Which of the following is true about the Golgi tendon organ (GTO)?
A. Maximum GTO activation occurs before maximum voluntary contraction.
B. GTO inhibition of the agonist alpha motor neuron causes immediate muscle relaxation via the GTO reflex.
C. Effectiveness of the contract-relax technique for stretching is dependent on GTO input.
D. GTO conveys information via a type IIa afferent to the spinal cord.
E. All of the above are true statements.
ANS: B
Rationale: Maximum GTO activation occurs before maximum voluntary contraction. Because maximum GTO activation occurs prior to maximum voluntary contraction, GTO inhibition of the agonist alpha motor neuron cannot cause immediate muscle relaxation; otherwise, muscle could not continue to contract when GTO signals are maximal. Thus there is no GTO reflex. For the same reason, GTO inhibition cannot explain the effectiveness of the contract-relax technique. GTO information is conveyed via type Ib afferents.
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