Comfort has been de ned as a ‘pleasant state or relaxed feeling of a human in reaction to its environment’ (Vink & Hallbeck 2012:271). Thus, a change in neck and upper back pain intensity needs not correlate to a change in perceived sitting comfort, as the concept of comfort includes other body parts in which pain is felt as well as environmental and psychosocial factors (Vink & Hallbeck 2012). Interestingly, the subject did suffer an episode of her familiar lower back muscle tightness one week after the end of the study period. It is possible that the decreased comfort level may have been an early indicator of this MSD (Lindegard et al. 2012; Wahlstrom et al. 2004), and that this may offer an alternative explanation for the increase in her VADS measurements.