Determinants of exercise intolerance in breast cancer patients prior to anthracycline chemotherapy

Beaudry, Rhys I., Howden, Erin J., Foulkes, Steve, Bigaran, Ashley, Claus, Piet, Haykowsky, Mark J. and Gerche, Andre La 2019, Determinants of exercise intolerance in breast cancer patients prior to anthracycline chemotherapy, Physiological reports, vol. 7, no. 1, doi: 10.14814/phy2.13971.

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Title Determinants of exercise intolerance in breast cancer patients prior to anthracycline chemotherapy
Author(s) Beaudry, Rhys I.
Howden, Erin J.
Foulkes, Steve
Bigaran, Ashley
Claus, Piet
Haykowsky, Mark J.
Gerche, Andre La
Journal name Physiological reports
Volume number 7
Issue number 1
Article ID e13971
Total pages 8
Publisher Wiley
Place of publication Chichester, Eng.
Publication date 2019-01
ISSN 2051-817X
2051-817X
Keyword(s) Breast cancer
VO2
cardiac function
exercise MRI
neoadjuvant
Summary Women with early-stage breast cancer have reduced peak exercise oxygen uptake (peak VO2 ). The purpose of this study was to evaluate peak VO2 and right (RV) and left (LV) ventricular function prior to adjuvant chemotherapy. Twenty-nine early-stage breast cancer patients (mean age: 48 years) and 10 age-matched healthy women were studied. Participants performed an upright cycle exercise test with expired gas analysis to measure peak VO2 . RV and LV volumes and function were measured at rest, submaximal and peak supine cycle exercise using cardiac magnetic resonance imaging. Peak VO2 was significantly lower in breast cancer patients versus controls (1.7 ± 0.4 vs. 2.3 ± 0.5 L/min, P = 0.0013; 25 ± 6 vs. 35 ± 6 mL/kg/min, P = 0.00009). No significant difference was found between groups for peak upright exercise heart rate (174 ± 13 vs. 169 ± 16 bpm, P = 0.39). Rest, submaximal and peak exercise RV and LV end-diastolic and end-systolic volume index, stroke index, and cardiac index were significantly lower in breast cancer patients versus controls (P < 0.05 for all). No significant difference was found between groups for rest and exercise RV and LV ejection fraction. Despite preserved RV and LV ejection fraction, the decreased peak VO2 in early-stage breast cancer patients prior to adjuvant chemotherapy is due in part to decreased peak cardiac index secondary to reductions in RV and LV end-diastolic volumes.
Language eng
DOI 10.14814/phy2.13971
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2019, The Authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30119947

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