1 23 European Journal of Applied Physiology ISSN 1439-6319 Eur J Appl Physiol DOI 10.1007/s00421-012-2464-z Power output in vertical jumps: does optimum loading depend on activity profiles? Nemanja Pazin, Bobana Berjan, Aleksandar Nedeljkovic, Goran Markovic & Slobodan Jaric