Analysis of Respiratory Muscles Density in Different Age Groups Using CT Scans

Area of Science:

• Medical Imaging
• Gerontology
• Pulmonology

Background:

• Quantitative methods for assessing respiratory muscle density are currently lacking.
• Sarcopenia, an age-related loss of muscle mass and strength, affects respiratory function.
• Computed Tomography (CT) imaging offers potential for non-invasive muscle density assessment.

Purpose of the Study:

• To quantitatively assess respiratory muscle density using CT imaging in adults without diagnosed sarcopenia.
• To investigate age-related changes in the density distributions of key respiratory muscles.
• To explore the influence of Body Mass Index (BMI) on respiratory muscle density.

Main Methods:

• CT images were analyzed from young, middle-aged, and elderly adults without known sarcopenia.
• Muscle density (Hounsfield units) was extracted for pectoralis major, pectoralis minor, intercostal, and serratus muscles.
• Jensen-Shannon divergence was used to compare density distributions across age groups and BMI categories.

Main Results:

• Respiratory muscle density showed significant age-related changes, including decreased mean, median, and kurtosis, and increased standard deviation.
• Density distributions varied more between different age groups than between individuals with different BMIs within the same age group.
• BMI appeared to have a marginal effect on respiratory muscle density compared to age.

Conclusions:

• Age significantly impacts respiratory muscle density, providing a basis for quantitative assessment.
• These findings support future research into sarcopenia detection in respiratory muscles.
• This methodology could aid in the clinical management of patients with chronic respiratory diseases.