"F!reF!ghterF!t": Lifestyle Coaching Interventions for Obese Firefighters (FireFit)

Not Applicable

Recruiting

• Conditions: Obesity and Obesity-related Medical Conditions

• Registration Number: NCT06890975
• Lead Sponsor: Cambridge Health Alliance

Brief Summary

Our goal is to explore the effectiveness of 9- month lifestyle medicine based coaching intervention (individual and group coaching) versus control (usual care/ written health instructions). The primary study outcomes will be mean changes in body composition metrics . Secondary outcomes will be the prevalence of metabolic abnormities, progression/regression of Metabolic Syndrome, push-up \& sit/stand capacity, self-reported physical activity, and quality of life/diet/sleep measures.

Detailed Description

RATIONALE/GOALS: Obesity is a major health hazard in the US fire service. It contributes to excess cancer, cardiovascular disease and behavioral health issues. Obesity is negatively associated with 12/13 health priorities identified by the National Fallen Firefighter Foundation. Mitigating obesity is crucial to the fire service's goals of reducing chronic diseases and their adverse economic/operational impacts.

METHODS: At least 75 male firefighters self-reporting a body mass index (BMI) of \>/= 30 kg/m2 AND interest in weight loss will complete a baseline health assessment including: lifestyle scores, body composition, metabolic/hormonal indices, physical fitness, and behavioral health screens, until 50 eligible firefighters have been consented and enrolled. After the initial clinical evaluation, 50 eligible firefighters will be randomized into the two study groups (about 25 firefighters to each arm): 1. General Health Instructions (CONTROL) and 2. Individual \& Group Lifestyle Coaching based on the six pillars of Lifestyle Medicine \& Full Plate Living. Participants will repeat the all health/fitness measures at 3-, 6- and 9-months post study entry. The two treatment groups will be compared on an intention to treat basis.

ANTICIPATED OUTCOMES: Compared to CONTROL, firefighters receiving the Lifestyle Coaching Intervention should achieve significantly greater improvements in body composition, metabolic \& other health measures, as well as adopt healthy lifestyle behaviors.

Study Timeline

• Status Verified: 2025-01
• Study Start: 2025-01-21
• Study First Submitted: 2025-03-12
• Study First Submitted QC: 2025-03-20
• Study First Posted: 2025-03-24
• Last Update Submitted: 2025-06-23
• Last Update Posted: 2025-06-26
• Primary Completion: 2025-12-31
• Study Completion: 2026-01-01

Recruitment & Eligibility

• Status: RECRUITING
• Sex: Male
• Target Recruitment: 50

Inclusion Criteria

• Male firefighters aged 18-60 years
• Currently active as volunteer or career firefighters
• Body mass index (BMI) ≥30 kg/m² based on self-reported height and weight
• Express interest in participating in a clinical study aimed at improving body composition (weight loss), metabolic status, and quality of life
• Residing and/or working in Massachusetts, Rhode Island, or Southern New Hampshire (Boston metro area)

Exclusion Criteria

• Female sex*
• BMI <30 kg/m² based on self-reported height and weight
• Active psychosis
• History or diagnosis (during the RCT) of any of the following:

Major cardiovascular disease event (e.g., myocardial infarction, cardiac arrest, cerebrovascular accident) Cancer (excluding non-melanoma skin cancer) Abnormal liver function (aminotransferase, bilirubin, or alkaline phosphatase ≥3× the upper limit of normal) Renal dysfunction (estimated glomerular filtration rate ≤30 mL/min/1.73 m²)

• Current or recent (within 6 months) use of testosterone treatment or anti-obesity/obesogenic medications

• Unwillingness to adhere to potential intervention assignments

  • Because this is an exploratory study, the number of subjects is limited, and men make up roughly 85% of the US fire service, the current proposal is limited to men. In future studies, we will include women firefighters.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Mean change in body mass index	From the start of the intervention to its conclusion at nine months.	Body Mass Index (kg/m-squared)
Mean change in body fat	From the start of the intervention to its conclusion at nine months.	Body fat percentage as measured by bioelectrical impedance
Mean change in waist circumference	From the start of the intervention to its conclusion at nine months.	Waist circumference (cm)
Mean change in waist/hip ratio	From the start of the intervention to its conclusion at nine months.	Waist/hip ratio (waist circumference (cm) divided by hip circumference (cm)

Secondary Outcome Measures

Name	Time	Method
Prevalence of Metabolic Syndrome	From the start of the intervention to its conclusion at nine months.	Number (%) of participants with 3 or more metabolic syndrome components
Push-up capacity	From the start of the intervention to its conclusion at nine months.	1-minute push-up capacity
Sit/stand capacity	From the start of the intervention to its conclusion at nine months.	1-munute sit to stand completions
Self-reported quality of life	From the start of the intervention to its conclusion at nine months.	Score based on the validated Short Form-12 Health Survey (SF-12). The SF-12 generates two summary scores: the Physical Component Summary (PCS) and the Mental Component Summary (MCS), each ranging from 0 to 100. Higher scores indicate better health-related quality of life.
Self-reported Healthy Lifestyle Score	From the start of the intervention to its conclusion at nine months.	Score based on self-reported health behaviors from a standardized survey tool with validated component metrics

Trial Locations

Locations (1)

Cambridge Health Alliance; 🇺🇸 Sommerville, Massachusetts, United States