Kraemer, Blair, McCaferty and Castracane (1993) Running-induced alterations in growth hormone, prolactin, triiodothyronine, and thyroxine concentrations in trained and untrained men and women

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Running-induced alterations in growth hormone, prolactin, triiodothyronine, and thyroxine concentrations in trained and untrained men and women

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CONTRIBUTORS:

	Author:	Kraemer, R. R. (Southeastern Louisiana University)
	Author:	Blair, M. S.
	Author:	McCaferty, R.
	Author:	Castracane, V. D.

JOURNAL:

Research Quarterly for Exercise and Sport (RQES), 64(1), 69 - 74.

YEAR:

1993

PUB TYPE:

Journal Article

SUBJECT(S):

running; training; somatotropin; adaptation; prolactin; thyroxine; triiodothyronine; sex-factor; comparative-study

DISCIPLINE:

No discipline assigned

HTTP:

https://secure.sportquest.com/su.cfm?articleno=314243&title=314243

LANGUAGE:

English

PUB ID:

103-342-259 (Last edited on 2003/02/16 20:24:15 US/Mountain)

SPONSOR(S):

ABSTRACT:
This study examined whether gender and/or training were related to the exercise-induced changes in plasma concentrations of growth hormone (GH), prolactin (PRL), triiodothyronine (T3), and thyroxine (T4). Twenty subjects (male and female 10-km runners; untrained males and females) ran on a treadmill for 30 min at 80 percent of previously determined maximaum heart rate. Blood samples were taken through an indwelling catheter from an antecubital vein at minus 30, 0, plus 15, plus 30 min of the test and 30 min of recovery. Rectal temperature rose significantly (p is less than .01) at plus 15 and plus 30 min with concomitant rise in GH concentration, but PRL, T3, and T4 were not affected by the exercise. We concluded that a 30-min run at 80 percent of maximum heart rate is associated with higher concentrations of GH but not of PRL, T3, and T4. Neither training state nor gender affected the aforementioned results.

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