Sex Differences in Cold-Induced Changes in Maximal Fat Oxidation

NCT ID: NCT07297823

Last Updated: 2025-12-26

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

NOT_YET_RECRUITING

Clinical Phase

NA

Total Enrollment

20 participants

Study Classification

INTERVENTIONAL

Study Start Date

2026-01-31

Study Completion Date

2027-06-30

Brief Summary

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The purpose of this research study is to determine if the cold-induced change in fat burning during exercise is different between females and males.

Detailed Description

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It is well characterized that females rely more on fat oxidation compared to men during standardized exercise. Exposure to cold during exercise increases fat oxidation in humans. It has been shown that the biological sex differences in substrate oxidation observed during exercise persist in the cold. However, it is unclear if the degree of the effect of cold on substrate oxidation during exercise is different between females and males.

The purpose of this study is to determine if the change in maximal fat oxidation that occurs in cold compared to room temperature environments is different between females and males.

The hypotheses are 1) females will have greater maximal fat oxidation than males in both conditions, and 2) the change in maximal fat oxidation between the control and cold conditions will be the same in females and males.

Conditions

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Exercise

Keywords

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exercise fat temperature cold metabolism

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

OTHER

Blinding Strategy

NONE

Study Groups

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Exercise at room temperature

Study participants will ride an exercise bike

Group Type ACTIVE_COMPARATOR

Room Temperature

Intervention Type OTHER

Exercise condition for control arm

Exercise at cold temperature

Study participants will ride an exercise bike. Room temperature will be 5 ºC

Group Type EXPERIMENTAL

Cold temperature

Intervention Type OTHER

Room temperature will be decreased to 5 ºC

Interventions

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Cold temperature

Room temperature will be decreased to 5 ºC

Intervention Type OTHER

Room Temperature

Exercise condition for control arm

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Age 18-40 years (inclusive)
* Weight stable (no change in body mass greater than 5 lbs. within the previous 6 months.
* Willing to abstain from caffeine and alcohol for 24-hours prior to two different study visits
* Competency in English as informally assessed by comprehension of the Informed Consent. This study involves maximal exercise testing; for safety reasons, the ability for clear and rapid communication will be necessary between the research participants and the investigators.
* Regular exercise (i.e., at least 150 minutes of moderate-vigorous exercise per week)

Exclusion Criteria

* Use of hormonal contraceptives
* History of autonomic, cardio-pulmonary, and/or metabolic disease (including heart failure, hypertension, arrhythmia, vascular disease, and/or diabetes)
* Pregnancy or breast feeding
* Habitual use of tobacco/nicotine products or recreational drugs (2 or more uses within the previous month)
Minimum Eligible Age

18 Years

Maximum Eligible Age

40 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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Colorado State University

OTHER

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Christopher Bell

Role: PRINCIPAL_INVESTIGATOR

Colorado State University

Central Contacts

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Christopher Bell

Role: CONTACT

Phone: 9704917522

Email: [email protected]

Christina Cheng

Role: CONTACT

Phone: 9704913495

Email: [email protected]

Other Identifiers

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7231

Identifier Type: -

Identifier Source: org_study_id