Time-restricted Eating and High-intensity Interval Training for Metabolic Health in Adults With Overweight/Obesity

Norwegian University of Science and Technology100 enrolled

Overview

This study will investigate the effects of 12 months periodised time-restricted eating combined with high-intensity interval training compared with a control group on fat mass in adults with overweight/obesity. Participants in the intervention group will complete the intervention remotely and will receive follow-up by telephone. Before randomisation, after 6 months and after 12 months, the investigators will measure the participants' body composition, physical fitness, fasting blood glucose and insulin, blood lipids, and blood pressure. Physical activity, diet, sleep quality, appetite, and adherence to the intervention will also be measured. Secondary sub-analyses of sex differences in the responses to the intervention will be performed.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

100

Conditions

Overweight and Obesity

Interventions

1-month intense periods of maximal daily eating window of 10 hours and high-intensity interval training (three weekly, unsupervised, aerobic exercise sessions performed at \> 90 % heart rate maximum), separated by 3-month maintenance periods of time-restricted eating on 5 days per week and minimum 1 HIIT session per week. Each exercise session will last for 33-38 minutes. Participants will receive digital follow-up once weekly during intense periods, and once monthly during maintenance periods. The intervention period will be 12 months in total.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 50 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Body mass index ≥ 27 kg/m² * Able to walk or ride a bike \> 60 min Exclusion Criteria: * On-going pregnancy * Lactation within 24 weeks of study commencement * High-intensity exercise ≥ 1/week * Habitual eating window ≤12 hours/day * Taking hypertension, glucose-, or lipid-lowering drugs * Body mass variation ≥ 4 kg three months prior to study commencement * Known diabetes mellitus (type 1 or 2) or cardiovascular disease * Working night shifts

Outcomes

Primary Outcomes

Total fat mass

Change in total fat mass measured with bioelectrical impedance analysis

Time frame: From baseline to after 12 months