Riechman says. The
key here is working out it doesnt mean sitting
in front of a television all day thinking you dont
have to worry about cholesterol levels.
Our findings show that the restricting of cholesterol
while in the process of exercising appears
to affect building muscle mass in a negative manner. If
its true, as our findings suggest, that cholesterol
may play a key role in muscle repair, we need to know
exactly how that happens. And because cholesterol is negatively
associated with cardiovascular health, we need further
study in this area. It shows that there is still a lot
about cholesterol that we dont know.