That is not what I was saying at all. I was simply saying that speed increases through training are far more limited then other aspects of training such as strength and endurance which both have a much higher ceiling. You certainly can increase speed, but the increases are nominal in direct comparison to previously stated performance abilities. For example, you can increase speed through learning proper running mechanics, improving technique, and skill based training. Physiologically, there are genetic limitations that can not be overridden but do allow for some improvement, largely though improved muscle kinase, creatine phosphokinase, and total lactate dehydrogenase activity. However, I still hold that these increases are not near the same magnitude of the others. The following excerpt demonstrates this.
"Frequent questions concern the relative contribution of natural endowment (genotype) to physiologic function, neuromuscular coordination, and exercise performance (phenotype). For example, to what extent does heredity determine the extremely high aerobic capacities of athletes? Do these exceptionally high levels of functional capacity simply reflect intensive training? How does familial aggregation affect skeletal muscle capillary density and enzyme activity and their response to training.
Early research focused on 15 pairs of identical twins and 15 pairs of fraternal twins raised in the same city and with parents of similar socioeconomic backgrounds. Heredity alone accounted for up to 93% of observed differences in VO2max. The capacity of the short-term glycolytic energy system indicated a genetic determination of approximately 81%, while maximum heart rate showed approximately 86% genetic determination...Combining the estimated effects of genetics and familial evironment raises the upper limit of genetic determination.
Today, sports scientist use laboratory and field testing to screen athletes for performance and physiologic capacities, including the application of molecular genetics with the ACTN3 gene that encodes the protein actinin in skeletal muscle to assess potential for sports and athletic performance."
Ref: Mcardle, William D., Frank I. Katch, and Victor L. Katch. Exercise Physiology. 7th ed. Baltimore: Wolters Kluwer, 2010. Print.
I only neg arrogant douches, not opposing opinions.