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Lecture 1

Kinesiology 2230A/B Lecture Notes - Lecture 1: Vo2 Max, Cytochrome C, Citric Acid Cycle

Course Code
Kinesiology 2230A/B
Glen Belfry

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Adaptation Lecture 1
Time Motion Analysis
Determines how much time people spend at different intensities
Amount of recovery time in the sport dictates the possible intensities that people can perform at
o More time between efforts means greater ability to perform at a high level
Anaerobic Concentrations
At 60 seconds, 50:50
After 60 seconds, it becomes more aerobic
Any maximal effort under 60 seconds will become anaerobic
Aerobic Metabolism
1. Increase capacity - volume, duration, intensity
2. Increase fuel storage
3. Sparing of CHO - fatigue if deplete glycogen stores
Increased Capacity
Increase in mitochondrial size and number will give more enzyme activity
o Results in increased aerobic capacity
Capacity increases over time and gradually levels off
Duration and intensity are also important factors
Kreb's Enzymes
Gastroc enzyme activity in untrained, moderately trained, and highly trained
Enzyme activity increases with more training
How Much is Enough?
At elite levels, some athletes spend 20-30 hours per week training aerobically
Study looked at increase in volume over time, % change in VO2 max, maximal O2 consumption
o As VO2 max and maximal O2 consumption increase, aerobic capacity increases
o With a linear increase in volume, VO2 max from months 3-7 didn't change
o More linear increase in SDH despite O2 consumption plateau
o Metabolic rate of kreb's cycle continued to increase and improved lactate threshold
Exercise Bout Duration
Aerobic capacity increases over time and gradually levels off
Duration and intensity of exercise are also important influences
Mitochondrial content increases with increased intensities but duration to sustain a particular
work rate decreases
Cytochrome C
More Cytochrome C results in more electrons that can be processed in the ETC
Increased intensity = increased Cytochrome C = more ATP from ETC
Greatest increase with high intensity
80-90% Max HR Training
15 minutes - 8.5% VO2 max increase
30 minutes - 16.1% VO2 max increase
45 minutes - 16.8% VO2 max increase
Effects of Intensity
Have to work hard to see increase in mitochondrial content, but will quickly go up
ST fibres will plateau over time
Intensity is important for trying to change VO2 max
Different Fibre Types with Intensity and Cytochrome C
Type I with increasing intensity after threshold, start to lose adaptation
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