“…Mixed results have been reported in previous studies examining the effect of exercise on HRV. Variations in exercise doses and intensity of exercise may be responsible for the mixed results across the studies (Borghi-Silva et al, 2009;Carter, Banister, & Blaber, 2003;Okazaki et al, 2005;Sloan et al, 2009). The quantities of work and exercise intensities completed by the participants in the current study were lower than in other research reporting changes in HRV (Carter et al, 2003;Okazaki et al, 2005;Sloan et al, 2009).…”