Clean Run - February 2013 - 14

If you
build it...
they can
run!

You can see in the chart that within the first 2 minutes of exercise, the creatine
phosphate that is stored in the muscles is completely used up and glucose (via
glycolysis and free glucose) is made available to the cells for up to about 7 minutes. As a result of anaerobic glycolysis, lactic acid and other by-products will form.
Meanwhile, the carbohydrate demand increases in the first few minutes and then
plateaus to about 90 minutes when it then declines. This is when fat metabolism is
the primary source of fuel.

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There needs to be an abundance of simple sugars and stored phoshagens available
for energy production in the cells during the first 4 minutes of intense activity. The
amount of glycogen (fuel) stored in the muscles and the liver is very important for
the sprinter in relation to stamina. An abundance will allow the body to perform
well and not fatigue. Agility dogs do not rely on the anaerobic glycolysis pathway
as much as Greyhound racers do; however, it is still a significant pathway. Carbohydrate oxidation (aerobic) is needed for acceleration and higher energy rates, but
only while glucose stores (glycogen) last. Fat oxidation (aerobic) to some extent can
provide energy for agility dogs, especially when there are multiple runs in one day.
So a moderate amount of fat should be fed as well.

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may lead to less phosphagens. The graph provided will help explain the source of
fuel for the cells at different stages of exercise. The left vertical axis of the graph is
the maximal aerobic capacity (human study) and the horizontal axis is the length
of time of the activity.

During anaerobic exercise and muscle contraction the intramuscular lactic acid
and carbon dioxide build up and causes an increase in hydrogen ions which lowers (acidifies) the pH in the muscle cells. Also, when ATP is hydrolyzed and used up
at fast rates during anaerobic metabolism, lots of hydrogen ions are created and
the pH is lowered. This will create a state of acidosis that may contribute to acute
muscular discomfort. It has been suggested that manipulating the diet to change
the pH of the body to a more basic level (higher pH) would help neutralize post
exercise acidosis and muscle tie-up as well as delayed onset muscle soreness. The
theory is that by nutritionally controlling the pH of the body the athlete would
recover more quickly and avoid fatigue as well. Examples of alkalinizing foods
are most vegetables (except for beans), most fruits (except for blueberries, cranberries, currants, plums), almonds, tofu, whey protein powder, herbs, blackstrap
molasses, probiotic cultures, calcium, magnesium, potassium, and sodium.
Clean Run | February 13

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Clean Run - February 2013

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