TY - JOUR T1 - Effects of run sprint interval training on healthy, inactive, overweight/obese women: A pilot study AU - Rowley, Taylor W. AU - Espinoza, Jennifer L. AU - Akers, Jeremy D. AU - Wenos, David L. AU - Edwards, Elizabeth S. Y1 - 2017/01/01 PY - 2017 DA - 2017/01/01 N1 - doi: 10.1139/facets-2016-0004 DO - 10.1139/facets-2016-0004 T2 - FACETS JF - FACETS SP - 53 EP - 67 VL - 2 PB - Canadian Science Publishing N2 - This study examined the effects of a 12 week, treadmill-based, run sprint interval training (SIT) protocol compared with that of a moderate-intensity continuous training (MICT) protocol in healthy, inactive, overweight/obese women, on cardiovascular disease risk factors. After random assignment, the SIT group completed 4?10???30 s maximal sprints, with a 4 min active recovery between sprints, and the MICT group completed 30?60 min at moderate intensity (45?55% heart rate reserve (HRR)). The rate of perceived exertion (RPE) was recorded for each session, and perceived enjoyment was quantified every 3 weeks. Clinical and fitness testing were completed at baseline, 6 weeks, and 12 weeks. Twelve female participants (age: 34.1?±?6.1; body mass index (BMI): 31.3?±?6.8; VO2peak: 27.0?±?6.2) completed the intervention. There were significant main effects for time for VO2peak (p?=?0.001), body fat percentage (p?=?0.001), and session RPE (p?=?0.006). VO2peak improved 20.7% in the SIT group (n?=?5) and 24.4% in the MICT group (n?=?7). Body fat percentage reduced by 1.7% in the SIT group and 2.6% in the MICT group. Perceived enjoyment was similarly high between the groups despite higher session RPE in the SIT group (p?=?0.441). SIT training on a motor-driven treadmill elicits similar improvements in oxygen utilization and body composition as moderate-intensity training in this population. AB - This study examined the effects of a 12 week, treadmill-based, run sprint interval training (SIT) protocol compared with that of a moderate-intensity continuous training (MICT) protocol in healthy, inactive, overweight/obese women, on cardiovascular disease risk factors. After random assignment, the SIT group completed 4?10???30 s maximal sprints, with a 4 min active recovery between sprints, and the MICT group completed 30?60 min at moderate intensity (45?55% heart rate reserve (HRR)). The rate of perceived exertion (RPE) was recorded for each session, and perceived enjoyment was quantified every 3 weeks. Clinical and fitness testing were completed at baseline, 6 weeks, and 12 weeks. Twelve female participants (age: 34.1?±?6.1; body mass index (BMI): 31.3?±?6.8; VO2peak: 27.0?±?6.2) completed the intervention. There were significant main effects for time for VO2peak (p?=?0.001), body fat percentage (p?=?0.001), and session RPE (p?=?0.006). VO2peak improved 20.7% in the SIT group (n?=?5) and 24.4% in the MICT group (n?=?7). Body fat percentage reduced by 1.7% in the SIT group and 2.6% in the MICT group. Perceived enjoyment was similarly high between the groups despite higher session RPE in the SIT group (p?=?0.441). SIT training on a motor-driven treadmill elicits similar improvements in oxygen utilization and body composition as moderate-intensity training in this population. 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