The Ability of a Muscle to Generate Force Over and Over Again
NOTIFICATIONS
Whether you are a pupil who wants to be fitter, a netballer who wants a faster more powerful throw, a sprinter who wants to win that race or a weightlifter who wants to lift heavier weights, you lot are trying to make your muscles work better.
There are three major factors that affect how well your muscles perform – forcefulness, power and endurance.
Strength
Musculus strength is also a upshot of the combination of three factors:
- Physiological strength, which depends on factors such as muscle size, the cross-sectional surface area of the musculus and responses to training.
- Neurological force, which looks at how weak or how strong the point is that tells the musculus to contract.
- Mechanical strength, which refers to a muscle's pulling force and the fashion those forces can be changed using bones and joints as levers.
When we talk about the strength or muscles, nosotros are describing the maximum force a muscle can exert. Muscle strength is directly dependant upon the size of the cantankerous-sectional area of musculus, so if after a catamenia of training, you lot increase your muscle size by 50%, you will also increase the forcefulness the muscle tin develop by 50%.
For every 1 square centimetre of cross sectional area, musculus fibres can exert a maximum force of approximately 30–40 newtons (the weight of a 3–4 kg mass).
Example: Emily tin lift 21 kg (210 newtons strength) using muscles that have a cantankerous-exclusive area of half dozen cm2. Use this formula to work out how many newtons per square centimetre her muscles tin can pull with:
Emily's friend Alisha has larger muscles that have a cross-sectional area of viii cm2. Employ this formula to work out what weight Alisha should exist able to lift if her musculus tissue is similar to Emily'south:
Power
When muscles contract or stretch in moving a load they do piece of work, and energy is transferred from one form to another. The power of muscles refers to how speedily the muscles can do this work and transfer the energy.
Example: A weightlifter lifts 100 kg up a distance of 1.5 thou. 100 kg has a weight force of 1000 newtons. Use this formula to calculate the work done (free energy transferred) by the weightlifter:
If the weightlifter lifts the 100 kg explosively and takes only 0.v seconds to make the lift, use this formula to calculate the power their muscles produce:
Where does the energy come up from and where does it become?
The energy for muscle contraction comes from glucose transported by the blood and deposited in muscle tissues. In the weightlifter example, the free energy has been transformed to gravitational potential free energy. Too, rut energy volition be generated in the muscle tissues themselves. This means that the muscles will have transferred even more than energy than the corporeality calculated to a higher place.
Putting the relationships together
There are three different equations that can be simplified to make an even more useful equation:
Because
the formula tin be rewritten: ability = forcefulness × velocity
Sports scientists apply this formula to measure the ability profiles of detail sets of muscles by measuring both the force of the muscles and the speed with which they are contracting or lengthening. They have plant that the greatest power is produced when the load is much less than the maximum load on the muscles.
Endurance
Muscle endurance refers to how well the muscles can exert and hold maximum forcefulness over and over and over once again.
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Source: https://www.sciencelearn.org.nz/resources/1916-muscle-performance
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