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Cardiovascular Risk in Sedentary Elderly During Prolonged Sitting Time Versus Intermittent Sitting Time

2. September 2016 aktualisiert von: Eduardo Ferriolli, University of Sao Paulo

Blood Glucose, Insulin Response and Inflammatory Markers in Sedentary Elderly During Prolonged Sitting Time Versus Intermittent Sitting Time

In adults, the sedentary behavior was related to cardiovascular risk markers, regardless of the level of physical activity (PA). However, the interruption of prolonged sedentary time has shown positive results even when performed in breaks of low intensity and short duration of activity. The aim of this study is to analyze the influence of a sedentary uninterrupted period, as well as different forms of breaks in sedentary time for the glycemic, insulin and inflammatory markers responses in older adults. This is a controlled clinical trial to be conducted in older (≥ 65 years) and sedentary (<150 min / week of moderate to vigorous physical activity) people. Those with BMI ≥ to 35.00 kg /m2; diabetic, on medication for glycemic control, or with absolute or relative contraindications to PA practice will not be included . Participants will undergo four phases of intervention separated by an interval of 7 days: (1) Prolonged Sitting Time(PST), in which older people will stay for 5 hours seated; (2) Prolonged sitting with PA of light intensity and short duration (LiSd), time sitting is interrupted for PA bouts of 50-60% of the Heart Rate (HR)max; (3) Prolonged sitting with PA of moderate intensity and short duration (MiSd), time sitting will be interrupted for PA bouts of 65-75% predicted HR max; (4) Prolonged sitting with PA of moderate intensity and long duration (MiLd,) time sitting will be interrupted with PA bouts of 65-75% of HRmax. PA bouts will be performed by walking into a hallway every 20 minutes of sitting time and will last 2 minutes, except in MiLd phase (10 minute breaks every 75 minutes). To evaluate the effects of different PA interruptions in plasma glucose, serum insulin and inflammatory markers, blood samples will be collected serially (-30min, Baseline and 30min, 1h, 2h, 3h, 4h and 5h after a standardized meal. It is expect that interruption of sedentary time, even with breaks of short duration and light intensity can bring benefits to cardiovascular risk markers even in the elderly.

Studienübersicht

Status

Unbekannt

Bedingungen

Intervention / Behandlung

Studientyp

Interventionell

Einschreibung (Voraussichtlich)

16

Phase

  • Unzutreffend

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienorte

  • Brasilien
    • São Paulo
      • Ribeirão Preto, São Paulo, Brasilien, 14048-900
        • Rekrutierung
        • Clinics Hospital of the Ribeirao Preto Medical School

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

65 Jahre und älter (Älterer Erwachsener)

Akzeptiert gesunde Freiwillige

Ja

Studienberechtigte Geschlechter

Weiblich

Beschreibung

Inclusion Criteria:

  • Sedentary older women according World Health Organization, defined as not performing moderate to vigorous physical activity and vigorous for 150 min / week for at least 3 months;
  • BMI <to 35.00 kg / m2;
  • Sign the Informed Consent.

Exclusion Criteria:

  • Previous diagnosis of Diabetes Mellitus;
  • Use of any medication for glycemic control;
  • Orthopedic problems that impair walking or use of orthoses for walking.
  • Relative or absolute contraindications to perform physical activity.

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

  • Zuteilung: Zufällig
  • Interventionsmodell: Parallele Zuordnung
  • Maskierung: Keine (Offenes Etikett)

