Exercise & Oxygen Debt

• Exercise


  Requires increased muscular contraction, which requires more energy from respiration
• Increased oxygen demand from exercise

  1. Increased breathing rate and volume

  2. Increased heart rate to pump oxygen around body faster
• Insufficient oxygen supply during intense exercise

  Cells switch to anaerobic respiration
• Anaerobic respiration


  Less efficient than aerobic respiration, produces lactic acid
• Lactic acid buildup from anaerobic respiration


  Causes a burning sensation in muscles
• Removing lactic acid after exercise

  1. Lactic acid carried to liver

  2. Reacted with oxygen to convert back to glucose
• Oxygen debt


  Extra oxygen needed to remove lactic acid after exercise
• Measuring effects of exercise

  1. Measure breathing rate

  2. Measure heart rate
• Breathing rate is measured by counting chest rises and falls per minute
• Heart rate is measured by feeling pulse on wrist or neck
• Questions will likely involve measuring changes before and after exercise