Phase Angle as a Marker of Muscular Strength in Breast Cancer Survivors

Background: accurate prognostic tools are relevant for decision-making in cancer care. Objective measures, such as bioelectrical impedance (BI), have the potential to improve prognostic accuracy for these patients. This cross-sectional study aimed to investigate whether phase angle (PhA) derived fro...

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Bibliographic Details
Published in:International journal of environmental research and public health 2020-06, Vol.17 (12), p.4452
Main Authors: Matias, Catarina N., Cavaco-Silva, Joana, Reis, Mafalda, Campa, Francesco, Toselli, Stefania, Sardinha, Luís, Silva, Analiza M.
Format: Article
Language:English
Subjects:
Bioelectricity
Breast cancer
Decision making
Edema
Electrical properties
Forearm
Isometric
Lymphedema
Malnutrition
Mortality
Muscle function
Muscle strength
Phase shift
Physical activity
Questionnaires
Regression analysis
Spectroscopy
Statistical analysis
Studies
Surgery
Variables
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Summary:Background: accurate prognostic tools are relevant for decision-making in cancer care. Objective measures, such as bioelectrical impedance (BI), have the potential to improve prognostic accuracy for these patients. This cross-sectional study aimed to investigate whether phase angle (PhA) derived from the electrical properties of the body tissues is a predictor of muscular strength in breast cancer survivors (BCS). Methods: a total of 41 BCS (age 54.6 ± 9.2 years) were evaluated. PhA, obtained at frequency 50 kHz, was assessed with BI spectroscopy, and muscular strength with a handgrip dynamometer. Moderate-to-vigorous physical activity (MVPA) was assessed using the International Physical Activity Questionnaire (IPAQ). Measurements were performed in the morning after an overnight fast. Results: linear regression analysis showed that PhA accounted for 22% (r2 = 0.22) of muscular strength variance. PhA remained a borderline predictor of muscular strength variance independently of age and MVPA. Conclusions: the findings of this study suggest that PhA is a significant predictor of maximal forearm isometric strength and a potential indicator of disease-related functionality in BCS.
ISSN:1660-4601
1661-7827
1660-4601
DOI:10.3390/ijerph17124452