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NCT Number: NCT06570226

Discussion on the Effectiveness of Tea on Blood Pressure, Body Composition and Vision Problems in College Students

Background:

Tea is a universal beverage and one of the most popular drinks around the world. Some cell and animal experiments have pointed out that drinking tea may be related to hypotension, body composition and vision problems, and there are more and more related advertisements, especially for hibiscus tea, which is rich in anthocyanins. However, there is a lack of literature on the effectiveness of hibiscus tea drinks in preventing and treating blood pressure, body composition and vision problems in college students.

Purposes:

This study used a randomized human trial to evaluate the effects of drinking hibiscus tea on the control and reduction of blood pressure, body composition, and near vision problems. 100 subjects were divided into 2 groups: the hibiscus tea group and the boiled water drinking group, and they continued to drink it for 10 weeks. At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, the visual fatigue scale, blood pressure, and body composition were examined respectively. At the initial stage (0th week) and at the 10th week after stopping drinking, visual acuity examinations were performed.

Expected results:

1. To explore the effect of hibiscus tea drinks on subjects' myopia. 2. To explore the effect of hibiscus tea drinks on visual fatigue of subjects. 3. To explore the effect of hibiscus tea drinks on the blood pressure of subjects. 4. To explore the impact of hibiscus tea drinks on the body composition of subjects. 5. To explore the effect of hibiscus tea drinks on body fat of subjects.

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Key information

Conditions

Myopia Asthenopia Blood Pressure Body Composition Body Fat Eye Diseases Refractive Errors Visual Fatigue

Age range

15 year–22 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

University of Kang Ning

Taipei, 114, Taiwan

Location status: Recruiting

Location contact

Ciao-Lin Ho, PhD

CONTACT

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • The inclusion criteria are college students aged 15 to 22 years old. -

Exclusion criteria

  • hemodialysis patients who need to limit their water intake
  • those with a history of gastric ulcers
  • those allergic to anthocyanins
  • those who have long-term consumption or consumption of beverages, foods or health products containing high anthocyanins that may interfere with the study after evaluation, for example: foods or health foods such as cranberries, blueberries, cherries and grapes.

Treatment and study plan

hibiscus tea

Dietary Supplement

Some cell and animal experiments have pointed out that drinking tea may be related to hypotension, body composition and vision problems, and there are more and more related advertisements, especially for hibiscus tea, which is rich in anthocyanins.

Primary outcomes

  1. To explore the effect of hibiscus tea drinks on subjects' myopia.

    Time frame: At the beginning of the trial (week zero) and the tenth week

    At the beginning of the trial (week zero), and the tenth week after stopping drinking, Myopia (spherical equivalent refractive error, unit: diopter) was examined.

  2. To explore the effect of hibiscus tea drinks on visual fatigue of subjects.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, the visual fatigue scale was examined by Visual Fatigue Questionnaire (Heuer et al,1989).

    Heuer, H., Hollendiek, G., Kröger, H., & Römer, T. (1989). Rest position of the eyes and its effect on viewing distance and visual fatigue in computer display work. Zeitschrift fur experimentelle und angewandte Psychologie, 36(4), 538-566.

  3. To explore the effect of hibiscus tea drinks on the blood pressure of subjects.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, blood pressure (mmHg) was examined.

  4. To explore the impact of hibiscus tea drinks on weight.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, weight (kg) was examined.

  5. To explore the impact of hibiscus tea drinks on muscle mass for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, muscle mass (kg) was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). Tanita Home Page. Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  6. To explore the impact of hibiscus tea drinks on muscle quality for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, muscle quality (MQ) was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). MQ = muscle strength (kg)/muscle mass (kg). Tanita Home Page. Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  7. To explore the impact of hibiscus tea drinks on physique ratings for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, physique ratings was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). Physique ratings were determined as follows: 1-Hidden Excess Fat, 2-Medium Frame & Excess Fat, 3-Solidly Built, 4-Low Muscle, 5-Standard, 6-Muscular, 7-Low Muscle & Low Fat, 8-Thin & Muscular (Athlete), and 9-Very Muscular (Athlete). Tanita Home Page. Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  8. To explore the impact of hibiscus tea drinks on Visceral Fat for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, Visceral Fat was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). Based on all the available information it gives you a range between 1 and 59. A rating between 1 and 12 indicates that you have a healthy level of visceral fat. A rating between 13 and 59 indicates that you have an excessive level of visceral fat.Tanita Home Page. Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  9. To explore the impact of hibiscus tea drinks on BMR (Basal Metabolic Rate) for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, BMR (kcal) was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). Tanita Home Page, Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  10. To explore the impact of hibiscus tea drinks on total body water (%) for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, total body water (%) was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). The ideal percentage for adult women will fluctuate between 45 and 60%, while the ideal percentage for adult men will be between 50 and 65% of the total body. Tanita Home Page, Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  11. To explore the impact of hibiscus tea drinks on BONE MASS for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, BONE MASS (kg) was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). Tanita Home Page, Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  12. To explore the impact of hibiscus tea drinks on BMI for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, BMI (kg/m^2) was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). Tanita Home Page, Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  13. To explore the impact of hibiscus tea drinks on Metabolic age for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, Metabolic age was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). Tanita Home Page, Available online: https://tanita.eu/understanding-your-measurements (accessed on 13 August 2022).

  14. To explore the effect of hibiscus tea drinks on body fat percentage of subjects for body composition.

    Time frame: At the beginning of the trial (week zero), the second week, the sixth week and the tenth week

    At the beginning of the trial (week zero), the second week, the sixth week, and the tenth week after stopping drinking, body fat percentage (%) was examined by the TANITA RD-545 (Tanita Corporation, Tokyo-Japonya). .

Study contacts

Contact information is provided by the study sponsor or research team.

Ciao-Lin Ho, PhD

CONTACT

[email protected]

+886-4-26318652 ext. 5201, 5259

Sponsors and collaborators

Lead sponsor

Hungkuang University

Other

Registry information

Important dates

Study start
2024
Primary completion
2025
Study completion
2025
First posted
Aug 26, 2024
Registry last updated
Aug 26, 2024

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

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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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