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Lecture 4

BPK 143 Lecture Notes - Lecture 4: Hyperplasia, Hypertrophy

Biomedical Physio & Kines
Course Code
BPK 143
Tony Leyland

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Week 4
Power = Force x velocity
-Maximum power occurs at about ⅓ maximal velocity of shortening and about ⅓ maximum
concentric force
Optimal Power
-Athletes must find as high a level of power output as possible that can be sustained for the
duration of their event
Power to Weight Ratio
-In many sports it is not just about how much power you output, it is also about how much you
-Tour de France, it is a matter of relative power. The amount of power/weight can sustainably
generate is what will win. Measured in watts per kg of body weight
-6.7w/kg is more or less the magic number
You can’t have it all in extremes
-If you’re a weightlifter and weigh a lot, you can’t become a very good endurance runner
-You can’t reach your genetic potential in everything
Torque, Force, angle
Variable Resistance (Leverage (force X distance) )
Advantages of machines
-safety is easier
-Less skill required
-program deisgn flexibility is higher
-pattern of resistance can also be designed into a machine
Advantages of free weights
-uses more body structure (performed standing)
-more stability
-more skill required
-more natural coordination, can help with real life activities
Slow Twitch fibres:
-small diameter
-slow contraction
-low strength contraction
-used during endurance events
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