Randomized controlled trial to evaluate the effects of combined progressive exercise on metabolic syndrome in breast cancer survivors: rationale, design, and methods.
BACKGROUND
Metabolic syndrome (MetS) is increasingly present in breast cancer survivors, possibly worsened by cancer-related treatments, such as chemotherapy. MetS greatly increases risk of cardiovascular disease and diabetes, co-morbidities that could impair the survivorship experience, and possibly lead to cancer recurrence. Exercise has been shown to positively influence quality of life (QOL), physical function, muscular strength and endurance, reduce fatigue, and improve emotional well-being; however, the impact on MetS components (visceral adiposity, hyperglycemia, low serum high-density lipoprotein cholesterol, hypertriglyceridemia, and hypertension) remains largely unknown. In this trial, we aim to assess the effects of combined (aerobic and resistance) exercise on components of MetS, as well as on physical fitness and QOL, in breast cancer survivors soon after completing cancer-related treatments.


METHODS
This study is a prospective randomized controlled trial (RCT) investigating the effects of a 16-week supervised progressive aerobic and resistance exercise training intervention on MetS in 100 breast cancer survivors. Main inclusion criteria are histologically-confirmed breast cancer stage I-III, completion of chemotherapy and/or radiation within 6 months prior to initiation of the study, sedentary, and free from musculoskeletal disorders. The primary endpoint is MetS; secondary endpoints include: muscle strength, shoulder function, cardiorespiratory fitness, body composition, bone mineral density, and QOL. Participants randomized to the Exercise group participate in 3 supervised weekly exercise sessions for 16 weeks. Participants randomized to the Control group are offered the same intervention after the 16-week period of observation.


CONCLUSIONS
This is the one of few RCTs examining the effects of exercise on MetS in breast cancer survivors. Results will contribute a better understanding of metabolic disease-related effects of resistance and aerobic exercise training and inform intervention programs that will optimally improve physiological and psychosocial health during cancer survivorship, and that are ultimately aimed at improving prognosis.


BACKGROUND
NCT01140282;


BACKGROUND
June 10, 2010.
Division of Biokinesiology and Physical Therapy, University of Southern California, 1540 E, Alcazar St, CHP 155, 90089 Los Angeles, CA, USA. cdieli@usc.edu.
Christina M
CM
Dieli-Conwright
Joanne E
JE
Mortimer
E Todd
ET
Schroeder
Kerry
K
Courneya
Wendy
W
Demark-Wahnefried
Thomas A
TA
Buchanan
Debu
D
Tripathy
Leslie
L
Bernstein
D000328:Adult; D001943:Breast Neoplasms / Q000150:complications / Q000473:pathology / Q000628:therapy*; D015444:Exercise; D005260:Female; D006801:Humans; D024821:Metabolic Syndrome / Q000209:etiology / Q000473:pathology / Q000628:therapy*; D008875:Middle Aged; D009367:Neoplasm Staging; D010809:Physical Fitness; D011788:Quality of Life; D055070:Resistance Training; D017741:Survivors; D016896:Treatment Outcome