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Relationship between Heart Rate Variability and Functional Fitness in Breast Cancer Survivors: A Cross-Sectional
Alexandre D Martins1,2, João Paulo Brito1,2,3, Rafael Oliveira1,2,3
1Institute of Santarém, Sports Science School of Rio Maior-Polytechnic, 2140-413 Rio Maior, Portugal.
Background:
Breast cancer is the most common malignancy among women worldwide. The treatments may also cause neuromuscular and skeletal disorders; therefore, the aim of this study was to verify the existence of a relationship between heart rate variability and different functional fitness parameters in women survivors of breast cancer.
Methods:
This cross-sectional study included 25 women survivors of breast cancer, with a mean ± SD age, height, and body mass of 50.8 ± 8.8 years, 1.6 ± 0.7 m, and 67.1 ± 12.3 kg, respectively. Patients underwent measurements of heart rate variability with time and frequency domain analyses, as well as a "30 s chair-stand test", "6 min walking test", "timed up and go test", and "ball throwing test".
Results:
A multiple linear regression analysis showed that from the heart rate variability frequency domain, high frequency explained 21% (R2 = 0.21) of the "30 s chair-stand test" performance.
Conclusion:
The findings of this study highlight high frequency as a predictor of "30 s chair-stand test" performance, regardless of age and time after diagnosis, suggesting its usefulness as a clinical indicator of functionality in breast cancer survivors. This study presents a straightforward and non-invasive methodology predicting functional fitness in women breast cancer survivors potentially applicable to clinical practice.
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