Effects of exercise therapy dosing schedule on impaired cardiorespiratory fitness in patients with primary breast cancer: A randomized controlled trial Journal Article

Authors: Scott, J. M.; Thomas, S. M.; Peppercorn, J. M.; Herndon, J. E. 2nd; Douglas, P. S.; Khouri, M. G.; Dang, C. T.; Yu, A. F.; Catalina, D.; Ciolino, C.; Capaci, C.; Michalski, M. G.; Eves, N. D.; Jones, L. W.
Article Title: Effects of exercise therapy dosing schedule on impaired cardiorespiratory fitness in patients with primary breast cancer: A randomized controlled trial
Abstract: BACKGROUND: Current exercise guidelines for clinical populations recommend an exercise therapy (ET) prescription of fixed intensity (moderate), duration (40-50 minutes per session), and volume (120-160 min/wk). A critical overarching element of exercise programming that has received minimal attention is dose scheduling. We investigated the tolerability and efficacy of 2 exercise training dose regimens on cardiorespiratory fitness and patient-reported outcomes in patients with posttreatment primary breast cancer. METHODS: Using a parallel-group randomized trial, we randomly allocated 174 postmenopausal patients (2.8 years after adjuvant therapy) with impaired peak oxygen consumption (VO2peak) to 1 of 2 supervised exercise training interventions delivered with a standard linear (LET) (fixed dose intensity per session for 160 min/wk) or nonlinear (NLET) (variable dose intensity per session for ≈120 min/wk) schedule compared with a stretching attention control group for 16 consecutive weeks. Stretching was matched to exercise dosing arms on the basis of location, frequency, duration, and treatment length. The primary end point was change in VO2peak (mL O2·kg-1·min-1) from baseline to after intervention. Secondary end points were patient-reported outcomes, tolerability, and safety. RESULTS: No serious adverse events were observed. Mean attendance was 64%, 75%, and 80% for attention control, LET, and NLET, respectively. In intention-to-treat analysis, VO2peak increased 0.6±1.7 mL O2·kg-1·min-1 (P=0.05) and 0.8±1.8 mL O2·kg-1·min-1 (P=0.07) in LET and NLET, respectively, compared with attention control. Change in VO2peak ranged from -2.7 to 4.1 mL O2·kg-1·min-1 and from -3.6 to 5.1 mL O2·kg-1·min-1 in LET and NLET, respectively. Approximately 40% of patients in both exercise dosing regimens were classified as VO2peak responders (ie, Δ ≥1.32 mL O2·kg-1·min-1). NLET improved all patient-reported outcomes compared with attention control. CONCLUSIONS: Short-term exercise training, independently of dosing schedule, is associated with modest improvements in cardiorespiratory fitness in patients previously treated for early-stage breast cancer. CLINICAL TRIAL REGISTRATION: URL: https://www.clinicaltrials.gov. Unique identifier: NCT01186367.
Keywords: exercise; breast neoplasms; cardiorespiratory fitness
Journal Title: Circulation
Volume: 141
Issue: 7
ISSN: 0009-7322
Publisher: Lippincott Williams & Wilkins  
Date Published: 2020-02-18
Start Page: 560
End Page: 570
Language: English
DOI: 10.1161/circulationaha.119.043483
PUBMED: 32065769
PROVIDER: scopus
PMCID: PMC7032604
Notes: Article -- Export Date: 2 March 2020 -- Source: Scopus
Citation Impact
MSK Authors
  1. Chau Dang
    236 Dang
  2. Anthony Yu
    68 Yu
  3. Lee Winston Jones
    150 Jones
  4. Cristi Ann Carroll
    11 Carroll
  5. Jessica M Scott
    39 Scott
  6. Catherine Capaci
    6 Capaci