The effects of fatness and fat distribution on respiratory functions
Slawomir Koziel1, Stanley J Ulijaszek, Alicja Szklarska
1Institute of Anthropology, Polish Academy of Sciences, Kuznicza 35, 50-951 Wroclaw, Poland. slawek@antro.pan.wroc.pl
Annals of Human Biology
|June 1, 2007
Summary
Obesity impacts lung function differently in men and women. Abdominal and chest fat affect male respiratory health, while upper body fat is key for females.
Area of Science:
- Pulmonary Medicine
- Obesity Research
- Cardiorespiratory Health
Background:
- Inverse relationships between obesity indices and respiratory function are documented.
- Specific measures of obesity and their differential impact on lung function remain unclear.
Purpose of the Study:
- To assess the influence of overall fatness and regional fat distribution on respiratory function.
- To investigate sex-specific effects of obesity on lung capacity.
Main Methods:
- A cross-sectional study of 423 males and 509 females aged 40-50 years.
- Multiple regression analysis evaluated the impact of height, Body Mass Index (BMI), Waist-to-Hip Ratio (WHR), and skinfolds on Forced Vital Capacity (FVC) and Forced Expiratory Volume in 1-second (FEV1).
Main Results:
- In males, FVC and FEV1 were positively associated with height and BMI. Abdominal and subscapular skinfolds, and WHR negatively impacted FVC.
- In females, FVC and FEV1 showed positive associations with height and negative associations with subscapular skinfold. WHR and abdominal skinfolds had no significant association.
- Male respiratory function was similarly affected by abdominal and chest fat; female respiratory function was most strongly related to thoracic fat.
Conclusions:
- Fatness generally impairs respiratory function, with distinct patterns in males and females.
- In males, abdominal (subcutaneous and visceral) and chest fat significantly affect respiratory function.
- In females, upper thoracic subcutaneous fat has the most substantial impact on respiratory function, with minimal influence from abdominal fat.
Related Concept Videos
01:24Factors Affecting Respiration
Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
01:19Factors Affecting Pulmonary Ventilation
Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
01:25Pharmacokinetics in Obese Patients: Drug Absorption and Distribution
Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
01:27Physiology of Respiration I: Functions of the Respiratory System
The respiratory system is crucial for exchanging oxygen (O2) and carbon dioxide (CO2) between the atmosphere and the bloodstream, maintaining the body's balance. Beyond gas exchange, it helps regulate acid-base balance, purify inhaled air, and enable vocalization.
Fundamental Processes in Respiration:
Fundamental Processes in Respiration:
01:24Pressure Relationships in Thoracic Cavity
Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
01:24Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features
Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...