Abstract
Purpose
We examined whether physical activity measured at starting point and its trajectory over time were simultaneously associated with vital prognosis.
Methods
This retrospective cohort study included 295 ambulatory maintenance hemodialysis patients (mean age 63.9 years; 54.6% male). We measured physical activity at index date (starting point) and its change over 1 year as predictors, and all-cause death and cardiovascular events were assessed as the outcomes. Two groups each of high versus low physical activity at starting point (based on 4000 steps per day) and no decline versus decline (based on a predicted mean slope) were created. Cox proportional-hazards regression and Fine–Gray proportional sub-distribution hazards model were used to examine associations between physical activity and its trajectory and clinical outcomes.
Results
Decline in physical activity over 1 year was associated with a higher risk of all-cause death and cardiovascular events, irrespective of the physical activity at starting point. Furthermore, both lower physical activity at starting point and decrease in physical activity over time were independently associated with a higher risk of all-cause death and cardiovascular events in models in which each exposure was mutually adjusted. Compared to other groups that worsened in either exposure, the lowest risk for death/cardiovascular events was observed in the high at starting point/no decline over time group.
Conclusions
Both physical activity at starting point and its change over time were independently associated with vital prognosis. The assessment of both exposures provides additional prognostic information for the assessment of each exposure.
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Data availability
The data underlying this article cannot be shared publicly due to the privacy of individuals that participated in the study. The data will be shared upon reasonable request to the corresponding author.
Code availability
The data will be shared upon reasonable request to the corresponding author.
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Funding
This work was supported by the Japan Society for the Promotion of Science KAKENHI [Grant number: 26350631] with no restriction on publication.
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YS, RM, KH, and AM designed the study. YS, RM, MH, SY, KI, KK, and AM collected the data. YS, RM, KH, YK, and AM analyzed the data. YS, RM, KH, YK, and AM wrote the manuscript. All authors revised the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Institutional Review Board/Ethics Committee of the Kitasato University Allied Health Sciences.
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Suzuki, Y., Matsuzawa, R., Hoshi, K. et al. Physical activity and its trajectory over time and clinical outcomes in hemodialysis patients. Int Urol Nephrol 54, 2065–2074 (2022). https://doi.org/10.1007/s11255-021-03098-w
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DOI: https://doi.org/10.1007/s11255-021-03098-w