Halliwill, JohnCursetjee, Hope2024-08-302024-08-302024https://hdl.handle.net/1794/2991046 pagesReduced heart rate variability (HRV) following resistance (RE), compared to aerobic (AE) exercise indicates greater cardiovascular strain (Forjaz et al., 2000; Pescatello et al., 1999); however, performance and preference are not commonly considered as determinants of this response. Therefore, we assessed the impact of RE and AE on HRV and further examined responses based on modality performance and preference. Twelve young, healthy individuals (11M, 1F) performed separated bouts of RE, 6x10 reps at 70% of 1-repetition maximum (1-RM) and AE, 30min at 70% of their peak oxygen consumption (VO2peak). HRV was assessed at baseline (BL), immediately following (IP), and at 30-minute intervals for 2 hours after exercise. All variables were assessed via 2-way repeated measures ANOVA and results reported as mean±SD. When exercise conditions were examined separately, HF was significantly reduced IP in AE only, despite R-R interval returning to baseline values by 60 minutes (p=0.13). Although not statistically significant following RE (p=0.13), lower trends may have influenced a slower return of R-R interval at 60 (p=0.05). These data suggest an earlier restoration of vagal tone following AE, compared to RE. However, when performance and preference are considered between the conditions HF was reduced at IP (p=0.03; p=0.05) and tended to remain lower at 30-min (p=0.051; p=0.09). Relative exercise workloads achieved during exercises that are favored, or preferred may influence HRV following exercise regardless of modality.en-USCC BY-NC-ND 4.0heart rate variabilityaerobic exercisePerformancecardiovascular healthresistance exerciseThesis/Dissertation0009-0008-2733-2335