pe energy systems and fuels

• aerobic is with oxygen
• anaerobic is without oxygen
• energy is produced when the bond between a phosphate in ATP is broken, forming ADP and pi
• carbohydrates are easier to break down compared to fats because of the low oxygen cost
• glucose floats around in the blood
• glycogen is stored in the kidney and liver
• carbohydrates are better suited for high intensity and endurance activities
• carbohydrates can be broken down regardless of oxygen presence
• glycogen stores can provide up to 2 hours of energy
• phosphocreatine is dominant for about 0-10 seconds
• PC cant be replenished without passive or long time low intensity recovery
• ATP-PC has the fastest rate of production
• anaerobic glycolosis has a fast rate of production
• aerobic energy system has a slow to moderate rate of production
• anaerobic glycolosis produces 2-3 ATP
• the aerobic energy system produces 36-38 ATP
• the byproducts of the aerobic energy system are CO2, heat and water
• the byproduct of anaerobic glycolosis is lactic acid
• anaerobic glycolosis is dominant for 10-60 seconds
• in anaerobic glycolosis accumulation of metabolic byproducts causes fatigue
• in ATP-PC the depletion of fuel causes fatigue
• byproducs of ATP-PC are ADP and pi
• the aerobic energy system is dominant for >60 seconds
• ATP-PC has the smallest yield
• the fuel of ATP-PC is phosphocreatine
• ATP-PC requires passive recovery
• the aerobic energy system requires active recovery/diet
• anaerobic energy system requires active recovery
• Active recovery is using low intensity exercise after fatigue

  • Eg walking, jogging, stretching
• Passive recovery is inactivity after exercise/fatigue

  • Eg sleeping, lying down, sitting
• in continuous sports, the system that contributes the most after initial start is the aerobic energy system
• activities with longer durations are usually more dependent on the aerobic energy system
• Another cause of fatigue in the ATP-PC system, is accumulation of phosphates which reduce power of contractions
• glycogen is the usable version of glucose
• active recovery allows for increased levels of oxygen to be pumped into the body, removing metabolic byproducts. it decreases venous pooling and keeps heart rate elevated to promote blood flow
• increased acidity inhibits muscle contraction
• LIP stands for lactate inflection point
• LIP reflects the last point where lactate entry into and removal from the blood are balanced
• LIP is the maximal intensity at which blood lactate is at a steady state
• LIP is the final point where lactate production balances with lactate removal