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The Human body and Strenuous Activities (Short Bouts of Activity (ATP…
The Human body and Strenuous Activities
Long Strain of Activity
Activities that last longer than 30 seconds
Body begins to break down carbohydrates and glucose = process called glycolysis
For every glucose molecule that goes through glycolysis, two ATP molecules are produced
Also produces Pyruvic acid
Body breaks down Pyruvic acid into 36 to 38 molecules of ATP
Can Fuel out muscles for 3 min to 4 hrs
During high intensity exercises
Body doesn't inhale sufficient amount of O2 to generate all of the ATP to keep us going
Pyruvic acid is converted into Lactic Acid
for years lactic acid was assumed bad for your muscles
Amino Acids
Not meant for major fuel source
may contribute about 3% to 6% of the energy needed
Most Americans eat more than enough protein (amino acids) to support tissue recovery
If we do not eat enough carbohydrates our body will draw on protein store for energy
Short Bouts of Activity
ATP (adenosine triphosphate)
can only keep muscles active for 1-3 seconds
More energy needed? Creatine Phosphate (CP) is broken down, this is also stored in out muscles.
4 to 6 times as much CP than ATP
not enough for long term activities
carbohydrates and fat are broken down of the energy nutrients for energy to last longer
Fuel Sources for the body
Fat = fuel source for the body = triglyceride molecule
triglyceride molecule = primary storage form of fat in our cells
composed of a glycerol backbone attached to three fatty acids molecules
two major advantages using fat as fuel
fat is an abundant energy source
Fat provides 9 kcal of energy per gram whereas carbohydrates provide only 4 kcal per gram.
fat supplies more than twice as much energy per gram as carbohydrate
disadvantage: the breakdown process is slow
should be used as a fuel source for lower intensity and longer duration activities
When training eat carbohydrates