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Marcia I. Milne, Wendy M. Rodgers, Craig R. Hall and Philip M. Wilson

Across various social cognitive theories, behavioral intention is broadly argued to be the most proximal and important predictor of behavior (Ajzen, 1991; Gibbons, Gerrard, Blanton, & Russell, 1998; Rogers, 1983). It seems probable that an intention to increase behavior might be differentially determined from an intention to maintain behavior. Thus, the purpose of the current study was to examine (1) the change in two types of behavioral intention over time and (2) the relationship between intention and the social-cognitive factor mental imagery. Behavioral intention, exercise imagery, and observed exercise behavior was measured in 68 exercise initiates participating in a 12-week exercise program. Results revealed that behavioral intention to increase exercise behavior decreased over the exercise program, whereas intentions to maintain exercise behavior increased. Appearance and technique imagery were found to be significant predictors of intention to increase behavior during the first 6 weeks of the program, and only appearance imagery predicted intention to maintain exercise behavior during the last 6 weeks. These findings suggest that the two types of behavioral intention are distinguishable and may be useful targets for exercise behavior interventions.

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Exercise Psychology Starting up or Starting Over: The Role of Intentions to Increase and Maintain the Behavior of Exercise Initiates Marcia I. Milne * Wendy M. Rodgers * Craig R. Hall * Philip M. Wilson * 6 2008 30 3 285 301 10.1123/jsep.30.3.285 Sport Psychology Achievement Goals

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Ryan D. Henke, Savana M. Kettner, Stephanie M. Jensen, Augustus C.K. Greife and Christopher J. Durall

Trials • Cochrane Clinical Answers • Cochrane Database of Systematic Reviews • MEDLINE • MEDLINE with Full Text • SPORTDiscus with Full Text Inclusion and Exclusion Criteria Inclusion • Limited to human subjects 10–19 years old • Aerobic exercise initiated within 4 weeks after SRC diagnosis • Published

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Lara A. Carlson, Kaylee M. Pobocik, Michael A. Lawrence, Daniel A. Brazeau and Alexander J. Koch

melatonin secretion. But evening exercise (initiated ∼18:24 h), during the rise in melatonin, elicited an acute increase in melatonin production and advanced the onset of melatonin by 30 minutes during the night after exercise. 13 In the present study, the PMEX was initiated at 16:00 hours, and subjects

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Bhanu Sharma and Brian W. Timmons

-TBI acute metabolic imbalances can be exacerbated by a secondary injury ( 21 , 47 , 57 ) and have guided decisions to rest following brain injury ( 59 ). Animal studies have also suggested that early exercise (initiated 6 d postinjury) can worsen outcome, whereas beginning exercise 14 days postinjury

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Nicholas Hattrup, Hannah Gray, Mark Krumholtz and Tamara C. Valovich McLeod

included studies focused on patient-initiated activity or whether they followed recommendations rather than clinician programmed exercise or treatment. 5 Based upon 2 articles included in this review, early controlled aerobic exercise initiated within 3 to 11 days postconcussion is safe but may not be

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Emma M. Crum, Matthew J. Barnes and Stephen R. Stannard

kinetics and improves exercise tolerance during severe-intensity exercise initiated from an elevated metabolic rate . American Journal of Physiology. Regulatory, Integrative and Comparative, 305 ( 12 ), 1441 – 1450 . PubMed ID: 24089377 doi:10.1152/ajpregu.00295.2013 10.1152/ajpregu.00295.2013 Cermak

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Kathleen S. Wilson and Kevin S. Spink

: 30973746 doi:10.1037/hea0000734 10.1037/hea0000734 30973746 13. DuCharme KA , Brawley LR . Predicting the intentions and behavior of exercise initiates using two forms of self-efficacy . J Behav Med . 1995 : 18 ( 5 ): 479 – 97 . PubMed ID: 884771 doi:10.1007/bf01904775 8847716 10.1007/BF01904775 14

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Jemima C. John, Shreela V. Sharma, Deanna Hoelscher, Michael D. Swartz and Chuck Huber

://www.emory.edu/education/mfp/eff.html . Published 2002 . Accessed July, 2017. 30. Ducharme K , Brawley L . Predicting the intentions and behaviors of exercise initiates using two forms of self-efficacy . J Behav Med . 1995 ; 18 : 479 – 497 . PubMed ID: 8847716 doi:10.1007/BF01904775 8847716 10.1007/BF01904775 31. Perkins J , Multhaup

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Florence-Emilie Kinnafick, Cecilie Thøgersen-Ntoumani, Sam O. Shepherd, Oliver J. Wilson, Anton J.M. Wagenmakers and Christopher S. Shaw

social science students and researchers ( 2nd ed. ). London, UK : Sage . Rodgers , W.M. , Hall , C.R. , Duncan , L.R. , Pearson , E. , & Milne , M.I. ( 2010 ). Becoming a regular exerciser: Examining change in behavioural regulations among exercise initiates . Psychology of Sport and