In the study of a 14 year-old male patient who you suspect has a deficiency of muscle glycogen phosphorylase, you indicate a test based in exercising his forearm by squeezing a rubber ball. Compared with the normal person performing the same exercise, this patient would exhibit which of the following?
a) Exercise for a longer time without fatigue
b) increased glucose levels in blood drawn from his forearm
c) decreased lactate levels in blood drawn from his forearm
d) lower levels of glycogen in biopsy specimens from his forearm muscle