Abstract
Objective
To characterize the relationship between 1-repetition maximum (1-RM) bench press strength
and isometric handgrip strength among breast cancer survivors.
Design
Cross-sectional study.
Setting
Laboratory.
Participants
Community-dwelling breast cancer survivors (N=295).
Interventions
Not applicable.
Main Outcome Measure
1-RM bench press strength was measured with a barbell and exercise bench. Isometric
handgrip strength was measured using an isometric dynamometer, with 3 maximal contractions
of the left and right hands. All measures were conducted by staff with training in
clinical exercise testing.
Results
Among 295 breast cancer survivors, 1-RM bench press strength was 18.2±6.1kg (range,
2.2–43.0kg), and isometric handgrip strength was 23.5±5.8kg (range, 9.0–43.0kg). The
strongest correlate of 1-RM bench press strength was the average isometric handgrip
strength of both hands (r=.399; P<.0001). Mean difference analysis suggested that the average isometric handgrip strength
of both hands overestimated 1-RM bench press strength by 4.7kg (95% limits of agreement,
−8.2 to 17.6kg). In a multivariable linear regression model, the average isometric
handgrip strength of both hands (β=.31; P<.0001) and age (β=−.20; P<.0001) were positively correlated with 1-RM bench press strength (R2=.23).
Conclusions
Isometric handgrip strength is a poor surrogate for 1-RM bench press strength among
breast cancer survivors. 1-RM bench press strength and isometric handgrip strength
quantify distinct components of muscular strength.
Keywords
List of abbreviations:
BMI (body mass index), CI (confidence interval), PAL (Physical Activity and Lymphedema), 1-RM (1-repetition maximum)To read this article in full you will need to make a payment
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Article Info
Publication History
Published online: August 16, 2016
Footnotes
Supported by the National Cancer Institute (grant no. R01-CA106851).
Clinical Trial Registration No.: NCT00194363.
Disclosures: none.
Identification
Copyright
© 2016 by the American Congress of Rehabilitation Medicine
