34 Chapter 2 we created a mean score for all work-related strategies, as well as a mean score for all the micro-breaks. Overall, the results show that PVM related moderately but positively to both work-related strategies and micro-breaks. On the between-person level (i.e., aggregated mean scores), PVM correlated r = .51, p < .001 with work-related strategies, and r = .27, p < .01 with micro-breaks. On the daily level, PVM correlated r = .49, p < .001 with work-related strategies, and r = .29, p < .001 with micro-breaks. Finally, when we group-mean centered the variables to represent actual within-person fluctuations, the correlation between PVM and work-related strategies was r = .26, p < .001. However, the relationship between PVM and micro-breaks became nonsignificant (r = .06, p = .157). It seems that work-related strategies and micro-breaks might be proactively initiated to manage vitality for work. However, the empirical overlap between these two types of strategies and proactive vitality management is relatively low, especially for microbreaks. This supports our point of view that there are numerous strategies individuals may proactively employ to manage their vitality, and that these will likely vary according to individual and momentary needs and differences. STUDY 3: NOMOLOGICAL NETWORK OF PROACTIVE VITALITY MANAGEMENT The second objective of the present research is to explore the wider nomological network of proactive vitality management (PVM). In doing so, we aim to find support for convergent, discriminant, and criterion validity of the construct. Convergent Validity First of all, we examine whether proactive personality and self-insight are related to PVM because these personal characteristics may increase the tendency to engage in such behavior. Proactive individuals are predisposed to engage in behavior that alters their environment (Bateman & Crant, 1993). Taking control to exert influence and make changes may be accompanied by proactively managing helpful resources (i.e., physical and mental energy) to achieve such goals. In addition, proactively managing physical and mental energy to promote work goals may require some level of awareness of one’s
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