What stage of Cold Water Immersion involves initial "cold shock"?

The initial "cold shock" response occurs during the first stage of cold water immersion. This stage is characterized by a sudden and involuntary reaction to the cold water, which can include gasping, hyperventilation, and increased heart rate. During this phase, individuals often experience an overwhelming sensation of cold that can lead to panic if they have not been properly trained to handle such situations.

Understanding cold shock is crucial for individuals who may find themselves in situations involving cold water, as it emphasizes the importance of maintaining composure to avoid dangerous reactions like drowning during this critical phase. The later stages of cold water immersion involve other physiological responses but do not encompass the immediate shock that defines the initial stage.