High-Intensity Interval Training and Intermittent Fasting on Body Composition and Physical Performance in Active Women

Study Overview
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Brief Summary
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The objective of this study is to compare the body composition and physical performance effects of HIIT, with or without intermittent fasting intervention in active women. Fourteen active normal weight women aged 18-35 participated in the study. The effects of 2x8 weeks without (HIIT) or with (HIIT+IF) intermittent fasting caloric restriction (20% reduction in weekly energy intake) on body composition and performance (Hand-grip strength, Counter movement jump, Wingate Anaerobic 30 s Cycling Test), were compared. There were two weeks in between both phases when they did not perform the scheduled activity, so as not to alter the experimental phase.

Official Title
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Effect of High-Intensity Interval Training and Intermittent Fasting on Body Composition and Physical Performance in Active Women

Conditions
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Body Composition, Physical Performance, Intermittent Fasting

Intervention / Treatment
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* Behavioral: Intensity interval training (HIIT)
* Behavioral: Intensity interval training (HIIT) + intermittent fasting


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: No muscular, ligamentous, bone, nerve or joint pathology incompatible with the training program. Not to present cardiovascular or cardiorespiratory problems. Physically active in the last 5 years, according to the American College of Sports Medicine (ACSM) definition. Exclusion Criteria: Following pharmacological treatment or supplement. Performing other sports activities that may influence the study results during their participation in the study. Not following training or diet program guidelines or attending scheduled training sessions.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 35 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: PARTICIPANTS<br>A single-group crossover design was used to compare the effects of 2x8 weeks of high-intensity interval training without (HIIT) or with (HIIT+IF) intermittent fasting caloric restriction (20% reduction in weekly energy intake) on body composition and performance. There were two weeks in the middle of both phases in which they did not carry out programmed activity, in order not to alter the experimental phase. | Behavioral: Intensity interval training (HIIT)<br>* 2x8 weeks of high-intensity interval training (HIIT)<br>Behavioral: Intensity interval training (HIIT) + intermittent fasting<br>* 2x8 high-intensity interval training with (HIIT+IF) intermittent fasting caloric restriction (20% reduction in weekly energy intake).<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Hand-grip strength | Hand-grip strength test was performed as an indicator of overall strength. | 16 weeks | 
| Counter movement jump (CMJ) | In the CMJ test, the participants performed a maximum vertical jump starting from a standing position with arm swing not allowed. | 16 weeks | 
| Wingate Anaerobic 30 s Cycling Test | Wingate Anaerobic 30 s Cycling Test with a validated cycloergometer (Monark 894E, Vansbro, Sweden). | 16 weeks | 
| Fat mass | Body composition masses were estimated using validated equations. Carter's equation was used to estimate fat mass. | 16 weeks | 
| Muscle mass | Body composition masses were estimated using validated equations. Lee's equation to estimate muscle mass. | 16 weeks | 
| Residual mass | Body composition masses were estimated using validated equations. Residual mass was obtained from the difference between fat mass and muscle mass. | 16 weeks | 
| Body Mass | It was performed using a digital scale with 0,1kg accuracy (Tanita BC-545, Tokyo, Japan). | 16 weeks |