apnea

This term describes a suspension of breathing that can be either a pathological symptom or a deliberate physical act. In medical contexts, it often refers to involuntary pauses during sleep, which can lead to oxygen deprivation and fragmented sleep cycles. When used in the context of diving or athletics, it refers to the voluntary suppression of the respiratory drive. Because it describes a physiological state or condition, it is treated as an uncountable noun and does not typically take a plural form in standard medical or athletic discourse.