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Effects of aging and exercise traini...

Spier, Scott Alan.

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Effects of aging and exercise training on endothelium-dependent vasodilation of skeletal muscle arterioles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effects of aging and exercise training on endothelium-dependent vasodilation of skeletal muscle arterioles./
作者:	Spier, Scott Alan.
面頁冊數:	63 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3764.
Contained By:	Dissertation Abstracts International64-08B.
標題:	Health Sciences, Pharmacology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3102508

Effects of aging and exercise training on endothelium-dependent vasodilation of skeletal muscle arterioles.
Spier, Scott Alan.

Effects of aging and exercise training on endothelium-dependent vasodilation of skeletal muscle arterioles. - 63 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3764.

Thesis (Ph.D.)--Texas A&M University, 2003.

Aging reduces endothelium-dependent vasodilation in both humans and animals. In humans, exercise training reverses the aging-associated reduction in endothelium-dependent vasodilation. However, the mechanism(s) through which these alterations occur have not been established. The purpose of this study was to determine the mechanism(s) by which exercise training enhances endothelium-dependent vasodilation in arterioles from muscles of differing fiber composition in young and old rats. One hundred and eight Fischer 344 rats, ages 3- and 22-months old, were assigned to either a young <italic>sedentary</italic> (young SED, n = 25), young <italic>exercise-trained</italic> (young ET, n = 31), old <italic>sedentary </italic> (old SED, n = 28), or old <italic>exercise-trained</italic> (old ET, n = 24) group. Exercise-trained groups ran on a treadmill 60 min/d at 15 m/min (15° incline), 5 d/wk for 10–12 wk. 1A arterioles were isolated from the soleus and superficial gastrocnemius muscles of each animal. Luminal diameter changes were determined in response to graded increases in intraluminal flow at constant intraluminal pressure and to acetylcholine (ACh, 10<super>−9</super> − 10<super>−4</super>M), an endothelium-dependent vasodilator. Responses to flow and ACh were then determined in the presence of nitric oxide synthase (NOS) inhibition (L-NAME, 10<super>−5</super> M), cyclooxygenase (COX) inhibition (Indomethacin, 10<super>−5</super> M), or combination NOS (L-NAME, 10<super>−5</super> M) plus COX (Indomethacin, 10<super>−5</super> M) inhibition. Aging reduced flow-induced vasodilation, and these age-associated reductions were eliminated by NOS inhibition in soleus muscle arterioles and COX inhibition in gastrocnemius muscle arterioles. ACh-mediated vasodilation was reduced only in soleus muscle arterioles of aged rats, and these reductions were abolished with NOS inhibition. Exercise training ameliorated the aging-induced reduction in endothelium-dependent vasodilation to flow and ACh in soleus muscle arterioles and to flow in gastrocnemius muscle arterioles. NOS blockade and the combined NOS plus COX blockade abolished the training-induced enhancement of flow-mediated vasodilation in arterioles from both muscles of aged rats and the training-induced enhancement of ACh-mediated vasodilation in arterioles from soleus muscle of aged rats. These data demonstrate that exercise training can restore old age-associated reductions in endothelium-dependent vasodilation, and that this restoration occurs through a nitric oxide mechanism in both the soleus and gastrocnemius muscles.Subjects--Topical Terms:

1017717
Health Sciences, Pharmacology.

Effects of aging and exercise training on endothelium-dependent vasodilation of skeletal muscle arterioles.
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245 1 0 $a Effects of aging and exercise training on endothelium-dependent vasodilation of skeletal muscle arterioles.
300 $a 63 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3764.
500 $a Chair: Michael D. Delp.
502 $a Thesis (Ph.D.)--Texas A&M University, 2003.
520 $a Aging reduces endothelium-dependent vasodilation in both humans and animals. In humans, exercise training reverses the aging-associated reduction in endothelium-dependent vasodilation. However, the mechanism(s) through which these alterations occur have not been established. The purpose of this study was to determine the mechanism(s) by which exercise training enhances endothelium-dependent vasodilation in arterioles from muscles of differing fiber composition in young and old rats. One hundred and eight Fischer 344 rats, ages 3- and 22-months old, were assigned to either a young <italic>sedentary</italic> (young SED, n = 25), young <italic>exercise-trained</italic> (young ET, n = 31), old <italic>sedentary </italic> (old SED, n = 28), or old <italic>exercise-trained</italic> (old ET, n = 24) group. Exercise-trained groups ran on a treadmill 60 min/d at 15 m/min (15° incline), 5 d/wk for 10–12 wk. 1A arterioles were isolated from the soleus and superficial gastrocnemius muscles of each animal. Luminal diameter changes were determined in response to graded increases in intraluminal flow at constant intraluminal pressure and to acetylcholine (ACh, 10<super>−9</super> − 10<super>−4</super>M), an endothelium-dependent vasodilator. Responses to flow and ACh were then determined in the presence of nitric oxide synthase (NOS) inhibition (L-NAME, 10<super>−5</super> M), cyclooxygenase (COX) inhibition (Indomethacin, 10<super>−5</super> M), or combination NOS (L-NAME, 10<super>−5</super> M) plus COX (Indomethacin, 10<super>−5</super> M) inhibition. Aging reduced flow-induced vasodilation, and these age-associated reductions were eliminated by NOS inhibition in soleus muscle arterioles and COX inhibition in gastrocnemius muscle arterioles. ACh-mediated vasodilation was reduced only in soleus muscle arterioles of aged rats, and these reductions were abolished with NOS inhibition. Exercise training ameliorated the aging-induced reduction in endothelium-dependent vasodilation to flow and ACh in soleus muscle arterioles and to flow in gastrocnemius muscle arterioles. NOS blockade and the combined NOS plus COX blockade abolished the training-induced enhancement of flow-mediated vasodilation in arterioles from both muscles of aged rats and the training-induced enhancement of ACh-mediated vasodilation in arterioles from soleus muscle of aged rats. These data demonstrate that exercise training can restore old age-associated reductions in endothelium-dependent vasodilation, and that this restoration occurs through a nitric oxide mechanism in both the soleus and gastrocnemius muscles.
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