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Effects of heavy resistance exercise...

Ratamess, Nicholas Angelo, Jr.

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Effects of heavy resistance exercise volume on post-exercise androgen receptor content in resistance-trained men.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of heavy resistance exercise volume on post-exercise androgen receptor content in resistance-trained men./
Author:	Ratamess, Nicholas Angelo, Jr.
Description:	137 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3608.
Contained By:	Dissertation Abstracts International64-08B.
Subject:	Biology, Animal Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3101710

Effects of heavy resistance exercise volume on post-exercise androgen receptor content in resistance-trained men.
Ratamess, Nicholas Angelo, Jr.

Effects of heavy resistance exercise volume on post-exercise androgen receptor content in resistance-trained men. - 137 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3608.

Thesis (Ph.D.)--The University of Connecticut, 2003.

The purpose of the present investigation was to examine the acute hormonal response in the blood and androgen receptor content in the vastus lateralis muscle following two resistance exercise protocols consisting of different volume. Nine men with resistance training experience [7.9 ± 3.9 years; one-repetition maximum (1 RM) squat = 152.2 ± 32.3 kg] performed the squat exercise for 1 (SS) and 6 sets (MS) of 10 repetitions with 80–85% of 1 RM in a random, counter-balanced order separated by one week. Muscle biopsies were performed at baseline (10 days prior to the first protocol), and 1 hour following each protocol. Blood was collected prior to, immediately following (IP), and every 15 minutes after each protocol for 1 hour. Both protocols resulted in significant reductions in plasma volume (SS = −15.6 ± 3.3%, MS = −21.6 ± 3.1%) and elevations in lactate (SS = 6.3 ± 2.9 mmol · L<super>−1</super>; MS = 15.7 ± 3.6 mmol · L<super>−1</super>) at IP with the magnitude of increase significantly greater following MS. For serum total testosterone, no acute elevations were observed following SS whereas significant elevations were observed at IP (16%), 15 (23%), and 30 (18%) min post exercise following MS. For plasma cortisol, no differences were observed for SS over time except for a reduction at 60 min post exercise whereas significant elevations were observed for MS at IP (31%), 15 (48%), and 30 (49%) min post exercise. For the free androgen index (ratio of total testosterone to sex hormone-binding globulin), significant reductions were observed at IP and 45 min post exercise following SS whereas only trends for elevations were observed at 15 and 30 min post exercise following MS. Androgen receptor content did not change 1 hour following SS but significantly decreased by 46% following MS. These results demonstrated that the volume of resistance exercise significantly affected the acute metabolic and hormonal responses. In addition, the higher volume of resistance exercise resulted in a reduction in androgen receptor content in skeletal muscle 1 hour post exercise possibly due to greater protein catabolism associated with the higher level of stress.Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

Effects of heavy resistance exercise volume on post-exercise androgen receptor content in resistance-trained men.
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100 1 $a Ratamess, Nicholas Angelo, Jr. $3 1945341
245 1 0 $a Effects of heavy resistance exercise volume on post-exercise androgen receptor content in resistance-trained men.
300 $a 137 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3608.
500 $a Adviser: William J. Kraemer.
502 $a Thesis (Ph.D.)--The University of Connecticut, 2003.
520 $a The purpose of the present investigation was to examine the acute hormonal response in the blood and androgen receptor content in the vastus lateralis muscle following two resistance exercise protocols consisting of different volume. Nine men with resistance training experience [7.9 ± 3.9 years; one-repetition maximum (1 RM) squat = 152.2 ± 32.3 kg] performed the squat exercise for 1 (SS) and 6 sets (MS) of 10 repetitions with 80–85% of 1 RM in a random, counter-balanced order separated by one week. Muscle biopsies were performed at baseline (10 days prior to the first protocol), and 1 hour following each protocol. Blood was collected prior to, immediately following (IP), and every 15 minutes after each protocol for 1 hour. Both protocols resulted in significant reductions in plasma volume (SS = −15.6 ± 3.3%, MS = −21.6 ± 3.1%) and elevations in lactate (SS = 6.3 ± 2.9 mmol · L<super>−1</super>; MS = 15.7 ± 3.6 mmol · L<super>−1</super>) at IP with the magnitude of increase significantly greater following MS. For serum total testosterone, no acute elevations were observed following SS whereas significant elevations were observed at IP (16%), 15 (23%), and 30 (18%) min post exercise following MS. For plasma cortisol, no differences were observed for SS over time except for a reduction at 60 min post exercise whereas significant elevations were observed for MS at IP (31%), 15 (48%), and 30 (49%) min post exercise. For the free androgen index (ratio of total testosterone to sex hormone-binding globulin), significant reductions were observed at IP and 45 min post exercise following SS whereas only trends for elevations were observed at 15 and 30 min post exercise following MS. Androgen receptor content did not change 1 hour following SS but significantly decreased by 46% following MS. These results demonstrated that the volume of resistance exercise significantly affected the acute metabolic and hormonal responses. In addition, the higher volume of resistance exercise resulted in a reduction in androgen receptor content in skeletal muscle 1 hour post exercise possibly due to greater protein catabolism associated with the higher level of stress.
590 $a School code: 0056.
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Health Sciences, Recreation. $3 1018003
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710 2 0 $a The University of Connecticut. $3 1249323
773 0 $t Dissertation Abstracts International $g 64-08B.
790 1 0 $a Kraemer, William J., $e advisor
790 $a 0056
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3101710