PTH And Calcium Responses to Exercise (PACE) in Older Adults
12. marts 2018 opdateret af: University of Colorado, Denver
Exercise that causes a decline in serum Calcium (Ca) as a result of dermal Ca loss stimulates bone resorption via an increase in Parathyroid Hormone (PTH).
Studieoversigt
Status
Afsluttet
Betingelser
Intervention / Behandling
Detaljeret beskrivelse
Determine whether the magnitude of dermal Ca loss (i.e., sweating) during exercise is a determinant of the decline in iCa and increases in PTH and carboxy-terminal collagen crosslinks (CTX; marker of bone resorption).
The proposed experiment will address this by manipulating the rate of dermal Ca loss (moderate vs high sweating rate) to determine whether this is the trigger for the cascade described in Figure 1.
This will be achieved by having participants perform two identical exercise bouts under different thermal conditions (warm vs cool).
Undersøgelsestype
Interventionel
Tilmelding (Faktiske)
12
Fase
- Ikke anvendelig
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
-
-
Colorado
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Aurora, Colorado, Forenede Stater, 80045
- University of Colorado Hospital
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-
Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
60 år til 80 år (Voksen, Ældre voksen)
Tager imod sunde frivillige
Ingen
Køn, der er berettiget til at studere
Alle
Beskrivelse
Inclusion Criteria:
- Healthy adults aged 60-80 y
Exclusion Criteria:
- Use of medications in the past 6 months known to affect bone metabolism (e.g., bisphosphonates, thiazide diuretics, oral glucocorticoids)
- BMD t score < -2.5 at the total hip or lumbar spine
- Known disease or condition associated with intestinal malabsorption
- Moderate or severe renal impairment defined as an estimated glomerular filtration rate of <60 mL/min/1.73m2 based on the MDRD equation
- Chronic hepatobiliary disease, defined as liver function tests (AST, ALT) >1.5 times the upper limit of normal; if such values are obtained on initial screening and thought to be transient in nature, repeated testing will be allowed
- Thyroid dysfunction, defined as an ultrasensitive TSH <0.5 or >5.0 mU/L; volunteers with abnormal TSH values will be re-considered for participation in the study after follow-up evaluation by the PCP with initiation or adjustment of thyroid hormone replacement
- Serum calcium <8.5 or >10.3 mg/dL
- Serum 25(OH)D <20 ng/mL; volunteers with abnormal serum 25(OH)D values may be re-considered for participation in the study if serum 25(OH)D is >20 ng/mL after vitamin D supplementation
- Uncontrolled hypertension defined as resting systolic BP >150 mmHg or diastolic BP>90 mmHg; participants who do not meet these criteria at first screening will be re-evaluated, including after follow-up evaluation by the PCP with initiation or adjustment of anti-hypertensive medications
- History of type 1 or type 2 diabetes
- Cardiovascular disease; subjective or objective indicators of ischemic heart disease (e.g., angina, ST segment depression) or serious arrhythmias at rest or during the graded exercise test (GXT) without follow-up evaluation will be cause for exclusion; follow-up evaluation must include diagnostic testing (e.g., stress echocardiogram or thallium stress test) with interpretation by a cardiologist
- Diagnosis or history of asthma
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Forebyggelse
- Tildeling: Randomiseret
- Interventionel model: Crossover opgave
- Maskning: Ingen (Åben etiket)
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
|---|---|
|
Aktiv komparator: Treadmill Exercise
2 (two) 1-hour of vigorous exercise bouts under different thermal conditions, one at 16 degrees C and one at 26 degrees C.
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2 (two) 1-hour of vigorous exercise bouts under different thermal conditions
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Eksperimentel: Magnitude of Ca loss during Exercise at 26 degrees Celcius
Blood samples at 15-min intervals starting 15 min before exercise and ending 60 min after exercise.
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Blood samples at 15-min intervals starting 15 min before exercise and ending 60 min after exercise
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Change in Parathyroid Hormone (PTH)
Tidsramme: 60 minutes of exercise and 2 hours of recovery
|
PTH will be measured during baseline, throughout exercise, and during recovery at regular intervals.
We are looking to see how PTH changes over the course of the exercise and recovery period in both the warm and cool conditions.
We anticipate that PTH will be higher in the warm condition versus the cool.
We expect that men and women will respond similarly.
|
60 minutes of exercise and 2 hours of recovery
|
|
Change C-Telopeptide (CTX)
Tidsramme: 60 minutes of exercise and 2 hours of recovery
|
CTX will be measured during baseline, throughout exercise, and during recovery at regular intervals.
We are looking to see how PTH changes over the course of the exercise and recovery period in both the warm and cool conditions.
We anticipate that CTX will be higher during exercise and recovery in the warm condition versus the cool.
|
60 minutes of exercise and 2 hours of recovery
|
|
Change in Serum Ionized Calcium (iCa)
Tidsramme: 60 minutes of exercise
|
iCa will be measured during baseline, throughout exercise, and during recovery at regular intervals.
We are looking to see how PTH changes over the course of the exercise and recovery period in both the warm and cool conditions.
We expect that serum iCa will be higher in the cool condition versus the warm.
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60 minutes of exercise
|
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Change in Total Ca
Tidsramme: 60 minutes of exercise
|
Total Ca will be measured during baseline, throughout exercise, and during recovery at regular intervals.
We are looking to see how PTH changes over the course of the exercise and recovery period in both the warm and cool conditions.
|
60 minutes of exercise
|
Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Sponsor
Efterforskere
- Ledende efterforsker: Sarah J Wherry, PhD, University of Colorado, Denver
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart
1. august 2015
Primær færdiggørelse (Faktiske)
1. juni 2017
Studieafslutning (Faktiske)
1. januar 2018
Datoer for studieregistrering
Først indsendt
2. juni 2015
Først indsendt, der opfyldte QC-kriterier
8. juni 2015
Først opslået (Skøn)
11. juni 2015
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
14. marts 2018
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
12. marts 2018
Sidst verificeret
1. marts 2018
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 15-0250
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