“…Motivational self-talk (Barwood, Corbett, Wagstaff, McVeigh, & Thelwell, 2015;Blanchfield et al, 2014) and psychological skills training packages (Barwood, Thelwell, & Tipton, 2008) appear to reduce perception of effort, and they have been shown to improve endurance performance. Another study, however, found that using motivational self-talk when performing in the heat did not reduce perception of effort and, instead, helped performers to perform for a longer duration when they reached near-maximal levels of effort (Wallace et al, 2017). In addition, mental fatigue (Van Cutsem et al, 2017) and emotion suppression (Wagstaff, 2014) increase perception of effort and detrimentally affect endurance performance.…”