Does mental distraction affect patellar reflex?

Does mental distraction affect patellar reflex?

Results. We found that the addition of mental activity had no influence on the patellar tendon reflex parameters measured, while the JM provided facilitation (increased reflex amplitude, decreased total reflex time).

What is the normal response of the patellar reflex?

The patellar reflex occurs when an abrupt change arises in muscle length; in this case, it is produced by the tendon stretching, which is caused when the hammer stroke is applied [3, 4]. The normal response must be a sudden leg extension.

What is the purpose of patellar reflex?

A stretch reflex is a type of muscle reflex, which protects muscle against increases in length that can tear and damage muscle fibers. The primary purpose of the patellar reflex – the stretch reflex of the quadriceps femoris muscle – is to prevent excessive stretching of the quadriceps.

How does fatigue influence the patellar reflex?

Fatigue on patellar influences the rapidity and effectiveness of reflex, it decreases the reflex response.

Is the patellar reflex somatic or autonomic?

Autonomic Reflexes
Autonomic Reflexes Activity 1- Patellar reflex The patellar tendon reflex or knee-jerk reflex is a monosynaptic stretch reflex that assesses the nervous tissue between (and including) the L2 and L4 segments. It can be done by tapping the patellar ligament (just below the knee) with a reflex hammer.

What are the major events that occur in the patellar reflex?

what is the response observe in a patellar knee jerk? effector muscle in the patellar knee jerk? The quadriceps femoris is stretched, stimulating stretch receptors (muscle spindles) within the muscle. As a result, impulses pass along sensory neurons into the spinal cord and synapse with a motor neuron.

What type of reflex is patellar knee-jerk reflex?

The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord.

What does no patellar reflex mean?

Clinical Significance An absent or diminished patellar tendon reflex may be due to PNS pathology affecting either the afferent sensory neurons or the efferent motor neurons. If the reflex is absent or diminished combined with sensory loss, the lesion is likely in the afferent sensory nerves.

Does exercise affect patellar reflex?

However, patellar reflex latency was significantly shorter in the weight lifters than in the distance runners. Following knee extensor exercise consisting of three bouts of a 50% MVC holding-time task, the power group manifested a marked lengthening in total reflex time and reflex motor time.

What type of reflex is patellar reflex?

stretch reflex
The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord.

Is the patellar reflex innate or conditioned?

Just as Pavlov’s discovery of the conditioned salivary reflex was accidental, so was Twitmeyer’s. His dissertation was actually concerned with variability in the patellar reflex — which, as an innate reflex, was supposed to be invariant.

What causes absent knee-jerk reflex?

An absent or diminished patellar tendon reflex may be due to PNS pathology affecting either the afferent sensory neurons or the efferent motor neurons. If the reflex is absent or diminished combined with sensory loss, the lesion is likely in the afferent sensory nerves.

What happens during knee jerk reflex?

The sharp tap on the tendon slightly stretches the quadriceps, the complex of muscles at the front of the upper leg. In reaction these muscles contract, and the contraction tends to straighten the leg in a kicking motion.

What nerve is tested in the patellar reflex?

The patellar tendon reflex tests the function of the femoral nerve and spinal cord segments L2-L4.

Is patellar reflex autonomic?

Autonomic Reflexes Activity 1- Patellar reflex The patellar tendon reflex or knee-jerk reflex is a monosynaptic stretch reflex that assesses the nervous tissue between (and including) the L2 and L4 segments. It can be done by tapping the patellar ligament (just below the knee) with a reflex hammer.