Kimberley L Way1, Angelo Sabag2, Rachelle N Sultana2, Michael K Baker3, Shelley E Keating4, Sean Lanting5, James Gerofi6, Vivienne H Chuter4, Ian D Caterson6, Stephen M Twigg7, Nathan A Johnson2. 1. Faculty of Medicine and Health, Discipline of Exercise and Sports Science, University of Sydney, Camperdown, NSW, Australia; The Boden Collaboration for Obesity, Nutrition, Exercise and Eating Disorders, University of Sydney, Camperdown, NSW, Australia; The Charles Perkins Centre, University of Sydney, Camperdown, NSW, Australia. Electronic address: kim.way@deakin.edu.au. 2. Faculty of Medicine and Health, Discipline of Exercise and Sports Science, University of Sydney, Camperdown, NSW, Australia; The Boden Collaboration for Obesity, Nutrition, Exercise and Eating Disorders, University of Sydney, Camperdown, NSW, Australia; The Charles Perkins Centre, University of Sydney, Camperdown, NSW, Australia. 3. School of Exercise Science, Australian Catholic University, Strathfield, NSW, Australia. 4. Centre for Research on Exercise, Physical Activity and Health, School of Human Movement, and Nutrition Sciences, The University of Queensland, St Lucia, QLD, Australia. 5. School of Health Sciences, University of Newcastle, Ourimbah, NSW, Australia. 6. The Boden Collaboration for Obesity, Nutrition, Exercise and Eating Disorders, University of Sydney, Camperdown, NSW, Australia; The Charles Perkins Centre, University of Sydney, Camperdown, NSW, Australia. 7. The Charles Perkins Centre, University of Sydney, Camperdown, NSW, Australia; Central Clinical School, School of Medicine, University of Sydney, Camperdown, NSW, Australia.
Abstract
BACKGROUND:Low-volume high-intensity interval training (HIIT) may be a time-efficient strategy that leads to similar or superior improvements in cardiorespiratory fitness (CRF) and cardiovascular disease (CVD) risk factors when compared with moderate-intensity continuous training (MICT). Our study investigated the effect of low-volume HIIT or MICT versus sham placebo-control (PLA) on central arterial stiffness, hemodynamic responses, and CVD risk factors in adults with obesity and type 2 diabetes (T2D). METHODS:Eligible participants were previously inactive adults with obesity and T2D. Individuals were randomly allocated to: i) HIIT (1 × 4 min cycling at 90% peak oxygen consumption [V̇O2peak]); ii) MICT (45 min of cycling at 60% VO2peak); or PLA. Training groups exercised thrice weekly for 12 weeks. Central arterial stiffness, hemodynamics and CVD risk factors were assessed at baseline and post-intervention. Analysis of covariance (ANCOVA) was used to examine changes following HIIT, MICT and PLA. RESULTS:Thirty-five participants (age: 55.1 ± 1.4 years, BMI: 36.1 ± 0.8 kg/m2) completed the study. A significant intervention effect was found for changes in pulse wave velocity (PWV) (p = .03), which reduced with HIIT (-0.3 ± 0.9 m/s) and MICT (-0.1 ± 1.1 m/s) but increased with PLA (0.8 ± 1.6 m/s). There was a significant intervention effect for changes in V̇O2peak (p < .01), glycosylated hemoglobin (p = .03), systolic blood pressure (p < .01), and waist circumference (p = .03), which all improved following MICT or HIIT but not PLA; there was no difference between MICT and HIIT. CONCLUSIONS: Twelve minutes of low-volume HIIT per week leads to improvements in central arterial stiffness and cardiovascular health in inactive individuals with obesity and T2D.
RCT Entities:
BACKGROUND: Low-volume high-intensity interval training (HIIT) may be a time-efficient strategy that leads to similar or superior improvements in cardiorespiratory fitness (CRF) and cardiovascular disease (CVD) risk factors when compared with moderate-intensity continuous training (MICT). Our study investigated the effect of low-volume HIIT or MICT versus sham placebo-control (PLA) on central arterial stiffness, hemodynamic responses, and CVD risk factors in adults with obesity and type 2 diabetes (T2D). METHODS: Eligible participants were previously inactive adults with obesity and T2D. Individuals were randomly allocated to: i) HIIT (1 × 4 min cycling at 90% peak oxygen consumption [V̇O2peak]); ii) MICT (45 min of cycling at 60% VO2peak); or PLA. Training groups exercised thrice weekly for 12 weeks. Central arterial stiffness, hemodynamics and CVD risk factors were assessed at baseline and post-intervention. Analysis of covariance (ANCOVA) was used to examine changes following HIIT, MICT and PLA. RESULTS: Thirty-five participants (age: 55.1 ± 1.4 years, BMI: 36.1 ± 0.8 kg/m2) completed the study. A significant intervention effect was found for changes in pulse wave velocity (PWV) (p = .03), which reduced with HIIT (-0.3 ± 0.9 m/s) and MICT (-0.1 ± 1.1 m/s) but increased with PLA (0.8 ± 1.6 m/s). There was a significant intervention effect for changes in V̇O2peak (p < .01), glycosylated hemoglobin (p = .03), systolic blood pressure (p < .01), and waist circumference (p = .03), which all improved following MICT or HIIT but not PLA; there was no difference between MICT and HIIT. CONCLUSIONS: Twelve minutes of low-volume HIIT per week leads to improvements in central arterial stiffness and cardiovascular health in inactive individuals with obesity and T2D.
Authors: Angelo Sabag; Shelley E Keating; Kimberley L Way; Rachelle N Sultana; Sean M Lanting; Stephen M Twigg; Nathan A Johnson Journal: BMC Sports Sci Med Rehabil Date: 2021-04-16
Authors: Elizabeth Wrench; Kate Rattley; Joel E Lambert; Rebecca Killick; Lawrence D Hayes; Robert M Lauder; Christopher J Gaffney Journal: Acta Diabetol Date: 2022-08-05 Impact factor: 4.087