# Does low volume high-intensity interval training elicit superior benefits to continuous low to moderate-intensity training in cancer survivors? PMID: 29468132 Journal: World Journal of Clinical Oncology Published: 2018 Feb 10 Authors: Toohey K, Pumpa K, McKune A, Cooke J, DuBose KD, Yip D, Craft P, Semple S ## Question To determine the impact of low-volume high-intensity interval training and continuous low-to-moderate intensity exercise training on cardiovascular disease risk and health outcomes in cancer survivors. ## Summary This randomized 12-week trial compared supervised low-volume high-intensity interval cycling, supervised continuous low-to-moderate intensity cycling, and a non-exercise control group in sedentary cancer survivors within 24 months of diagnosis. Low-volume HIIT improved six-minute walk distance, sit-to-stand performance, waist circumference, and quality of life more than the comparator groups, while both exercise groups improved quality of life. The protocol was short in high-intensity work time but supervised and clinically screened. ## Population - Sedentary cancer survivors within 24 months of diagnosis, mostly female breast cancer survivors in the post-treatment phase. - Sample size: 75 - Age: 51.48 +/- 12.45 years - Sex: Analyzed completers were female; recruitment included 83 female and 2 male before exclusions. - Fitness level: Sedentary - Health status: Cancer survivors after acute treatment effects had dissipated. ## Methodology - 12-week randomized controlled trial with three parallel groups: LVHIIT, CLMIT, and control. - 12 weeks - Supervised exercise sessions in a gym or clinical exercise setting, supervised by an Accredited Exercise Physiologist. - Randomized and controlled study design. ## Protocol - LVHIIT. - Modality: Stationary cycling. - Work intervals: 30 seconds. - Recovery: 60 seconds. - Sets or repetitions: 7 intervals after progression; started at 3 intervals. - Intensity: >=85% predicted maximal heart rate. - Session duration: Approximately 16 minutes after full progression including warmup and cooldown. - Frequency: 3 sessions per week. - Program length: 12 weeks. - Progression: One interval added per week over four weeks until seven intervals by week 5. - CLMIT. - Modality: Stationary cycling. - Work intervals: Continuous 20 minutes. - Sets or repetitions: One continuous bout. - Intensity: <=55% predicted maximal heart rate. - Session duration: 30 minutes including 5-minute warmup and 5-minute cooldown. - Frequency: 3 sessions per week. - Program length: 12 weeks. ## Outcomes ### Six-minute walk test Status: improved LVHIIT increased six-minute walk distance from 510.7 +/- 114.9 m to 607.7 +/- 85.5 m, with a larger effect than CLMIT and control. Interaction effect P<0.01; LVHIIT d=0.97 (95% CI 0.36, 1.56), CLMIT d=0.17, control d=-0.13. ### Sit-to-stand Status: improved LVHIIT improved sit-to-stand time from 10.1 +/- 2.8 s to 8.1 +/- 2.1 s. Interaction effect P<0.01; LVHIIT d=-0.83 (95% CI -1.40, -0.22), CLMIT d=-0.59, control d=0.36. ### Waist circumference Status: improved LVHIIT reduced waist circumference from 91.1 +/- 11.7 cm to 85.7 +/- 10.5 cm, while CLMIT and control changed little. Interaction effect P=0.01; LVHIIT d=-0.48 (95% CI -1.10, 0.10), CLMIT d=-0.05, control d=0.11. ### Quality of life Status: improved Overall FACT-G quality of life improved in both exercise groups, with the largest effect in LVHIIT. Interaction effect P<0.01; LVHIIT d=1.11 (95% CI 0.50, 1.72), CLMIT d=0.57, control d=-0.15. ### Vessel stiffness parameters and biomarkers Status: no clear change No interaction effects were found for vessel stiffness parameters or biomarkers. Authors reported no interaction effects; selected time effects included AP P=0.02 and CSP P=0.07. ### Adverse events Status: no clear change No adverse events were reported during the study. ## Practical Insights - In a clinically screened and supervised cancer survivor population, very short high-intensity cycling intervals can improve functional capacity and waist circumference over 12 weeks. - Short hard-work time does not mean low supervision needs in clinical populations. - Gradual progression from fewer intervals to the full interval count is a practical safety and tolerability feature. ## Limitations - Diet and daily physical activity outside sessions were not controlled. - Cardiorespiratory fitness was assessed with six-minute walk rather than VO2max testing. - No male participants completed the study. - Different medications and cancer treatment protocols could have influenced results. - The control group had high attrition. ## Safety And Adherence - No adverse events were reported. - Blood pressure was monitored immediately before and after each exercise session. - Participants were clinically screened with exclusions for severe hypertension, pregnancy, brain or metastatic bone cancer, bone pain, and exercise-limiting musculoskeletal problems. ## Original Sources - [PubMed](https://pubmed.ncbi.nlm.nih.gov/29468132/) (pubmed) - [DOI](https://doi.org/10.5306/wjco.v9.i1.1) (doi) - [PMC full text](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5807887/) (full text) ## Agent Guidance Preserve the paper-level scope of this note. Do not generalize beyond the population, protocol, measured outcomes, and limitations above.