“…However, in patients with AS, barriers such as fatigue, lack of time and the fact that exercise is tiring are reported to be negatively related to participation in physical activities (Da Costa et al, 2004;Passalent et al, 2010;Sundstrom et al, 2002). Factors that are related to being physically active are beliefs in the benefits of exercise, higher educational level, motivation and medical follow-up by a rheumatologist rather than a general practitioner (Brophy et al, 2013;Haglund et al, 2012;Passalent et al, 2010;Santos et al, 1998;Sundstrom et al, 2002), whereas inconclusive results have been found regarding self-efficacy (Barlow, 1998;Lim et al, 2005), disease activity (Arturi et al, 2013;Fongen et al, 2013;Haglund et al, 2012;Santos et al, 1998;Stockdale et al, 2014;Swinnen et al, 2014) and disability (Falkenbach, 2003;Haglund et al, 2012;Santos et al, 1998).…”