Journal of Eexercise & Organ Cross Talk

Physical fitness and frailty index in developing biological age prediction model

Document Type : Original Article

Authors

1 Department of Biological Sciences in Sport, Faculty of Sports Sciences and Health, Shahid Beheshti University, Daneshjoo Blvd., Daneshjoo Sq., Velenjak, Tehran, Iran.

2 Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, School of Medicine, Daneshjoo Blvd., Daneshjoo Sq., Velenjak, Tehran, Iran.

Abstract
The global increase in the older population has resulted in escalating healthcare costs and burdens on governments and families. Understanding biological age (BA) as distinct from chronological age (CA) holds significant potential in accurately assessing individuals' health status and susceptibility to diseases. During exercise, myokines like irisin and lactate are released from skeletal muscles, facilitating cross-talk with organs such as the brain and heart. This may improve physical fitness, reducing frailty and BA. This research aimed to develop a comprehensive BA prediction model integrating genetic and epigenetic factors. The study involved 59 healthy adults, comprising 31 males and 28 females, with average ages of 58.2 ± 7 years and 50.1 ± 8.5 years, respectively. Assessments of physical fitness and completion of the Frailty Index (FI34) questionnaire were conducted to capture genetic and epigenetic influences. Feature selection, principal component analysis (PCA), and multiple linear regression (MLR) were employed to tailor BA prediction models for each gender. We identified seven significant biomarkers for males, including FI34, percent of skeletal muscle mass (SM), handgrip strength (GS), flexibility via sit-and-reach test (SR), peak torque of quadriceps muscles (PTQ), cardiopulmonary fitness (VO2max), and basal metabolic rate (BMR). Conversely, females exhibited six key biomarkers: FI34, SM, GS, waist-to-hip ratio (WHR), peak torque of hamstring muscles (PTH), and percentage of body fat (PBF). We have successfully developed a comprehensive model for estimating BA by integrating key biomarkers representing epigenetic and genetic impacts. Estimating BA is crucial for precise health evaluations and disease risk assessments.

What is already known on this subject?

Several methods including epigenetic clock, measuring telomere length, frailty index and using physical fitness biomarkers have been proposed for estimating BA. Physical fitness biomarkers can measure epigenetic conditions and the ability and functionality of different parts of the body. Conversely, FI34's substantial genetic basis makes it suitable for analyzing healthy aging and longevity, but this index alone may not accurately estimate BA.

 

What this study adds?

This study incorporates both genetic and epigenetic factors, which could enhance BA model's comprehensiveness and applications.

Keywords

Subjects


Acknowledgements

None.

Funding

None of the researchers received financial support.

Compliance with ethical standards

Conflict of interest The authors declare that they have no conflict of interest.

Ethical approval All the research was approved by the ethical committee of the Iran University of Medical Sciences (Ethical code: IR.IUMS.REC.1400.197).

Informed consent Not applicable

Author contributions

Conceptualization: M.G., M.N.; Methodology: M.G., S.A.; Software: S.A.; Validation: M.N; Formal analysis: M.N; Investigation: M.N., A.H.; Resources: M.G., A.H.; Data curation: M.N., S.A.; Writing - original draft: M.G.; Writing - review & editing: M.N., S.A.; Visualization: M.N; Supervision: M.N; Project administration: M.N; Funding acquisition: M.N.

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Volume 4, Issue 2
Spring 2024
Pages 74-85

  • Receive Date 29 March 2024
  • Revise Date 03 June 2024
  • Accept Date 05 June 2024