The use of the Circadian Type Inventory as a measure of the circadian constructs of vigour and rigidity

Abstract

The Circadian Type Inventory (Folkard 1987) was administered to 191 students (150 females and 41 males). Corrected item to total correlations for both the Vigour and Rigidity scales were low to moderate. The internal reliabilities of the scales indicate that Vigour is statistically more homogeneous (0.74) than Rigidity (0.58). In the absence of the original CTI correlation matrix, replication using a 2-factor principal component varimax solution was undertaken. It explained only 26.7% of the variance. Post hoc factor analyses yielded 3 factors which explained 33.4% of the variance. The relatively low amounts of variance explained and the inadequate transfer of the circadian constructs of Rigidity and Vigour into question items does not recommend the use of the CTI to measure circadian rhythm characteristics in order to predict tolerance to shiftwork.

The impact of shiftwork on health: a literature review

“…Several studies examined the reactions and feelings of the partners of shiftworkers (Smith et al . , Newey & Hood , Strazdins et al . ).…”

“…In two studies, the addition of children to a shiftworking household meant more sleepiness and more domestic disruption (Lushington et al 1997, Sallinen et al 2005, particularly for the female shiftworkers (Lushington et al 1997). Other studies report family-related advantages and disadvantages of shiftwork (Verhaegen et al 1987, Barton et al 1993, Smith et al 1993, Taylor et al 1997, Strazdins et al 2006. Several studies examined the reactions and feelings of the partners of shiftworkers (Smith et al 1993, Newey & Hood 2004, Strazdins et al 2006.…”

“…Other studies report family-related advantages and disadvantages of shiftwork (Verhaegen et al 1987, Barton et al 1993, Smith et al 1993, Taylor et al 1997, Strazdins et al 2006. Several studies examined the reactions and feelings of the partners of shiftworkers (Smith et al 1993, Newey & Hood 2004, Strazdins et al 2006. In one study, 53% of participants were unhappy or very unhappy with their partners' shiftwork, and a third of all respondents had tried to persuade their partners to change their working hours (Smith et al 1993).…”

“…Several studies examined the reactions and feelings of the partners of shiftworkers (Smith et al 1993, Newey & Hood 2004, Strazdins et al 2006. In one study, 53% of participants were unhappy or very unhappy with their partners' shiftwork, and a third of all respondents had tried to persuade their partners to change their working hours (Smith et al 1993). This type of research is rare in the body of shiftwork literature, although some research has explored whether partner support helps a worker to better tolerate shiftwork (Robson & Wedderburn 1989).…”

Compare the educational achievement of medical students with different circadian rhythms in difficult courses of basic sciences

“…Different methods have been found for measuring the morning-evening pattern of people in the references, each of which has been designed to measure habits of different age and working groups. [ 24 25 26 27 28 29 ] There are two classes of methods for measuring the biological patterns: Subjective and objective. The objective methods are more reliable and have a higher accuracy.…”