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## How does force and velocity affect muscle contraction?

According to the force-velocity relationship [2,3], the force generated by actively contracting muscle decreases as the shortening velocity increases until the maximal unloaded shortening velocity (Vmax) is reached.

### What factors affect velocity and duration of muscle contraction?

Terms in this set (43)

• The # of muscle fibers stimulated (more more units stimulated = greater contraction)
• The size of muscle fibers stimulated (bulkier muscles = greater tension = greater force)
• Frequency of Stimulus (rapid stimulus = greater contraction)
• Degree of muscle stretch (optimal is 80-120%)

#### What is muscle contraction velocity?

Tetanic contractions, which are long in duration, reach peak force and plateau. The shortening velocity is the speed at which a muscle changes length during a contraction. The force of a muscle contraction declines with increasing velocity.

What is force-velocity?

The force-velocity relationship in muscle relates the speed at which a muscle changes length to the force of this contraction and the resultant power output (force x velocity = power).

What is relationship between force and velocity?

According to Newton’s first law of motion, without a force acting on an object, its velocity does not change. Any change in an object’s velocity is called acceleration, which is the “a” in f = ma. The net force acts on an object to change its velocity and cause acceleration.

## What increases muscle contraction?

As the stimulus frequency is increased, the force is increased until the maximum is reached, at which point it begins to decrease. An increase in the level of circulating epinephrine and norepinephrine from the sympathetic nervous system also increases the force of contraction.

### What affects the strength of muscle contraction?

Muscle strength is also a result of the combination of three factors: Physiological strength, which depends on factors such as muscle size, the cross-sectional area of the muscle and responses to training. Neurological strength, which looks at how weak or how strong the signal is that tells the muscle to contract.

#### How do you calculate force and velocity?

Net force = force minus body weight. Acceleration = net force ÷ body mass (body weight ÷ the acceleration of gravity [9.81 m/s/s]) Velocity = acceleration × time. Displacement = velocity × time.