title: Aerobic and resistance exercise reinforcement and discomfort tolerance predict meeting activity guidelines.
abstract: Understanding individual-differences of those people who do and do not meet physical activity recommendations could inform targets for increasing physical activity. Exercise reinforcement may be one such individual-level determinate, but it is not yet known whether those who meet activity guidelines have a greater relative reinforcing value (RRV) of aerobic exercise training (RRVAT) or resistance training (RRVRT). The predictors of RRVATor RRVRTare also not yet known.
  
  
  
  To determine whether individuals who meet aerobic activity or muscle strengthening activity guidelines have greater RRVATor RRVRTand whether the preference and tolerance for exercise intensity predicts RRVATor RRVRT.
  
  
  
  Men (n=38) and women (n=50) were measured for RRVAT, RRVRT, minutes of vigorous physical activity, usual resistance training behavior, and completed the Preference for and Tolerance of the Intensity of Exercise Questionnaire.
  
  
  
  Individuals who met physical activity guidelines for aerobic activity and muscle strengthening activity had 58% greater RRVATand 54% greater RRVRT,respectively, than those who did not meet these guidelines. Preference and tolerance for exercise intensity was associated (p<0.01) with greater RRVRT, but not RRVAT.
  
  
  
  Having greater RRV of a mode of exercise is associated with meeting activity guidelines for that mode of exercise. Discomfort tolerance during exercise is associated with greater RRV of resistance exercise.
authors.affiliation: USDA, Agricultural Research Service, Grand Forks Human Nutrition Research Center, 2420 2nd Ave N., Grand Forks, ND, 58202, USA. Electronic address: kyle.flack@ars.usda.gov.
authors.forename: Kyle D
authors.initials: KD
authors.lastname: Flack
authors.affiliation: USDA, Agricultural Research Service, Grand Forks Human Nutrition Research Center, 2420 2nd Ave N., Grand Forks, ND, 58202, USA.
authors.forename: LuAnn
authors.initials: L
authors.lastname: Johnson
authors.affiliation: USDA, Agricultural Research Service, Grand Forks Human Nutrition Research Center, 2420 2nd Ave N., Grand Forks, ND, 58202, USA. Electronic address: james.roemmich@ars.usda.gov.
authors.forename: James N
authors.initials: JN
authors.lastname: Roemmich
mesh_terms: D061725:Accelerometry; D000328:Adult; D015444:Exercise / Q000523:psychology*; D005260:Female; D006291:Health Policy; D006801:Humans; D007206:Individuality; D008297:Male; D009042:Motivation; D058748:Pain Perception; D017288:Pain Threshold / Q000523:psychology*; D011581:Psychological Tests; D012044:Regression Analysis; D012054:Reinforcement, Psychology; D055070:Resistance Training; D012737:Sex Factors; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Discomfort; Motivation; Pain; Physical activity; Tolerance; Weight training