Denna sida har översatts automatiskt och översättningens korrekthet kan inte garanteras. Vänligen se engelsk version för en källtext.

PTH And Calcium Responses to Exercise (PACE) in Older Adults

12 mars 2018 uppdaterad av: 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).

Studieöversikt

Status

Avslutad

Betingelser

Intervention / Behandling

Detaljerad beskrivning

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).

Studietyp

Interventionell

Inskrivning (Faktisk)

12

Fas

  • Inte tillämpbar

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

  • Förenta staterna
    • Colorado
      • Aurora, Colorado, Förenta staterna, 80045
        • University Of Colorado Hospital

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

60 år till 80 år (Vuxen, Äldre vuxen)

Tar emot friska volontärer

Nej

Kön som är behöriga för studier

Allt

Beskrivning

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

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Förebyggande
  • Tilldelning: Randomiserad
  • Interventionsmodell: Crossover tilldelning
  • Maskning: Ingen (Open Label)

Vapen och interventioner

Deltagargrupp / 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.
Procedur: Treadmill Exercise
2 (two) 1-hour of vigorous exercise bouts under different thermal conditions
Experimentell: 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.
Procedur: 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

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Change in Parathyroid Hormone (PTH)
Tidsram: 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)
Tidsram: 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)
Tidsram: 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.
60 minutes of exercise
Change in Total Ca
Tidsram: 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

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

University of Colorado, Denver

Utredare

  • Huvudutredare: Sarah J Wherry, PhD, University of Colorado, Denver

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart

1 augusti 2015

Primärt slutförande (Faktisk)

1 juni 2017

Avslutad studie (Faktisk)

1 januari 2018

Studieregistreringsdatum

Först inskickad

2 juni 2015

Först inskickad som uppfyllde QC-kriterierna

8 juni 2015

Första postat (Uppskatta)

11 juni 2015

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

14 mars 2018

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

12 mars 2018

Senast verifierad

1 mars 2018

Mer information

Termer relaterade till denna studie

Nyckelord

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • 15-0250

Denna information hämtades direkt från webbplatsen clinicaltrials.gov utan några ändringar. Om du har några önskemål om att ändra, ta bort eller uppdatera dina studieuppgifter, vänligen kontakta register@clinicaltrials.gov. Så snart en ändring har implementerats på clinicaltrials.gov, kommer denna att uppdateras automatiskt även på vår webbplats .

Prenumerera