Question

Standing in full upright position a patient goes into a squatting motion, which of the following are True or false? Explain your answers (Assume that gravity is not considered)

a) The quadricep muscles are eccentrically contracting.

b) The rectus femoris is in a maximally elongated position at the end of this motion.

c) The semitendinosus and semimembranosus are maximally shortened at the beginning of this motion.

d) The biceps femoris—short head is strongly activated throughout this motion.

Answer 1

a) The quadricep muscles are eccentrically contracting

Answer: False

Explanation :Eccentric Contractions

An eccentric contraction is a type of muscle contraction when the length of the muscle elongates, or lengthens while undergoing tension.

In going standing upright position, quadricep muscles are elongated.

b) The rectus femoris is in a maximally elongated position at the end of this motion

Answer: False

Explanation :The rectus femoris, sartorius, and iliopsoas are the flexors of the thigh at the hip. The rectus femoris is a weaker hip flexor when the knee is extended because it is already shortened and thus suffers from active insufficiency

c) The semitendinosus and semimembranosus are maximally shortened at the beginning of this motion.

Answer:. True

Explanation : Semimembranous and semitendinous muscles are the hamstring muscles. These are the knee flexors. In squatting position knee are flexed and so is these muscles.

d) The biceps femoris—short head is strongly activated throughout this motion.

Answer : False

Answer : Bicep femoris is the flexor of knee joint.