Sailer, Photo Run
Often, we come
across various new training methods and ideas. Some are
very straightforward, while others seem so far fetched
Many of them are based on studies being done in labs and
elsewhere by scientists around the world.
This column will look at research which relates to running.
This is meant only to report on the studies, not to offer any advise or new ideas.
Most of us are aware that almost anything can be proved or
disproved by science. Still, it is interesting to note what is going on in the scientific
arena and how it relates to us, the women runners.
And Muscle Glycogen Accumulation In Humans
In a study out of Washington University School of Medicine,
an investigation was undertaken to determine if endurance training increased the ability
of human skeletal muscle to accumulate glycogen after exercise. This is of course, the
basis behind the carbohydrate loading of endurance athletes.
The process involves a final exercise bout, depleting the
body of muscle glycogen, then spending the three days prior to the event replacing this
glycogen. This particular study dealt more with the effect of training on glycogen than on
the loading itself.
These subjects exercised 6 days a week for 10 weeks. Three
days would focus on high intensity stationary cycling, and three days would involve
Prior to training, muscle glycogen concentration was
measured after an intense exercise bout which left the muscles depleted of glycogen. After
the 10 weeks, the glycogen concentration was again measured after an intense exercise
bout. Measurements were taken 15 minutes, 6 hours and 48 hours following the intense
This study found that endurance training increased by two
times the amount of glycogen remaining in the skeletal muscles following the exercise
bout. In addition, this increased glycogen remained higher through all three measurements.
Glycogen synthase activity (the result of the breakdown of
glycogen) was not significantly different after endurance training, which would lead to
the conclusion that endurance training enhances the capacity of the human skeletal muscle
to accumulate glycogen following depletion exercise.
So the carbohydrate loading this is a good idea.
and Injury Prevention
Price of Success