Although the time-efficiency and physiological benefits of SIT are well-documented, it has been criticized for eliciting adverse psychological responses in many adults, which are a potential barrier to long-term exercise adherence. To date, minimal research has studied the influence of exercise modality on perceptual responses to SIT. PURPOSE: To compare perceptual responses between different modalities of SIT in adults. METHODS: Subjects consisted of 11 healthy, non-obese men and women (age= 27±9 year, %BF=16±5%) who are physically active (PA=5±2hr). Participants initially underwent graded exercise testing to determine VO₂max and peak power output (PPO) on the arm (ACE) and leg cycle ergometer (LCE). On two separate days, subjects performed four 20-second sprints at 130% PPO at cadence between 120-130 rev/min, interspersed with 2-minute recovery on the ACE or LCE at 20% PPO. Gas exchange data, HR, and perceptual responses including affective valence (FS) and rating of perceived exertion (RPE) were obtained throughout exercise. PACES was administered post-exercise to assess overall enjoyment of each modality. Blood samples were acquired to assess changes in blood lactate concentration (BLa). RESULTS: Repeated Measures Anova showed no significant differences in affective valence (FS) (P=0.74) between exercise modalities. Although results showed no effect of mode for RPE (P=0.38), there was a significant time X mode interaction (p=0.017) and higher RPE was revealed during ACE. Mean PACES was equal to 108.5±14.3 for LCE and 105.9 ± 19.9 for ACE (P>0.05). In response to LCE and ACE, BLa increased pre- to post-exercise (P



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