体温調節における閉経の役割
閉経前および閉経後の女性の熱ストレスに対する体温調節反応に対するエストロゲンの影響
The frequency and severity of heat waves has increased in the last decades. Older adults (over 65 years) have impaired responses to heat stress making them at increased risk for adverse events. Previous heat waves report that women over 65 experience worse health outcomes than any other age group and age matched men.
Aging and reproductive hormones, specifically estrogen, independently alter responses to heat stress. However, the combined effects of low estrogen following menopause and aging on the response to heat stress are unknown. In this study, the investigators will identify the role of estrogen in pre and post menopausal women on thermoregulatory responses to heat stress.
調査の概要
状態
状態
条件
条件
介入・治療
介入・治療
詳細な説明
Premenopausal and postmenopausal women will be recruited and different interventions will be given to each group. To mimic a postmenopausal hormone profile, premenopausal women will be given a GnRH antagonist, which acutely reduces estrogen concentrations. This induces a temporary post-menopausal state without compounding aging effects. Postmenopausal women will be given a transdermal estradiol patch to acutely raise estrogen concentrations. Supplementing estrogen in postmenopausal women allows for the effect of menopausal low estrogen concentration to be removed from the physiological effects of aging.
Subjects sign an informed consent form and undergo a medical screening prior to participation. The screening includes a physical exam, anthropometry, chemical and lipid profiles.
Each subject will complete 6 (3 for each treatment) experimental trials. For each intervention, participants will complete one passive heating experiment first, followed by two active heating experiments.
研究の種類
研究の種類
入学 (推定)
入学
段階
段階
- フェーズ 4
連絡先と場所
研究連絡先
研究連絡先
- 名前:W. Larry Kenney, Ph.D.
- 電話番号:814-863-1672
- メール:w7k@psu.edu
研究連絡先のバックアップ
- 名前:Olivia K. Leach, MS
- メール:okl5046@psu.edu
研究場所
-
-
Pennsylvania
-
University Park、Pennsylvania、アメリカ、16802
- 募集
- Noll Laboratory
-
コンタクト:
- W. Larry Kenney, Ph.D.
- 電話番号:814-863-1672
- メール:w7k@psu.edu
-
コンタクト:
- Olivia Leach, MS
- メール:okl5046@psu.edu
-
-
参加基準
適格基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria:
- Women ages 42-64
Exclusion Criteria:
- Chron's disease, diverticulitis, or similar gastrointestinal disease
- Abnormal resting exercise electrocardiogram (ECG)
- Tobacco use
- High-risk determined by the Atherosclerotic Cardiovascular Disease (CVD) Risk Factor
- Assessment
- Using hormone therapy
- Using hormonal contraceptives
研究計画
研究はどのように設計されていますか?
デザインの詳細
- 主な目的:基礎科学
- 割り当て:ランダム化
- 介入モデル:クロスオーバー割り当て
- マスキング:ダブル
アーム数
武器と介入
参加者グループ / アーム参加者グループ / アーム |
介入・治療介入・治療 |
|---|---|
|
実験的:Premenopausal estrogen suppression
Participants take a cellulose placebo tablet for 4 days prior to baseline testing and continue until experimental visits are complete. Following completion of placebo testing, participants begin taking 400 mg/day Elagolix for 4 days prior to testing and continue until experimental visits are complete. |
2 x 200 mg tablet
他の名前:
placebo tablet |
|
実験的:Postmenopausal estrogen supplementation
Participants wear a transdermal estradiol patch or placebo patch for 5 days prior to testing and continue until experimental visits are complete. After 48 hr washout, participants then wear the alternative treatment for 5 days prior to testing until experimental visits are complete. |
0.05 mg/day patch placebo patch |
この研究は何を測定していますか?
主要な結果の測定
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Skin Blood Flow
時間枠:Monitored continuously during both 3 hour passive heating experiments (Visit 1 and Visit 3 approx 3 weeks)
|
Skin blood flow response to whole body heating is continuously monitored |
Monitored continuously during both 3 hour passive heating experiments (Visit 1 and Visit 3 approx 3 weeks)
|
|
Local Sweat Rate
時間枠:Monitored continuously during both 3 hour passive heating experiments (Visit 1 and Visit 3 approx 3 weeks)
|
A small sweat capsule is placed on the forearm for the duration of whole body heating. |
Monitored continuously during both 3 hour passive heating experiments (Visit 1 and Visit 3 approx 3 weeks)
|
|
Core Temperature
時間枠:Monitored continuously during all 3 hour experimental visits (6 total average of 3 weeks)
|
Changes in body temperature are measured through a telemetry pill swallowed before each experiment. |
Monitored continuously during all 3 hour experimental visits (6 total average of 3 weeks)
|
二次結果の測定
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Body Mass
時間枠:Baseline and following 3 hr experimental visit (6 total visits for study completion, an average of 3 weeks)
|
Body mass is measured on a scale. |
Baseline and following 3 hr experimental visit (6 total visits for study completion, an average of 3 weeks)
|
|
Skin Temperature
時間枠:Calculated continuously for the duration of each 3 hr experimental visit (6 total visits for study completion, an average of 3 weeks)
|
Mean skin temperature is calculated from a weighted average of skin temperature from 4 different sites. |
Calculated continuously for the duration of each 3 hr experimental visit (6 total visits for study completion, an average of 3 weeks)
|
協力者と研究者
捜査官
捜査官
- 主任研究者:W. Larry Kenney, Ph.D.、The Pennsylvania State University
研究記録日
主要日程の研究
研究開始 (実際)
研究開始
一次修了 (推定)
一次修了
研究の完了 (推定)
研究の完了
試験登録日
最初に提出
最初に提出
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
最初の投稿 (実際)
最初の投稿
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
QC基準を満たした最後の更新が送信されました
QC基準を満たした最後の更新が送信されました
最終確認日
最終確認日
詳しくは
この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。