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Completed

NCT Number: NCT05017259

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

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.

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Key information

Conditions

Diet, Reducing

Age range

20 year–24 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

National Taiwan University of Sport

Taichung, Taiwan

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

calorie restriction diet

Dietary Supplement

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

Primary outcomes

  1. Body weight in kilograms assessed by air-displacement plethysmography (Bod Pod)

    Time frame: 1 min

    The body weight (kg) of participants was determined before and after calorie restriction intervention to evaluate the degree of weight loss.

  2. Body fat mass in kilograms assessed by air-displacement plethysmography (Bod Pod)

    Time frame: 1 min

    The body fat mass (kg) of participants was determined before and after calorie restriction intervention to evaluate the degree of weight loss.

  3. Lean body mass in kilograms assessed by air-displacement plethysmography (Bod Pod)

    Time frame: 1 min

    The lean body fat mass (kg) of participants was determined before and after calorie restriction intervention to evaluate the degree of weight loss.

Secondary outcomes

  1. Taekwondo-specific reaction time in seconds assessed by Electromyography (EMG) signals

    Time frame: 1 min

    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.

Sponsors and collaborators

Lead sponsor

Chin Hsu

Other

Registry information

Official study title

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

Important dates

Study start
2019
Primary completion
2019
Study completion
2019
First posted
Aug 23, 2021
Registry last updated
Aug 23, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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