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NCT Number: NCT07603141

Workplace Intervention Including Exercise and Nutrition in Obese Office Workers

The main objective of this study is to investigate the efficacy of a 6-month workplace combined (exercise and nutrition) intervention in obese office workers, using a randomized controlled study. An additional objective of this study is to evaluate the individual responses per participant following the program.

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Key information

Conditions

Obesity (BMI>30) Behavior Behavior, Animal Body Weight Feeding Behavior Motor Activity Nutrition Disorders Nutritional and Metabolic Diseases Obesity Overnutrition Overweight Pathological Conditions, Signs and Symptoms Signs and Symptoms

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Department of Physical Education and Sports Science, University of Thessaly

Trikala, Greece, 42100

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Sedentary work at least 8 h per day in the office
  • BMI value ≥ 30 kg/m2
  • No chronic diseases (physical or mental)
  • No use of any medication
  • No injuries (in lower or upper body) in the last 6 months
  • No participation in organized exercise programs or nutrition intervention during the last 6 months.

Exclusion criteria

Participants who do not meet the above criteria will be excluded from the study.

Treatment and study plan

Workplace combined (exercise and nutrition) intervention

Other

The IG will participate in a supervised 6-month combined intervention program (exercise and nutrition), which will take place inside the workplace settings during working hours. In more detail, the IG will participate, every working day (5 days/week), in a 6-month supervised combined chair-based exercise program (120 training sessions; 25-40 min/day), including chair based seated and chair-assisted standing exercises to improve flexibility, balance, strength and aerobic capacity. Except exercise, the intervention program consisted of weekly counseling and educational activities in healthy diet and proper hydration using presentations, leaflets, individual and group sessions with nutritionist, use of applications for proper hydration, use of goal-setting cards for healthy options

Primary outcomes

  1. Body fat

    Time frame: Baseline and 6 months

    Body fat (BF): BF% will be assessed using the bioelectrical impedance method (Maltron 900).

  2. Body circumferences

    Time frame: Baseline and 6 months

    The waist and hip circumferences will be measured using an ergonomic circumference measuring tape (Seca 201).

  3. Blood pressure

    Time frame: Baseline and 6 months

    Systolic and diastolic blood pressure will be measured, using an electronic upper arm blood pressure monitor (A&D-UA-851).

  4. Respiratory function

    Time frame: Baseline and 6 months

    Forced vital capacity (FVC) and forced expiratory volume in 1 s (FEV1) will be measured, using a portable spirometer (Micro, Medical, Micro).

  5. Lipidemic profile

    Time frame: Baseline and 6 months

    A blood sample will be obtained after overnight fasting (12 h), as previously described [37]. Total cholesterol, high-density lipoprotein (HDL) and triglycerides will be determined using a biochemical analyzer (Clinical Chemistry Analyzer Z 1145; Zafiropoulos Diagnostica S.A., Koropi, Greece), and low-density lipoprotein (LDL) will be calculated using the Friedewald equation.

  6. Lower body flexibility:

    Time frame: Baseline and 6 months

    The sit-and-reach test will be performed using a Flex-Tester box (Novel Products Inc., Rockton, IL, USA).

  7. Static balance

    Time frame: Baseline and 6 months

    The single-limb stance test (with eyes opened) was performed, as previously described by Rinne et al.

  8. Dynamic balance:

    Time frame: Baseline and 6 months

    The timed up-and-go test was performed, as previously described by Rikli and Jones.

  9. Handgrip strength

    Time frame: Baseline and 6 months

    Maximal isometric handgrip strength will be assessed using a portable hydraulic dynamometer (Jamar 5030J1, Horsham, USA).

  10. Aerobic capacity:

    Time frame: Baseline and 6 months

    The YMCA 3 min step test was used, which will be performed following the metronome cadence (96 beats per minute; 4 steps per cycle). The participants' HR will be measured 1 min following the termination of the step test.

  11. Adherence to the Mediterranean diet

    Time frame: Baseline and 6 months

    The adherence to the Mediterranean diet will be assessed before and after the 6-month period using the specific Mediterranean Diet Score (range of total score: 0-55) [34-35]. The MedDietScore measures the weekly consumption of the following 9 food groups: non-refined cereals (whole grain bread and pasta, brown rice, etc), fruit, vegetables, legumes, potatoes, fish, red meat and products, poultry, full fat dairy products (like cheese, yoghurt, milk), as well as olive oil and alcohol intake [35].

Sponsors and collaborators

Lead sponsor

University of Thessaly

Other

Registry information

Official study title

A Combined Workplace Intervention Including Exercise and Nutrition for Health Promotion in Obese Office Workers: a Randomized Controlled Study

Important dates

Study start
2023
Primary completion
2023
Study completion
2024
First posted
May 22, 2026
Registry last updated
May 28, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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