title: The impact of job strain on the predictive validity of the theory of planned behaviour: an investigation of exercise and healthy eating.
abstract: OBJECTIVE
  This study examined the impact of the job strain model on exercise and healthy eating within the framework of the Theory of Planned Behaviour.
  
  
  METHODS
  Participants completed a questionnaire measuring the components of the Theory of Planned Behaviour and the job strain model. A follow-up questionnaire a week later measured behaviour.
  
  
  METHODS
  The questionnaires were completed by e-mail. The initial questionnaire was completed by 331 employees, and 286 follow-up questionnaires were returned.
  
  
  RESULTS
  Job demands affected exercise indirectly by lowering perceptions of behavioural control over exercise. However, variables from the job strain model were not related to exercise intentions or behaviour. In contrast, employees in passive jobs intended to eat more sweets and snack foods and employees in low strain jobs were more likely to realize their intentions to eat more sweets and snack foods. However, variables from the job strain model did not influence consumption of fruit and vegetables.
  
  
  CONCLUSIONS
  While people may consider the impact of job strain on exercise whilst making decisions about whether or not to exercise, job strain has a more direct impact on healthy eating. However, job strain may only affect consumption of so-called 'high density' foods, rather than foods such as fruit and vegetables.
authors.affiliation: Psychology Academic Group, Middlesex University, UK. n.payne@mdx.ac.uk
authors.forename: Nicola
authors.initials: N
authors.lastname: Payne
authors.forename: Fiona
authors.initials: F
authors.lastname: Jones
authors.forename: Peter R
authors.initials: PR
authors.lastname: Harris
mesh_terms: D000328:Adult; D002055:Burnout, Professional / Q000523:psychology*; D002149:Energy Intake; D015444:Exercise; D005247:Feeding Behavior; D005260:Female; D005500:Follow-Up Studies; D015438:Health Behavior; D006801:Humans; D033182:Intention; D007588:Job Satisfaction; D008297:Male; D008875:Middle Aged; D009042:Motivation; D011446:Prospective Studies; D011582:Psychological Theory; D015203:Reproducibility of Results; D013315:Stress, Psychological / Q000523:psychology*; D011795:Surveys and Questionnaires