Acute diaphragmatic changes induced by starvation in rats

Area of Science:

• Physiology
• Nutrition Science
• Respiratory Medicine

Background:

• Diaphragmatic function is crucial for respiration.
• Nutritional status can impact skeletal muscle performance.
• The effects of short-term total starvation on respiratory muscles require further investigation.

Purpose of the Study:

• To evaluate the impact of a 4-day total starvation period on diaphragmatic strength and endurance in an in vivo rat model.

Main Methods:

• Twenty-four rats were divided into control and starved groups.
• Diaphragmatic strength and endurance were assessed.
• Body weight and diaphragmatic weight were measured.

Main Results:

• Starvation caused an 18% decrease in body and diaphragmatic weight compared to controls.
• Diaphragmatic contractility was impaired in the starved group.
• A significant reduction in transdiaphragmatic pressure was observed across most stimulation frequencies, but not when normalized for muscle mass.

Conclusions:

• A 4-day total fast leads to reduced diaphragmatic weight.
• This weight reduction is associated with decreased diaphragmatic strength and endurance capacity.
• Fasting negatively impacts respiratory muscle function.