“…They suggested that these differences were related to a central nervous system failure to activate motor units and to some abnormal intrinsic muscle properties. These lower results could be also attributed to other factors including (a) sedentary lifestyle, (b) poor motivation to perform a test (c) the lack of possibilities to take part into physical activities (d) difficulties to accurate fitness assessment in this population, (e) physical characteristics such as short stature, postural control problems, and cardiovascular insufficiency (f) chronotropic incompetence (misbalance between maximal heart rate and metabolic levels at maximal or submaximal effort) and (g) reduced strength (Borji et al, 2014;Graham & Reid, 2000;Stanišić, 2012;Van de Vliet et al, 2006). Several studies indicated that athletes with higher degree of II scored lower in motor skills and fitness tasks (Elmahgoub, Van de Velde, Peersman, Cambier, & Calders, 2012;Golubovic et al, 2012;Lejčarová, 2009).…”