Medical research

New data outline positive effects of endurance exercise training

Treadmill training, a form of endurance exercise, was found to be highly effective "with robust improvements in skeletal muscle citrate synthase activity in as little as [one to two] weeks, and improvements in maximum run ...

Genetics

Body-wide molecular map explains why exercise is so good for you

Exercise—it's associated with increased muscle strength, improved heart health, lower blood sugar and just about every other physical improvement you can name. But how does regularly puffing away on a treadmill, biking ...

Psychology & Psychiatry

Chronic stress during adolescence may reduce fertility in adulthood

Male rats exposed to moderate and repeated stress during adolescence may have reduced fertility, according to research presented at the 26th European Congress of Endocrinology, held 11-14 May, in Stockholm. This study sheds ...

Rat

50 species

Stenomys Thomas, 1910

Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus. Many members of other rodent genera and families are also called rats and share many characteristics with true rats.

Rats are typically distinguished from mice by their size; rats are generally large muroid rodents, while mice are generally small muroid rodents. The muroid family is very large and complex, and the common terms rat and mouse are not taxonomically specific. Generally, when someone discovers a large muroid, its common name includes the term rat, while if it is small, the name includes the term mouse - scientifically, the terms are not confined to members of the Rattus and Mus genera. Compare the taxonomic classification of the Pack rat and Cotton mouse.

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