[1] Univ Zaragoza, Fac Hlth & Sport Sci, Dept Physiotherapy & Nursing, Ronda Misericordia 5, Huesca 22001, Spain
[2] European Univ Miguel de Cervantes, Physiol Lab, Valladolid, Spain
[3] ASPAYM Castilla & Leon, Res Ctr Phys Disabil, Valladolid, Spain
[4] Univ Pittsburgh, Sch Educ, Dept Hlth & Phys Act, Pittsburgh, PA 15260 USA