Ultraendurance Exercise and Muscle Substrate Utilization

These flashcards cover key concepts related to ultraendurance exercise and muscle substrate utilization, including physiological adaptations and relevant metabolic processes.

Capillaries

Small blood vessels that supply oxygenated blood to tissues and help in nutrient exchange.

Lipoprotein Lipase (LPL)

An enzyme that breaks down fat in the bloodstream to release fatty acids for energy.

VO2max

The maximum rate of oxygen consumption measured during incremental exercise.

PGC-1b

A regulatory gene that plays a key role in energy metabolism and mitochondrial biogenesis.

Plasma Free Fatty Acids (FFAs)

Fats in the blood that provide a significant source of ATP during prolonged exercise.

Neo-capillarization

The process of forming new capillaries, enhancing blood supply and oxygen delivery to tissues.

Muscle Glycogen

Stored form of glucose in muscles, which serves as an energy source during exercise.

Angiogenesis

The development of new blood vessels, crucial for improving oxygen delivery in tissues.

Substrate Utilization

The process by which the body uses different energy sources (carbohydrates, fats) during exercise.

“Hitting the wall”

A condition indicating depletion of muscle glycogen, leading to fatigue and loss of performance.