What is a consequence of short-term "swim failure" during Cold Water Immersion?

Short-term "swim failure" during cold water immersion is primarily characterized by the loss of muscle control and grip strength due to the effects of hypothermia and cold shock. When the body is suddenly exposed to cold water, it undergoes a rapid physiological response that can lead to the inability to swim effectively. This includes a significant reduction in hand grip strength as the body diverts blood flow away from the extremities to preserve core temperature, resulting in decreased muscle function in the hands. Consequently, individuals may find it increasingly difficult to grasp onto objects or keep themselves afloat.

The other choices do not accurately describe the consequences associated with cold water immersion. For example, a sudden increase in heart rate is a common immediate response, but it does not directly relate to swim failure. Improved movement speed is counterintuitive, as cold water can impair motor control and reaction time. Similarly, increased body temperature is contrary to what occurs; cold water leads to a drop in body temperature, exacerbating the risks associated with hypothermia and swim failure.