Whether you space a college student who wants to be fitter, a netballer who wants a faster an ext powerful throw, a sprinter who desires to win that race or a weightlifter who wants to lift heavier weights, you room trying to make her muscles occupational better.

You are watching: Amount of force a muscle can exert


There are three significant factors that affect how well your muscles perform – strength, power and endurance.

Strength

Muscle strength is additionally a an outcome of the mix of three factors:

Physiological strength, which relies on factors such as muscle size, the cross-sectional area of the muscle and responses come training. Neurological strength, i m sorry looks at just how weak or how solid the signal is the tells the muscle to contract. Mechanical strength, which refers to a muscle’s pulling force and also the way those pressures can be changed using bones and also joints as levers.

When us talk around the stamin or muscles, we room describing the maximum force a muscle can exert. Muscle strength is directly dependant ~ above the size of the cross-sectional area of muscle, so if after a duration of training, you increase your muscle dimension by 50%, you will likewise increase the force the muscle can construct by 50%.

For every 1 square centimetre of overcome sectional area, muscle fibres can exert a maximum pressure of around 30–40 newtons (the weight of a 3–4 kg mass).

Example: Emily can lift 21 kg (210 newtons force) utilizing muscles that have a cross-sectional area the 6 cm2. Usage this formula to occupational out how countless newtons every square centimetre her muscles have the right to pull with:

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Emily’s girlfriend Alisha has actually larger muscles that have actually a cross-sectional area of 8 cm2. Usage this formula to occupational out what load Alisha should be able to lift if she muscle tissue is comparable to Emily’s:

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Power

When muscle contract or large in moving a fill they execute work, and energy is transferred from one type to another. The strength of muscles refers to how quickly the muscles deserve to do this work and also transfer the energy.

Example: A weightlifter lifts 100 kg increase a street of 1.5 m. 100 kg has actually a weight force of 1000 newtons. Usage this formula to calculate the occupational done (energy transferred) by the weightlifter:

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If the weightlifter elevator the 100 kg explosively and takes only 0.5 seconds to do the lift, usage this formula to calculation the strength their muscles produce:

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Where walk the energy come from and where does it go?

The power for muscle contraction originates from glucose transported through the blood and also deposited in muscle tissues. In the weightlifter example, the power has been revolutionized to gravitational potential energy. Also, heat power will be produced in the muscle tissues themselves. This way that the muscles will have actually transferred even an ext energy 보다 the lot calculated above.

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Putting the relationships together

There room three different equations that can be streamlined to do an even more useful equation:

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Because

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the formula can be rewritten: power = pressure × velocity

Sports scientists use this formula to measure the strength profiles of particular sets of muscles by measuring both the force of the muscles and also the rate with i m sorry they room contracting or lengthening. They have uncovered that the best power is produced when the load is much less than the maximum pack on the muscles.