Which breathing technique is primarily used to facilitate deeper breathing?

Breath stacking is a technique specifically designed to enhance lung capacity and facilitate deeper breathing. This technique involves inhaling to full capacity and then taking additional short breaths without exhaling fully in between, essentially "stacking" breaths. This method is effective for increasing lung volumes and improving ventilation, particularly in individuals with restrictive lung conditions.

By using breath stacking, the individual can access the alveoli that may not have been engaged during normal breathing patterns. Deeper breathing helps to improve gas exchange, promote better oxygenation of the blood, and enhance overall respiratory function. This is particularly beneficial for patients with conditions such as chronic obstructive pulmonary disease (COPD) or other scenarios where lung expansion is compromised.

In contrast, coughing is more about clearing secretions rather than facilitating deeper breathing. Vibrations can help with secretion mobilization but do not primarily aim to deepen breath. Postural drainage is used to assist with draining secretions from specific lung segments and indirectly assists with breathing but isn't primarily focused on enhancing the depth of breaths. Therefore, among the choices provided, breath stacking is the most directly applicable technique for achieving deeper breathing.