Behavioural despair test

The behavioural despair test (or Porsolt forced swimming test) is a test, centered on a rodent's response to the threat of drowning, whose result has been interpreted as measuring susceptibility to negative mood. It is commonly used to measure the effectiveness of antidepressants, although significant criticisms of its interpretation have been made.

Method

Animals are subjected to two trials during which they are forced to swim in an acrylic glass cylinder filled with water, and from which they cannot escape. The first trial lasts 15 minutes. Then, after 24-hours, a second trial is performed that lasts 5 minutes. The time that the test animal spends in the second trial without making any movements beyond those required to keep its head above water is measured. This immobility time is decreased by various types of antidepressants and also by electroconvulsive shock. Another common variant of this behavioral test specifically used for mice is conducted only for one trial and lasts six minutes. Modern implementations of the test score swimming and climbing behaviours separately, because swimming behaviour has been shown to be increased by selective serotonin reuptake inhibitors, while climbing behaviour is increased by selective norepinephrine reuptake inhibitors such as desipramine and maprotiline.

Swimming lessons

Swimming lessons is the process of learning to swim. In most countries there is a definition of a number of swimming levels that is reached in the process of the curriculum. The respective certificates of swimming tests are required for further training in aquatic abilities. Many countries have defined a minimum swimming level that children should reach by the end of primary education, in most cases with the help of school swimming classes being part of the normal curriculum.

Children are often given swimming lessons, which serve to develop swimming technique and confidence. Children were traditionally viewed not to be able to swim independently until 4 years of age, but infant swimming lessons are now recommended to prevent drowning.

Infant swimming lessons

The Centers for Disease Prevention and Control recommends swimming lessons for children from 1-4, along with other precautionary measures to prevent drowning. In 2010, the American Academy of Pediatrics reversed its previous position in which it had disapproved of lessons before age 4, indicating that the evidence no longer supported an advisory against early swimming lessons.