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Breaking-up Sedentary Time and 2 Weeks Detraining

NCT04142346 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 14

Last updated 2019-10-30

No results posted yet for this study

Summary

Regularly interrupting sedentary behavior (SB) with activity breaks may attenuate postprandial glucose (PPG) excursions and improve glycemic control. The investigators aimed to determine the effect of interrupting 7 hours of prolonged sitting with brief bouts of moderate physical activity (PA) (alternating between up/down stairs and sit/stand up from the chair) on postprandial glucose (PPG) responses in comparison with uninterrupted sitting. In addition, the investigators aimed to examine the effects of 2 weeks of detraining (DT) on PPG on both protocols. Non-diabetic, trained older adults (n = 15) will be recruited for a randomized crossover trial with two treatments performed in two different training conditions: 1) uninterrupted sitting protocol (CON); 2) seated with 2-minutes bouts of moderate PA every 30 minutes (INT). Both protocols will be performed in a trained condition and after 2 weeks of DT. In the early morning of each trial, participants will do an oral glucose tolerance test (OGTT) and 2 blood samples will be collected (fasting and after 2 hours); 2.5 hours after, participants will begin the protocol and two standardized meals will be provided (0 hours and at 3 hours). An iPro2 continuous glucose monitoring (CGM) system will record the average interstitial glucose concentration every 5 minutes. Positive incremental area under the curve (iAUC) and total area under the curve (pAUC) for glucose as well as mean glucose (MG) will be calculated using Matlab. Differences between both protocols and between the two different moments will be examined using generalized estimation equation (GEE), adjusting for sex and age (CI 95%).

Conditions

  • Old Age

Interventions

BEHAVIORAL

Sitting + moderate intensity breaks

Participants will be followed in a randomized crossover trial undertaken at Faculty of Human Kinetics between April and August 2019. Participants will attend to the laboratory on twelve separate occasions: visit 1 (day 1), baseline assessments for body composition; visit 2 (day 2), cardiorespiratory fitness assessment; visit 3 (day 3), OGTT and the first randomized experimental protocol; visit 4 (day 4), follow-up OGTT; visit 5 (4-6 days after the first experimental protocol), OGTT and the remaining experimental protocol; visit 6 (day following the previous experimental protocol), follow-up OGTT. An additional 6 visits will be performed following the same rational, after a 2-week period of detraining, where participants will be instructed to refrain from structured exercise. The follow-up assessments for body composition and cardiorespiratory fitness will be accomplished after the protocols.

Sponsors & Collaborators

  • Associação Protectora dos Diabéticos de Portugal

    collaborator UNKNOWN

  • University of Lisbon

    lead OTHER

Principal Investigators

  • Luis Sardinha, PhD · Professor

Study Design

Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Model
CROSSOVER

Eligibility

Min Age
65 Years
Max Age
90 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2019-04-01
Primary Completion
2019-08-31
Completion
2019-08-31

Countries

  • Portugal

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04142346 on ClinicalTrials.gov