After my broken arm healed and my cast was removed, i found that my muscles had atrophied and it was difficult to use them in the same way i had before my injury. this statement refers to which of the sport training principles? specificity progression overload reversibility

Option D, Reversibility

Explanation:

Reversibility training in any physical training process is a way by means of which the lost sensitivity or functionality of any sense organ is regained through exercise.

Basically in this process of training, an athlete tries to regain the  lost effect of training after they has stopped exercising.

In this case the lost effect of removed cast and broken arm is tried to be  recovered through physical training known as Reversibility

Hence, option D is correct

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.