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Effects of Caffeine and Coffee on Resting Metabolic Rate, Comparing Normal Weight Men to Obese Men (RMR)

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ClinicalTrials.gov Identifier: NCT02751840
Recruitment Status : Completed
First Posted : April 26, 2016
Last Update Posted : April 27, 2016
Sponsor:
Information provided by (Responsible Party):
Tel Hai College

Brief Summary:

Background. The prevalence of obesity has increased in the last two decades. To maintain body weight energy expenditure (EE) should be equal to energy intake (EI). A low EE predisposes individuals to weight gain and to obesity that can also results from low resting metabolic rate (RMR). Caffeine (Caf) is an active food ingredient and is widely consumed globally, and has an important impact on energy balance. Caf reduces appetite (EI) and increases EE, thus, Caf has a potential role in body weight reduction. Caf causes higher total daily energy expenditure (TDEE) in normal weight (NW) people compared to obese (OW). Moreover Caf is linked to decreased fat oxidation in OW. There are differences between OW and NW in Caf pharmacokinetics, but no differences reported between NW and OW females in its effects on RMR. There is a gender difference in the influence of Caf on metabolism. The investigators are aware of no previous studies which compared the effect of Caf on the RMR of NW and OW men.

Objectives. 1) To compare the effect of Caf and coffee on resting metabolic rate (RMR) values in healthy normal-weight (NW) men and overweight (OW) men. 2) To develop Caf intake frequency questionnaire (in Hebrew)

Hypothesis. RMR values will be higher and respiratory exchange ratio (RER) values will be lower in NW compared to the values measured in OW men.

Methods. 33 men (16 NW and 17 OW) were reported to the laboratory on 4 separate occasions (placebo, Caf tablets, coffee and decaffeinated coffee). During the lab sessions they were undergo complete anthropometric measurements and RMR measured (one of the study conditions) using indirect calorimetry. Additionally, respiratory exchange ratio (RER) which is calculated as the ratio between CO2 production (VCO2) and O2 consumption (VO2) (VCO2/VO2), blood pressure and heart rate (HR) response recorded.

The importance of this study is that the results will contribute to the scientific basis of weight control and health interventions programs (diet and physical activity) in overweight men.


Condition or disease Intervention/treatment Phase
Asymptomatic Conditions Dietary Supplement: Caffeine Dietary Supplement: Placebo Other: Coffee Other: Decaffeinated Phase 3

Detailed Description:

Methods. 16 NW and 17 OW men were reported to the laboratory on 4 separate occasions (placebo, Caf tablets, coffee and decaffeinated coffee) each separated by 2-7 days. Before the first meeting they refill caffeine, physical activity and medical questionnaires. The investigators recruited only men who were healthy non-smokers with no comorbidities and the daily caffeine consumption was under 400 mg. Before each meeting participants had to comply guidelines outlined included fasting for 8 hours, avoiding intense physical activity 14 hours and moderate exercise 2 hours before measurements. The meetings conducted in the morning when the first session included anthropometric measurements (weight, height and waist circumference) and body composition measurements using Bioelectrical Impedance Analysis (BIA) and a digital caliper. Each session began with a measuring resting blood pressure and heart rate (Polar telemetric systems), after that participants were given randomly placebo or Caf tablets or coffee or decaffeinated coffee, waiting half an hour and then measuring the RMR and respiratory exchange ratio (RER), for half an hour using indirect calorimetry (canopy system). Then again measured blood pressure and heart rate at rest.

The sample size was calculated for 16 participant in each group, according to an expected change of 3% at RMR values between the groups with the power of 80% and significance of 0.05 . standard deviation (SD).


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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 33 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Basic Science
Official Title: Effects of Caffeine and Coffee on Resting Metabolic Rate, Comparing Normal Weight Men to Obese Men
Study Start Date : October 2014
Actual Primary Completion Date : August 2015
Actual Study Completion Date : April 2016

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Caffeine

Arm Intervention/treatment
Experimental: Caffeine
Caffeine capsule (200 mg) is taken prior to RMR measurement
Dietary Supplement: Caffeine
200 mg of caffeine capsule before RMR measurement

Dietary Supplement: Placebo
Placebo capsule (starch) before RMR measurement

Other: Coffee
9 grams of black coffee in boiling water consumed before RMR measurement

Other: Decaffeinated
9 grams of decaffeinated black coffee in boiling water consumed before RMR measurement

Placebo Comparator: Placebo
Placebo (starch) capsule is taken prior to RMR measurement
Dietary Supplement: Caffeine
200 mg of caffeine capsule before RMR measurement

Dietary Supplement: Placebo
Placebo capsule (starch) before RMR measurement

Other: Coffee
9 grams of black coffee in boiling water consumed before RMR measurement

Other: Decaffeinated
9 grams of decaffeinated black coffee in boiling water consumed before RMR measurement

Experimental: Coffee
Black coffee (9 grams) is consumed prior to RMR measurement
Dietary Supplement: Caffeine
200 mg of caffeine capsule before RMR measurement

Dietary Supplement: Placebo
Placebo capsule (starch) before RMR measurement

Other: Coffee
9 grams of black coffee in boiling water consumed before RMR measurement

Other: Decaffeinated
9 grams of decaffeinated black coffee in boiling water consumed before RMR measurement

Placebo Comparator: Decaffeinated
Decaffeinated Black coffee (9 grams) is consumed prior to RMR measurement
Dietary Supplement: Caffeine
200 mg of caffeine capsule before RMR measurement

Dietary Supplement: Placebo
Placebo capsule (starch) before RMR measurement




Primary Outcome Measures :
  1. Measurement of resting metabolic expenditure using indirect calorimetry (open flow canopy system) [ Time Frame: Within two weeks (4 sessions, each 30 minutes) ]


Information from the National Library of Medicine

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Ages Eligible for Study:   20 Years to 50 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

33 Healthy men at the age between 20-50 years. 16 normal weight men and 17 obese men.

Exclusion Criteria:

  1. Hypertension (above 140/90 mmHg)
  2. Taking medications for hypertension
  3. Heart, liver or kidney problems, diabetes, respiratory problems, hypo/hyper thyroidism.
  4. Smoking
  5. Men who consume caffeine above 400 mg/day
  6. Taking medications or dietary supplements that can affect energy expenditure
  7. Elite athletes (competitive sport)
  8. Night Eating

Publications:
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Responsible Party: Tel Hai College
ClinicalTrials.gov Identifier: NCT02751840     History of Changes
Other Study ID Numbers: Tel Hai College RMR-011
First Posted: April 26, 2016    Key Record Dates
Last Update Posted: April 27, 2016
Last Verified: April 2016
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

Additional relevant MeSH terms:
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Asymptomatic Diseases
Disease Attributes
Pathologic Processes
Caffeine
Central Nervous System Stimulants
Physiological Effects of Drugs
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Purinergic P1 Receptor Antagonists
Purinergic Antagonists
Purinergic Agents
Neurotransmitter Agents