Increased capacity of the phosphagen system with speed (anaerobic power) training results from (Check all that apply)
More myoglobin content of muscle
Greater mitochondrial power
Greater activities of the enzymes of the phosphagen system
More CP and ATP in muscle

Greater mitochondrial power

Greater activities of the enzymes of the phosphagen system

More CP and ATP in muscle

Explanation:

During high intensity exercises the large amount of muscle energy is required. This creates a high demand of ATP. The phosphagen system is the quickest method to resynthesize ATP. The creatine phosphate in the absence of oxygen provides phosphate to produce ATP. This provides greater mitochondrial power, in the rest the CP and ATP remain stored in the muscles. The enzymatic activity enhances with the phosphagen system.