Waffen und Interventionen

Teilnehmergruppe / Arm
Intervention / Behandlung
Experimental: Prolonged Sitting Time (PST)
Uninterrupted sitting time of 5 hours
Sonstiges: Prolonged sitting time
Volunteers will be continuously sitting on a chair for 5 hours and should move the least possible. If the participant needs to stand from the chair, the stage will be invalidated.
Experimental: PST+Light intensity Short bouts PA
Sitting prolonged interrupted with breaks of 2 minutes of light physical activity
Sonstiges: PST+Light intensity Short bouts PA
Volunteers will have their time sitting interrupted every 20 minutes for 2 minutes of physical activity of low intensity. In the active period, participants will be encouraged to walk in the hallway and reach a training heart rate between 50-60% HR max predicted for the age and measured by heart rate monitor. The Borg scale will be used at the beginning and the end of each active period in order to measure the subjective effort of the participants. In the end the volunteers will be sitting 5 hours and have 30 minutes (15 bouts of 2 minutes) of light intensity physical activity.
Experimental: PST+Moderate intensity Short bouts PA
Sitting prolonged interrupted with breaks of 2 minutes of moderate physical activity
Sonstiges: PST+Moderate intensity Short bouts PA
Volunteers will have their time sitting interrupted every 20 minutes for 2 minutes of physical activity of moderate intensity. In the active period, participants will be encouraged to walk in the hallway and reach a training heart rate between 65 a 75% HR max predicted for the age and measured by heart rate monitor. The Borg scale will be used at the beginning and the end of each active period in order to measure the subjective effort of the participants. In the end the volunteers will be sitting 5 hours and have 30 minutes (15 bouts of 2 minutes)of moderate intensity physical activity.
Experimental: PST+Moderate intensity Long bouts PA
Sitting prolonged interrupted with breaks of 10 minutes of moderate physical activity
Sonstiges: PST+Moderate intensity Long bouts PA
Volunteers will have their time sitting interrupted every 75 minutes for 10 minutes of physical activity of moderate intensity. In the active period, participants will be encouraged to walk in the hallway and reach a training heart rate between 65 a 75% HR max predicted for the age and measured by heart rate monitor. The Borg scale will be used at the beginning and the end of each active period in order to measure the subjective effort of the participants. In the end the volunteers will be sitting 5 hours and have 30 minutes (3 bouts of 10 minutes) of moderate intensity physical activity.

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Change in blood glucose area under curve during 5 hours in four different phases of intervention
Zeitfenster: 4 weeks
Assessed by serial blood sampling.The first blood sampling is performed 30 minutes before ingestion of a standard meal mixed solution composed of carbohydrate, fat and protein. The collection of serial blood will be collected in time (-30min, Baseline, 30min, 1h, 2h, 3h, 4h and 5h after the meal). The results will be expressed in mg.dl.
4 weeks
Change in insulin area under curve during 5 hours in four different phases of intervention
Zeitfenster: 4 weeks
Assessed by serial blood sampling. The first blood sampling is performed 30 minutes before ingestion of a standard meal mixed solution composed of carbohydrate, fat and protein. The collection of serial blood will be collected in time (-30min, Baseline, 30min, 1h, 2h, 3h, 4h and 5h after the meal).The results will be expressed in µIU/ml.
4 weeks

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Assessment of physical performance
Zeitfenster: 1 day
The physical performance will be evaluated by the Short Physical Performance Battery test.
1 day
Assessment of handgrip strength
Zeitfenster: 1 day
Measure of handgrip strength with a manual dynamometer (Saehan)
1 day
Assessment of muscle strength of knee extensors
Zeitfenster: 1 day
Measure of muscle strength of the lower limbs (knee extension) with a isokinetic dynamometer (Biodex 4 Pro)
1 day
Physical Activity behaviour
Zeitfenster: 7 days
use of a tri-axial accelerometer to measure profile of spontaneous physical activity
7 days
Change in Inflammatory Cytokines area under curve during 5 hours in four different phases of intervention
Zeitfenster: 4 weeks
Assessed by serial blood sampling. The first sampling is performed 30 minutes before ingestion of a standard meal mixed solution composed of carbohydrate, fat and protein. The collection of serial blood will be collected in time (-30min, Baseline, 30min, 1h, 2h, 3h, 4h and 5h after the meal).
4 weeks

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

University of Sao Paulo

Ermittler

  • Hauptermittler: Eduardo Ferriolli, PhD, USao Paulo

Publikationen und hilfreiche Links

Die Bereitstellung dieser Publikationen erfolgt freiwillig durch die für die Eingabe von Informationen über die Studie verantwortliche Person. Diese können sich auf alles beziehen, was mit dem Studium zu tun hat.

Allgemeine Veröffentlichungen

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn

1. August 2015

Primärer Abschluss (Voraussichtlich)

1. Dezember 2016

Studienabschluss (Voraussichtlich)

1. Dezember 2016

Studienanmeldedaten

Zuerst eingereicht

26. Juli 2016

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

2. September 2016

Zuerst gepostet (Schätzen)

9. September 2016

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Schätzen)

9. September 2016

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

2. September 2016

Zuletzt verifiziert

1. August 2016

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Schlüsselwörter

Andere Studien-ID-Nummern

  • 1563/2015

Plan für individuelle Teilnehmerdaten (IPD)

Planen Sie, individuelle Teilnehmerdaten (IPD) zu teilen?

NEIN

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