10. Stimuli, reflex, contraction, regulation of movement

Motor unit

Motor neuron
Axon
Innervated muscle fibres

Myotatic relfex

Due to stretching of a muscle, a protective contraction will be made in the muscle

Inverse myotatic reflex

Stretching position is kept for an optimal time, muscle will have relaxation, with optimal power and speed

Stimulus

provoke transduction and sensation

generate reaction

Components of stimulus

1. Type of stimulus (quality)
2. Intensity
3. Length of stimulus
4. Density of stimulus (duration)
5. Extension of stimulus

Threshold stimulus

the smallest stimulus which results transduction. If the strength of the stimulus is smaller than this, the stimulus is not effective, it does not result any reaction.

Adequate stimulus

the stimulus which stimulates the receptor in the right way, the stimulus edge is the lowest.

Supercompensation

In this time period a training with higher intensity is required as the body already adapted to the previous load.

If training is given during this period, capacity of patient will be better, if not, performance is stagnant.
If training is given before this, performance decreases.
If patient is too tired, that is recovery period

Arndt-Schultz law:

The adequate intensity of stimulus results adaptation only.

Neuromuscular system receptors

In muscles: muscle spindle
In tendons: Golgi tendon organ
In joints: joint kinesthetic receptors

Neuromuscular system stimuli

1. Pressure: increase stability
2. Pulling: facilitate mobility
3. Resistance

Neuromuscular system lack of stimulation

Degeneration and necrosis