The impact of high-intensity interval training exercise on breast cancer survivors: a pilot study to explore fitness, cardiac regulation and biomarkers of the stress systems

Author: Kellie Toohey1,2,3,4, Kate Pumpa5,6, Andrew McKune5,6,7,8, Julie Cooke5,6, Marijke Welvaert5,9, Joseph Northey5,6, Clare Quinlan5,6, Stuart Semple5,6,10,7
Affiliation:
1 Research Institute for Sport and Exercise, University of Canberra, Canberra, 2601, Australia. kellie.toohey@canberra.edu.au.
2 Discipline of Sport and Exercise Science, Faculty of Health, University of Canberra, Canberra, 2601, Australia. kellie.toohey@canberra.edu.au.
3 Health Research Institute, University of Canberra, Canberra, 2601, Australia. kellie.toohey@canberra.edu.au.
4 Prehabilitation, Activity, Cancer, Exercise and Survivorship (PACES) Research Group, University of Canberra, Canberra, 2601, Australia. kellie.toohey@canberra.edu.au.
5 Research Institute for Sport and Exercise, University of Canberra, Canberra, 2601, Australia.
6 Discipline of Sport and Exercise Science, Faculty of Health, University of Canberra, Canberra, 2601, Australia.
7 Prehabilitation, Activity, Cancer, Exercise and Survivorship (PACES) Research Group, University of Canberra, Canberra, 2601, Australia.
8 School of Health Sciences, University of KwaZulu-Natal, Durban, 400, South Africa.
9 Statistical Consulting Unit, Australian National University, Canberra, 2600, Australia.
10 Health Research Institute, University of Canberra, Canberra, 2601, Australia.
Conference/Journal: BMC Cancer
Date published: 2020 Aug 20
Other: Volume ID: 20 , Issue ID: 1 , Pages: 787 , Special Notes: doi: 10.1186/s12885-020-07295-1. , Word Count: 296

Background:
Cardiovascular disease (CVD) remains the largest cause of death in breast cancer survivors. The aim of this study was to explore the impact of exercise intensity on aerobic fitness and autonomic cardiac regulation (heart rate variability (HRV)) and salivary biomarkers of the stress systems (HPA-axis, cortisol; sympathetic nervous system, α-amylase) and mucosal immunity (secretory(s)-IgA), markers of increased risk of CVD in breast cancer survivors.

Methods:
Participants were randomly assigned to; 1) high intensity interval training (HIIT); 2) moderate-intensity, continuous aerobic training (CMIT); or 3) a wait-list control (CON) for a 12-week (36 session) stationary cycling intervention. Cardiorespiratory fitness (VO2peak), resting HRV and salivary biomarkers were measured at baseline 2-4 d pre-intervention and 2-4 d post the last exercise session.

Results:
Seventeen participants were included in this study (62 ± 8 years, HIIT; n = 6, CMIT; n = 5, CON; n = 6). A significant improvement (p ≤ 0.05) was observed for VO2peak in the HIIT group; 19.3% (B = 3.98, 95%CI = [1.89; 4.02]) and a non-significant increase in the CMIT group; 5.6% (B = 1.96, 95%CI = [- 0.11; 4.03]), compared with a 2.6% (B = - 0.64, 95%CI = [- 2.10; 0.82]) decrease in the CON group. Post intervention improvements in HRV markers of vagal activity (log (ln)LF/HF, LnRMSSD) and sympathetic nervous system (α-amylase waking response) occurred for individuals exhibiting outlying (> 95% CI) levels at baseline compared to general population.

Conclusion:
High intensity interval training improved cardiovascular fitness in breast cancer survivors and improved cardiac regulation, and sympathetic nervous system (stress) responses in some individuals. High-intensity interval training was safe and effective for breast cancer survivors to participate in with promising results as a time efficient intensity to improve physical health and stress, reducing CVD risk.

Trial registration:
This pilot study was retrospectively registered through the Australian New Zealand Clinical Trials Registry (ANZCTR): ACTRN12620000684921 .

Keywords: Biomarkers; Cancer; Exercise; Health; High-intensity; Immune function; Stress.

PMID: 32819304 DOI: 10.1186/s12885-020-07295-1

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