Calorie Restriction Diets on Weight Reduction, Post weigh-in Recovery and Exercise Performance in Athletes

Diet, Reducing Clinical Trial

Official title:

The Metabolomic Exploration of Low-carbohydrate and Calorie Restriction Diet on Weight Reduction, Post weigh-in Recovery and Exercise Performance in Taekwondo Athletes

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT05017259
• Other study ID #: MOST 108-2410-H-028-005
• Status: Completed
• Phase: N/A
• Start date: August 17, 2019
• Est. completion date: September 26, 2019

Study information

• Verified date: August 2021
• Source: National Taiwan Sport University
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Low-carbohydrate diets are often used as weight-loss strategies by obese individuals and athletes. This diet has effects on oxidizing fat and suppressing appetite. But short term evidences are still few. In combat sports such as taekwondo, athletes prefer rapid weight loss to achieve a desired weight category. The purpose of this study was to investigate the impact of the low carbohydrate diet combined with strict calorie restriction on body composition and exercise performance in taekwondo athletes.

Description:

This study used a randomized cross-over design. Each participant completed a low carbohydrate and a high carbohydrate trial in a random order, separated by a 30-day wash-out period. Each trial comprised of a 7-day weight loss period, followed by an 18-hr recovery period. The purpose of this study was to investigate the effect of 7-day caloric restriction with low- or high-carbohydrate diet, combined with an 18-hr recovery period, on body weight loss and taekwondo-specific performance.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 12
• Est. completion date: September 26, 2019
• Est. primary completion date: September 26, 2019
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Male
• Age group: 20 Years to 24 Years

Eligibility

Inclusion Criteria:

• Must have at least 6 years of Taekwondo training experience

• Must have participated in domestic or international competitions

Exclusion Criteria:

• Smoking

• Cardiovascular disease

• Diabetes

• Hypertension

• Any medication in the past 3 months

Related Conditions & MeSH terms

• Diet, Reducing
• Weight Loss

Intervention

Dietary Supplement:
• calorie restriction diet
The 7-day low-calorie diet contained 15.8 ± 0.4 kcal/kg/d in both trials, divided into three meals a day.

Locations

Country	Name	City	State
Taiwan	National Taiwan University of Sport	Taichung

Sponsors (1)

Lead Sponsor	Collaborator
Chin Hsu

Country where clinical trial is conducted

Taiwan, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Body weight in kilograms assessed by air-displacement plethysmography (Bod Pod)	The body weight (kg) of participants was determined before and after calorie restriction intervention to evaluate the degree of weight loss.	1 min
Primary	Body fat mass in kilograms assessed by air-displacement plethysmography (Bod Pod)	The body fat mass (kg) of participants was determined before and after calorie restriction intervention to evaluate the degree of weight loss.	1 min
Primary	Lean body mass in kilograms assessed by air-displacement plethysmography (Bod Pod)	The lean body fat mass (kg) of participants was determined before and after calorie restriction intervention to evaluate the degree of weight loss.	1 min
Secondary	Taekwondo-specific reaction time in seconds assessed by Electromyography (EMG) signals	The reaction time (sec) was measured before and after weight loss to assess the difference in exercise performance. The participants were asked to make the fist on the left hand as soon as they see a light signal, then start the taekwondo-specific movement. The reaction time was calculated as the time from the beginning of the light signal to the start of electromyography (EMG) signal of the left thenar muscles. The movement was performed 5 times. The average reaction time was used to arrive at one reported value.	1 min