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Voluntary and forced exercise influence the survival and body composition of ageing male rats differently.

Abstract：

:The importance of maintaining physical fitness by engaging in exercise in a life-long perspective as well as the avoidance of obesity has been emphasised in recent years by epidemiological studies on human populations as well as studies on laboratory rodents. In laboratory studies, voluntary running in wheels and forced training in a treadmill have been used with beneficial results. Restriction of the food intake of sedentary laboratory rodents can be regarded either as life prolongation or prevention of life shortening by obesity. We compared the effects of these interventions on male Sprague-Dawley rats from the age of 5 to 23 months in the following groups: (1) RW=voluntary running in wheels; (2) PW=fed to pair weight with RW animals; (3) TM=forced training in a treadmill; and (4) S1=sedentary with ad libitum access to food. Each group consisted of 32 animals, all housed individually in cages. Two RW animals died, five died in each of the PW and S1 groups and 10 in the TM group (p<0.05). The S1 and TM groups gained most weight, the TM less after the age of 21 months (p<0.05). The body weights of the RW group was lower than those of the S1 and TM groups all the time (p<0.001) and the difference increased all the time. Body composition was analysed by bioelectrical impedance analysis. There were no differences in fat free mass (FFM) neither between RW and PW at any time, nor between S1 and TM. FFM was lower for RW and PW compared to S1 and TM. TM gained FFM until the age of 17 months, while S1 gained FFM all the time. S1 gained fat all the time, but the gain for TM levelled off. It stayed constant for RW until 13 months and decreased afterwards. We conclude that voluntary running in wheels enhances survival and keeps body fat lower than in PW animals up to the age of 17 months. Body composition and survival data suggest that voluntary running is more optimal than forced. Care must, however, be taken in analyses, since RW is a heterogenous group because there is a large variation between the animals with respect to how much they run.

journal_name

Exp Gerontol

journal_title

Experimental gerontology

authors

Narath E,Skalicky M,Viidik A

doi

10.1016/s0531-5565(01)00145-0

keywords:

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

1699-711

issue

10

eissn

0531-5565

issn

1873-6815

pii

S0531556501001450

journal_volume

36

pub_type

杂志文章

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