IntroductionExercise at high intensity may cause lower affective responses toward exercise compared with moderate intensity exercise. We aimed to elucidate affective valence and enjoyment in high- and moderate-high interval exercise.MethodsTwenty recreationally active participants underwent three different treadmill running exercise sessions per week over a 3-week period, in randomized order; CE70: 45 min continuous exercise at 70% of heart rate maximum, INT80: 4 × 4 min intervals at 80% of HRmax, INT90: 4 × 4 min intervals at 90% of HRmax. Pre-tests (...) included graded submaximal steady state intensities and a test to exhaustion for determining peak oxygen uptake and HRmax. Affective valence was measured before, during and after the sessions using the Feeling Scale. Enjoyment was assessed before and after the sessions applying the Physical Activity Enjoyment Scale and during the sessions using the Exercise Enjoyment Scale.ResultsThe participants felt lower pleasure during INT90 sessions compared with INT80 and CE70 sessions, with no differences between INT80 and CE70 sessions. There were higher enjoyment after INT80 sessions versus CE70 sessions, and no differences between INT90 and CE70 or INT80. For enjoyment during exercise, CE70 were perceived more enjoyable, and INT80 and INT90 less enjoyable in week 2 and 3 than in week 1.ConclusionThe negative affective consequences associated with high intensity interval exercise can be alleviated by keeping the intensity at or around 80% of HRmax while preserving the beneficial enjoyment responses associated with interval exercise. (shrink)

ObjectiveThe scarcity of research on associations between inflammatory markers and symptoms of depression and anxiety during adolescence has yielded inconsistent results. Further, not all studies have controlled for potential confounders. We explored the associations between baseline inflammatory markers and psychological distress including moderators at follow-up in a Norwegian adolescent population sample.MethodsData was derived from 373 girls and 294 boys aged 15–18 years at baseline, in the Fit Futures Study, a large-scale 2-year follow-up study on adolescent health. Baseline data was gathered (...) from 2010 to 2011 and follow-up data from 2012 to 2013. Psychological distress was measured with Hopkins Symptom Checklist. Serum levels of the following inflammatory markers were measured: C-reactive protein, Interleukin 6, Transforming growth factor alpha, Tumor necrosis factor alpha variant 1, and variant 2. Independent associations between baseline inflammatory markers and HSCL-10 at follow-up were explored by linear regressions, in sex-stratified analyses.ResultsIn girls, analyses showed positive associations between all inflammatory markers and HSCL-10, except for TRANCE. However, all associations were non-significant in crude as well as in adjusted analyses. In boys, CRP and TGF-α showed significant associations with HSCL-10, that remained significant after adjustment. Additionally, moderators were found. In boys, CRP was associated with HSCL-10 in those with high body fat and those being physical inactive, and the association between TWEAK and HSCL-10 was dependent upon sleep duration.ConclusionThere were significant prospective associations between CRP, TFG-α, and HSCL-10 in boys aged 15–18 years at baseline. (shrink)