43 Conceptualization and Measurement of Proactive Vitality Management converted the items for daily use (e.g., “Today I asked colleagues for advice”, 1 = totally disagree, 5 = totally agree). Relaxation. We used three items from the recovery experience questionnaire (Sonnentag & Fritz, 2007) to measure the extent to which participants had engaged in relaxation the evening before (e.g., “Yesterday, during my free evening, I kicked back and relaxed”, 1 = totally disagree, 5 = totally agree). Psychological detachment. We measured psychological detachment from work the evening before with three items from the recovery experience questionnaire (Sonnentag & Fritz, 2007; e.g., “Yesterday, during my free evening, I forgot about work”, 1 = totally disagree, 5 = totally agree). Vigor. We measured vigor with six items from the Profile of Mood States (POMS; McNair, Lorr, & Droppleman, 1971). Participants indicated the extent to which they, for example, felt “lively” or “energetic” that day (1 = not at all, 5 = extremely). Fatigue. We measured fatigue with five items from the POMS (McNair et al., 1971). Participants indicated the extent to which they, for example, felt “exhausted” or “weary” that day (1 = not at all, 5 = extremely). In-role work performance. We measured in-role work performance using three items developed by Williams and Anderson (1991), converted for daily use (e.g., “Today I have adequately completed assigned duties”, 1 = totally disagree, 5 = totally agree). Creative work performance. Tomeasure creative work performance, we used five items developed by Zhou and George (2001), converted for daily use (e.g., “Today I came up with new and practical ideas to improve performance”, 1 = totally disagree, 5 = totally agree). Cognitive performance. The objective Remote Associates Test (RAT; Mednick, 1968; Dutch version by Chermahini, Hickendorff, & Hommel, 2012) was used to measure cognitive performance. In this test, participants are provided with word triplets and asked to come up with a fourth word that is associatively related to all three stimulus words. An example: participants were provided with the words ‘cup’, ‘bean’ and 2
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