Determinants of exercise intensity achieved during exercise prehabilitation program for patients awaiting cardiac surgery
Refereed conference paper presented and published in conference proceedings

Full Text

Other information
AbstractOBJECTIVES: This is a sub-study of an ongoing randomised controlled trial, PREQUEL (ChiCTR1800016098) which examines the effect of a hospital-based exercise prehabilitation program. The objective was to evaluate the most relevant determinants of the exercise intensity achieved by the participants in the cardiac prehabilitation program.

METHODS: This exercise prehabilitation program, supervised by a physiotherapist, was performed at a university hospital in Hong Kong. Multiple regression was performed to examine the potential determinants affecting exercise intensity achieved, including (i) age, gender; (ii) frailty level, presence of cardiovascular risk factors; and (iii) prehabilitation-related factors: length of time available for prehabilitation before surgery, and total number of training sessions on the average and maximum exercise intensity achieved by pre-frail and frail patients (Clinical Frailty Scale [CFS 4-6]) during prehabilitation between July 2018 and September 2020. We estimated the proportion of total variance explained by the model (R2) and the relative importance of each factor using the “rego” package for STATA software.

RESULTS: Of the 29 participants (8 females, 21 males), 3 were frail (CFS 5) and 26 were pre-frail (CFS 4). The median (IQR) prehabilitaiton duration was 7 weeks (5-11 weeks), and number of training sessions was 7 (6-12). The median (IQR) of the average and maximum exercise intensity achieved by participants during the prehabilitation period was 71% (57%-93%) and 112% (83%-146%) of baseline predicted peak oxygen consumption reserve (VO2Rbaseline) respectively. The multiple regression model for average exercise intensity accounted for 48% of the total variance, with the greatest relative contributions provided by the length of time (≥8 weeks) for training available (48%), and total number of training sessions (≥8 sessions) completed (23%) (Table 1). Similar results were found for the maximum exercise intensity model.

CONCLUSION: The training time available, rather than age, gender, frailty, cardiovascular risk factors, and the number of sessions completed before surgery was the significant factor associated with the exercise intensity achieved.
Acceptance Date16/11/2020
All Author(s) ListDerek King Wai YAU, Malcolm John UNDERWOOD, Gavin Matthew JOYNT, Anna LEE
Name of Conference8th Asian Preventive Cardiology and Cardiac Rehabilitation Conference
Start Date of Conference28/11/2020
End Date of Conference29/11/2020
Place of ConferenceHong Kong
Country/Region of ConferenceHong Kong
Proceedings TitleJournal of the Hong Kong College of Cardiology
LanguagesEnglish-United Kingdom
KeywordsCardiac surgery, Preoperative rehabilitation

Last updated on 2021-18-02 at 11:02