energy expenditure during rest,walking, running, and swimming chapter 9 &10
TRANSCRIPT
Energy Expenditure During Rest,Walking, Running,
and SwimmingChapter 9 &10
Gross & Net Energy Expenditure
• Gross expenditure is the total for the entire body mass
• Net is the Gross minus the RMR
Net = Gross - RMR
Factors Affecting Aerobic Performance
• VO2max
• Anaerobic Threshold
• Movement Economy– Muscle Fiber Types– Mechanical Efficiency
Stride Length & Frequency and Speed
• Increasing Running Speed– Increase in stride length– Increase in stride frequency– Increase in both length and frequency
• Running speed increased mainly by lengthening the stride.
• Only at faster speeds does stride frequency become important
Running Economy in Kids
• Kids require 20-30% more energy to run at same speed compared to adults.
• Decreased economy due to:– Increased surface area to mass ratio– Shorter stride lengths– Poor running mechanics
Energy Cost of Swimming
• High ability swimmers have low energy cost of swimming
• Water temp effects energy cost
• Women have 30% lower energy cost
