- ICH GCP
- 미국 임상 시험 레지스트리
- 임상시험 NCT00100451
Aging, Exercise, and Hormonal Influences of Fat Metabolism
연구 개요
상세 설명
The physiologic cause(s) of the age-related increase in total body and abdominal fat mass are not well-understood. The purpose of this study is to determine whether aging is associated with decreased whole body lipolytic and other metabolic responses to epinephrine and insulin, whether these responses may be augmented by exercise training or in older women by estrogen administration and to investigate whether such metabolic changes are related to reductions in abdominal adiposity. Our objectives in this project are as follows: (1) to characterize age and gender differences in lipolysis and other aspects of metabolism at rest and during graded dose epinephrine infusion with or without a pancreatic islet clamp in healthy non-obese men and women aged 20-40 and 55-75 years, (2) to evaluate relationships between metabolic responses to epinephrine or insulin and portally and nonportally-drained visceral and subcutaneous adipose tissue mass in these individuals, (3) to delineate the effects of acute and chronic exercise on lipolytic and other metabolic responses to epinephrine and insulin and on adipose tissue distribution in healthy younger and older men and women, and (4) to investigate whether 7 days and 12 months or estrogen and cyclic progesterone replacement therapy or placebo in healthy 55-75 year old women alter lipolytic and other metabolic responses to epinephrine and insulin and adipose tissue distribution.
The rates of lipolysis, oxygen uptake, fat and carbohydrate oxidation, and total triglyceride-free fatty acid (FFA) substrate cycling will be determined by indirect calorimetry and by gas chromatography-mass spectrometric analyses of blood samples obtained during infusions of the stable isotope tracers [D5] glycerol and [1 -13C] palmitate in the baseline state, during a pancreatic islet clamp in half of all male and female participants, and in all participants during a subsequent 4-stage graded dose epinephrine infusion. These data will be expressed in relation to total body wieght, fat mass, and fat-free mass, assessed from measurements of body density made by hydrostatic weighing. Adipose tissue distribution will be characterized by determination of the cross-sectional area and volume of portally and nonportally-drained visceral and subcutaneous fat deposits identified by radiographic density criteria on computed tomographic scans obtained at the level of the nipple, umbilicus, gluteal region, and midthigh. Insulin action on glucose disposal will be assessed during a hyperinsulinemic euglycemic clamp. Age and gender differences and their interactions with exercise and the plasma epinephrine concentration in the baseline state and during submaximally and maximally stimulating rates of epinephrine infustion will be evaluated by analysis of variance and covariance. Relationships between effects of estrogen treatment or exercise of adipose tissue distribution and responses to epinephrine and insulin will be assessed by multiple regression analysis.
We hypothesize that increased age will be associated with lower epinephrine-induced rates of lipolysis, fat oxidation, and triglyceride-FFA substrate cycling and decreased insulin action in both men and women when expressed in relation to total fat mass. We further hypothesize that these age-related differences will be at least partly ameliorated by exercise training and by treatment with estrogen in conjunction with a decrease in visceral abdominal and total body adiposity.
연구 유형
단계
- 해당 없음
연락처 및 위치
연구 장소
-
-
Missouri
-
St. Louis, Missouri, 미국, 63125
- VA Medical Center
-
-
참여기준
자격 기준
공부할 수 있는 나이
건강한 자원 봉사자를 받아들입니다
연구 대상 성별
설명
- Healthy men or women between the ages of 20 and 75
공부 계획
연구는 어떻게 설계됩니까?
디자인 세부사항
- 주 목적: 치료
공동 작업자 및 조사자
연구 기록 날짜
연구 주요 날짜
연구 시작
연구 완료
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (추정)
연구 기록 업데이트
마지막 업데이트 게시됨 (추정)
QC 기준을 충족하는 마지막 업데이트 제출
마지막으로 확인됨
추가 정보
이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .
exercise에 대한 임상 시험
-
University of TorontoUniversity Health Network, Toronto; University of Western Ontario, Canada; Institute for... 그리고 다른 협력자들완전한
-
The Hong Kong Polytechnic University완전한
-
University of Maryland, BaltimoreNational Institute on Aging (NIA)완전한