A Physical Therapist Is Designing a Lower Extremity Strengthening Exercise

A physical therapist is designing a lower extremity strengthening exercise for a 72 year-old patient with idiopathic Parkinson disease (PD) .Which of the following exercise prescriptions would be optimal to improve muscle power needed for functional mobility tasks? Note: 1 RM = 1 repetition max

A) Straight leg raises performed in supine with 70% 1 RM load,hold leg lift for 4 seconds than lower;perform 10 repetitions × 2 sets.
B) Short arc quadriceps exercise performed in sitting with 50% 1 RM load;perform 20 repetitions × 3 sets.
C) Small range partial squats performed in standing with back of chair for support,slowly lower to count of 5 then return to standing,repetitions to fatigue × 1 set.
D) Sit-to-stand exercise from seated in standard chair without armrests,generate stand as quickly as possible followed by slow lower to chair;12 repetitions × 2 sets.