The type of energy used depends on what
- intensit
- duration
- fitness status
- nutrional status
What is the primary function of anaerobic energy transfer during exercise?
- it provides energy for fast movements during increasing resistance to movement
- short durations
- during 200-400m race
What’s the key difference between aerobic energy transfer with lactate and without lactate?
with lactate:
- intense or intermediate duration exercise (5-10 minutes
ex. swimming, basketball, middle distance running
without lactate:
- longer duration (more than 10-15 minutes) with a steady energy supply
ex. jogging, backpaking, marathon
List two main and 1 minor source of enegry for ATP synthesis
Main Sources of Energy
Liver and muscle glycogen is a major energy source. Glycogen is the storage form of carbohydrates in the body. The diagram on the slide shows the liver and a muscle, indicating that glycogen is stored in both locations and can be broken down to provide glucose for energy.
Triacylglycerols (TAG), which are a type of fat, are the other main energy source. They are found in adipose tissue (body fat) and within the muscle itself.
Minor Source of Energy
Amino acids from skeletal muscle are a minor source of energy. They can be used as fuel, but this typically occurs when the body’s main energy sources (carbohydrates and fats) are depleted. The image of alanine on the slide represents an amino acid that can donate its carbon skeleton to be used for energy.
What is your bodies preferred energy source at rest
- lipids
What is your bodies preffered energy source during high intensity sprint
- CHOs (glucose + glycogen)
What is the effect of consuming high-glycemic index foods before or during exercise?
- blunted FFA oxidation in skeletal muscle
- blunted FFA liberation from adipose tissue
Explain how carbohydrate availability, particularly from sources like sports drinks, can affect exercise performance.
ingesting glucose beverages helps delay depletion of muscle glycogen during excercise
What is the prefferd fuel for intense aerobic excercise
CHOs
How does hormonal influence effect the release glucose
- epinephrine and NE, and glucagon increase with intense exercise while insulin decreases
- this change stimulation glycogen phosphorylase for glycogenolysis which breaks down to glucose in muscle and liver
What is the main contributer in early activity
muscle glycogen later blood glucose from liver increases contribution
Describe liver glycogen content after 1h vs 2h
- depleted 55% in 1 hour
- almost 100% in 2 hours
