This is from one of David Costill's books:
"When tested for vertical jump, the average, untrained individual can jump 20.9 inches, compared to a mean jump of 13.5 inches for a group of elite marathon runners.
Although it might seem logical that such runners, known to have a predominance of slow twitch fibers in their leg muscles, might inherit this inability to jump, some individual cases suggest that this is not the case. For example, Lou Castagnola, a 2:17 marathoner in 1967, was found to have a vertical leap of only 11.5 inches. Following the 1968 Olympic marathon trial he stopped training and led a rather sedentary life. Three years later we reexamined him and found that while his VO2 max had declined from 72.4 ml/kg x min to 47.6 ml/kg x min, his vertical leap had increased to 20.3 inches. Despite a lack of physical ability, his explosive leg strength had increased 77 percent."