cron-web.org

[A1CR]

A previous free-full-text-to-all http://tinyurl.com/m5skz
paper had
described how exercise may affect various hormones. The
paper below
describes the effects of exercise versus food restriction on
the fat
tissue-derived http://en.wikipedia.org/wiki/Adiponectin
(which stated:
"Levels of the hormone are inversely correlated with body
mass index (BMI)"]
hormone. The same amount of fat reduction, similar weight
reductions, yet differential adiponectin levels. To try to
explain, the authors thought that the observation that
testosterone was increased by exercise, yet not CR (in many
cases of CR it decreases) may
have provided more adiponectic derived from comparable fat
tissue for the
exercised rats. Could different fat tissues possibly
remaining after the
exercise versus CR also have caused the effects observed?

Kimura M, Shinozaki T, Tateishi N, Yoda E, Yamauchi H,
Suzuki M, Hosoyamada
M, Shibasaki T.

Adiponectin is regulated differently by chronic exercise
than by
weight-matched food restriction in hyperphagic and obese
OLETF rats.
Life Sci. 2006 Jul 12; [Epub ahead of print]
PMID: 16889803 http://tinyurl.com/p8hlm

... Male Otsuka Long Evans Tokushima Fatty (OLETF)
rats (26 weeks old)
were divided to undergo either regular 12-week wheel running
exercise (EX)
or to have food restriction (FR) that resulted in body
weight reduction
similar to that in EX. Both EX and FR induced similar
reductions in body
weight, abdominal fat volume and plasma leptin concentration
compared with
ad libitum control. At the end of the study, although plasma
adiponectin
level was increased in FR, the adiponectin level did not
change in EX.
Plasma testosterone level was higher in EX than in either of
the other two
groups. A significant inverse relationship existed between
plasma levels of
adiponectin and testosterone for all groups. Our results
suggested that
12-week voluntary wheel running exercise induces different
effects on plasma
adiponectin level than does food restriction, despite
similar reduction in
body weight, fat tissue mass and plasma leptin
concentration. We speculate
that the elevated plasma testosterone concentration might
offset any
hyperadiponectinemic effect of body weight and fat volume
reduction in
exercising rats.