“…Diverse studies have highlighted the positive relation between higher levels of sample entropy and health (Meigal et al, 2009; D. Zhang et al, 2009); indeed, it has been found that higher levels of anxiety are associated with lower levels of sample entropy (Bornas et al, 2006); conversely, promotion of relaxation leads to higher levels of sample entropy (de la Torre-Luque, Caparrós-González, Bastard, Vico, & Buela-Casal, 2016; Porta et al, 2013; Vlemincx, Vigo, Vansteenwegen, van den Bergh, & van Diest, 2013). Accordingly, it was found that lower levels of sample entropy were observed when the stressor was present (especially during anticipatory-anxiety and exposition phases); during stress recovery, the levels of sample entropy became higher, being significantly greater when the participants were exposed to the preferred-music intervention.…”