“…The results showed that athletes and non-athletes did not differ significantly in levels of investigated prooxidants (O 2 •-, H 2 O 2 , • NO, TBARS), but athletes had significantly higher levels of SOD and lower level of CAT activity. Higher SOD activity in athletes was also found in other studies, including studies involving karate athletes (Naghizadeh et al, 2009) soccer players (Briites et al, 1999;Cazzola et al, 2003), rugby players (Evelson et al, 2002;), jump-trained subjects (Ortenblad et al, 1997) and students of Physical Education and Sports Sciences (Balakrishnan & Anuradh, 1998). Regarding CAT activity, there is a number of previous studies that also found that it's acitivity is decreased in athletes compared with controls, but there are also a number of studies that reported no change in CAT activity as a consequence of exercise training (Miyazaki et al, 2001;Lekhi et al, 2007;Metin et al, 2003;Ortenblad et al, 1997;Balakrishnan & Anuradh, 1998).…”