TY - JOUR
T1 - Predictors of supervised exercise adherence during breast cancer chemotherapy
AU - Courneya, Kerry S.
AU - Segal, Roanne J.
AU - Gelmon, Karen
AU - Reid, Robert D.
AU - Mackey, John R.
AU - Friedenreich, Christine M.
AU - Proulx, Caroline
AU - Lane, Kirstin
AU - Ladha, Aliya B.
AU - Vallance, Jeffrey K.
AU - Mckenzie, Donald C.
PY - 2008
Y1 - 2008
N2 - Purpose: Exercise adherence is difficult during cancer' treatments, but few studies have examined the predictors of such exercise. Here, we report the predictors of adherence to supervised exercise training during breast cancer chemotherapy. Methods: Breast cancer patients (N = 242) initiating adjuvant chemotherapy in Edmonton, Ottawa, and Vancouver were randomly assigned to usual care (N = 82), supervised resistance exercise (n = 82), or supervised aerobic exercise (n = 78) for the duration of their chemotherapy. Baseline data on standard demographic, medical, behavioral, fitness, and psychosocial variables as well as motivational variables from the Theory of Planned Behavior were collected. Adherence was assessed by objective attendance records. Results: Adherence to supervised exercise was 70.2%. Univariate analyses indicated significant or borderline significant associations between exercise adherence and location/center (r = 0.30; P < 0.001), V̇O 2peak (r = 0.21; P = 0.008), muscular strength (r = 0.21; P = 0.008), percent body fat (r = -0.21; P = 0.012), disease stage (r = 0.17; P = 0.031), education (r = 0.15; P = 0.053), depression (r = -0.14; P = 0.073), and smoking (r = -0.14; P = 0.081). In multivariate analysis, location/center (β = 0.28; P = 0.001), V̇O 2pcak (β = 0.19; P = 0.016), disease stage (β = 0.18; P = 0.015), and depression (β = -0.16; P = 0.033) remained significant and explained 21% of the variance in exercise adherence. Participants in Vancouver, with higher aerobic fitness, more advanced disease stage, and lower depression, achieved better adherence. Conclusion: Adherence to supervised exercise training was predicted by unique aspects of the location/center, disease stage, aerobic fitness, and depression but not motivational variables. Location/center in our trial may have been a proxy for the amount of one-on-one attention received during supervised exercise. These findings may have implications for improving adherence during breast cancer chemotherapy.
AB - Purpose: Exercise adherence is difficult during cancer' treatments, but few studies have examined the predictors of such exercise. Here, we report the predictors of adherence to supervised exercise training during breast cancer chemotherapy. Methods: Breast cancer patients (N = 242) initiating adjuvant chemotherapy in Edmonton, Ottawa, and Vancouver were randomly assigned to usual care (N = 82), supervised resistance exercise (n = 82), or supervised aerobic exercise (n = 78) for the duration of their chemotherapy. Baseline data on standard demographic, medical, behavioral, fitness, and psychosocial variables as well as motivational variables from the Theory of Planned Behavior were collected. Adherence was assessed by objective attendance records. Results: Adherence to supervised exercise was 70.2%. Univariate analyses indicated significant or borderline significant associations between exercise adherence and location/center (r = 0.30; P < 0.001), V̇O 2peak (r = 0.21; P = 0.008), muscular strength (r = 0.21; P = 0.008), percent body fat (r = -0.21; P = 0.012), disease stage (r = 0.17; P = 0.031), education (r = 0.15; P = 0.053), depression (r = -0.14; P = 0.073), and smoking (r = -0.14; P = 0.081). In multivariate analysis, location/center (β = 0.28; P = 0.001), V̇O 2pcak (β = 0.19; P = 0.016), disease stage (β = 0.18; P = 0.015), and depression (β = -0.16; P = 0.033) remained significant and explained 21% of the variance in exercise adherence. Participants in Vancouver, with higher aerobic fitness, more advanced disease stage, and lower depression, achieved better adherence. Conclusion: Adherence to supervised exercise training was predicted by unique aspects of the location/center, disease stage, aerobic fitness, and depression but not motivational variables. Location/center in our trial may have been a proxy for the amount of one-on-one attention received during supervised exercise. These findings may have implications for improving adherence during breast cancer chemotherapy.
KW - Cancer survivors
KW - Determinants
KW - Physical activity
KW - Randomized controlled trial
UR - http://www.scopus.com/inward/record.url?scp=54049083071&partnerID=8YFLogxK
U2 - 10.1249/MSS.0b013e318168da45
DO - 10.1249/MSS.0b013e318168da45
M3 - Journal Article
C2 - 18460985
AN - SCOPUS:54049083071
SN - 0195-9131
VL - 40
SP - 1180
EP - 1187
JO - Medicine and Science in Sports and Exercise
JF - Medicine and Science in Sports and Exercise
IS - 6
ER -