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meaning of isotonic contraction/movement

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meaning of isotonic contraction/movement

Postby sarahjay8 » Sun Jan 06, 2008 8:42 am

Question: some definitions of isotonic movement say it means equal tension while others same it’s the muscle shortening as the tension increases: what is it? Can the tension increase over time even know the weight remains the same?
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Postby mith » Sun Jan 06, 2008 3:04 pm

http://en.wikipedia.org/wiki/Isotonic_( ... physiology)

So tension is the reaction force on the muscle fiber. Assume a tension force equal to the weight if you're just holding it. However if you're trying to lift it, you have a tension force equal to the weight plus the acceleration upwards(the force of lifting). Therefore the tension force is higher. Draw a force diagram if this is unclear.
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