Energy Flashcards
Why is local glycogen storage more important for a muscle’s performance than the whole-body storage level?
Muscle tissue lacks the enzyme glucose-6-phospatase, which serves to convert the phosphorylated glucose to free glucose. Phosphorylated glucose cannot re-enter into the bloodstream. Therefore it can only be used to fuel the local muscle tissue. Local glycogen stores are the primary and immediate fuel source for anaerobic glycolysis. Whole-body glycogen store capacity doesn’t matter in the context of muscle activation, since muscles cannot tap into other muscles glycogen stores. Liver glycogen can be mobilized to other body parts, but it’s only ~80g out of ~500g typical storage for a strength trainee.
Explain how poor carbohydrate tolerance can hinder fat loss on a high carbohydrate diet.
1) It can cause a person to become lethargic after eating carbs causing poor appetite control 2) and reduce energy energy expenditure (TEF and/or NEAT)
3) Lower well-being and thereby diet compliance.
4) Possibly impaired nutrient partitioning.
Explain why overfeeding on carbohydrates is just as fattening as overfeeding on fats.
because once glycogen storage is full, the excess energy is stored as fat.
Feedback: While high-carbohydrate overfeeding may initially primarily store more glycogen, glycogen stores will be satiated within a matter of days, and any energy spent on glycogen storage frees up future energy to store as fat, that would otherwise be spent on glycogen resynthesis. So over time, fat gain is almost exclusively determined by the total energy surplus, not the ratio of carbs to fats in the diet.
What is the primary fuel substrate for a 30-second bicycle sprint?
Glucose. Since the involved muscles would rely primarily on the ATP-CP cycle for the first ~10 seconds, after that, anaerobic glycolysis would start to principally fuel the effort.
Explain why it doesn’t matter for your physique whether a carb is simple or complex?
Because your gut breaks down all polysaccharides to glucose before they reach your bloodstream. Simple carbs and oligosaccharides are all broken down to glucose or fructose. So different foods provide a different package of carbohydrates, but ultimately, they contain the same 1-2 types of fuel for your body.
Causes of bloating
Stress, sleep deprivation, food intolerance, & improper fiber intake. Also estrogen hormone changes throughout the menstrual cycle that govern water retention.
Measurement location in women
Especially at lower body fat percentages, it is not uncommon for women to lose very little fat, if any, from their waist in the short term. Most of the fat will be coming off their lower body. In this scenario, it’s a good idea to track hip or thigh circumference in
addition to waist circumference.
