Development and Strategic Research of Practical Applications in Sports Nutrition

NCT07598786 | Not Yet Recruiting

• 1 other identifier: NTSUIRB-115-010
• Study Type: interventional
• Target: 50
• Locations: 0 countries
• Sites: N/A

Brief Summary

This study evaluates the practical feasibility and potential effects of an 8-week dairy product intervention in physically active adults aged 18-39 years. Participants will consume a dairy product enriched with high protein, calcium, and vitamin D under real-life conditions. Assessments will be conducted before the intervention, after 4 weeks, and after 8 weeks, including subjective perception questionnaires, body composition analysis, and functional physical performance tests. The study aims to examine changes in physical status, functional capacity, and user experience during continuous product use.

Conditions

Healthy Volunteers

Outcome Measures

Primary Outcomes (5)

• Questionnaire-based subjective assessment

  Participants' subjective physical sensations, post-exercise fatigue, body image perceptions, and product use experience will be assessed using individual items from a self-administered questionnaire developed for this study. Questionnaire items may include Likert-scale items, categorical response options, and open-ended responses. Likert-scale items will be reported separately according to their original response scale, with the minimum and maximum values specified for each item. Categorical items will be reported as the number and percentage of participants selecting each response option. Open-ended responses will be summarized descriptively. No overall questionnaire total score will be calculated.

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Handgrip Strength Test

  Participants performed the test in a standing position with their arms naturally hanging down. They held the handgrip dynamometer with one hand and applied maximal force continuously for at least 3 seconds. Each hand was tested three times, and the best value was recorded.

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Push-Up Test

  Participants performed the push-up test on an exercise mat, with both hands placed shoulder-width apart to support the body. The fingers pointed forward, the elbows were fully extended, and the feet were approximately 10 cm apart. Male participants performed the test with support from the feet, whereas female participants performed the modified version with support from the knees. Participants were instructed to complete as many repetitions as possible while maintaining proper form. The test was terminated when the movement no longer met the required standard or could not be continued.

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Curl-Up Test

  Participants lay supine on an exercise mat with both knees bent and feet flat on the floor. They performed curl-ups according to a fixed rhythm. Participants were instructed to complete as many repetitions as possible while maintaining proper form. When a participant failed to perform the movement correctly once, the examiner raised one hand and indicated the number "one." If the participant failed a second time, the examiner indicated the number "two." The test was terminated when the participant failed twice or completed 75 repetitions. If the participant was unable to maintain the required rhythm or perform the movement according to the standard criteria, the test was stopped.

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Three-Minute Progressive Step-in-Place Test

  Participants performed step-in-place movements according to the instructions and raised their knees to the designated height. The test lasted for 3 minutes, with an initial cadence of 96 beats per minute, which was progressively increased each minute. During the test, heart rate was recorded using a heart rate monitor before exercise, during exercise, and during the post-exercise recovery period.

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

Secondary Outcomes (7)

• Body weight

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Body mass index

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Body fat percentage

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Fat mass

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

• Skeletal muscle mass

  The testing time points are set as follows: before the intervention, after 4 weeks of intervention, and after 8 weeks of intervention.

Study Arms (1)

Dairy intervention group

EXPERIMENTAL

An 8-week high-protein, high-calcium, and vitamin D-enriched dairy intervention.

Dietary Supplement: Dairy intervention

Interventions

Dairy intervention DIETARY_SUPPLEMENT

An 8-week high-protein, high-calcium, and vitamin D-enriched dairy intervention.

Dairy intervention group

Eligibility Criteria

• Age: 18 Years - 39 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Aged 18-39 years.
• Have regular exercise habits, defined as exercising at least three times per week, with each session lasting no less than 30 minutes. Exercise intensity should reach a heart rate of approximately ≥130 beats/min or a perceived intensity characterized by noticeable breathlessness and sweating.
• Preferably, at least one exercise session per week should include resistance training.
• Participants must be able to consume dairy products and have no lactose intolerance.

You may not qualify if:

• Individuals with lactose intolerance or an allergy to dairy products.
• Individuals who are pregnant, planning to become pregnant, or breastfeeding.
• Individuals with a smoking habit.
• Individuals diagnosed by a physician with cardiovascular disease, hypertension, metabolic disease, asthma, or kidney disease.
• Individuals with a body mass index (BMI) ≥27.
• Individuals who have experienced limb or neuromuscular exercise-related injuries within the past 6 months that prevent them from engaging in regular exercise.

Sponsors & Collaborators

• National Taiwan Sport University: lead

Study Officials

• Yi-Ju Hsu, Professor

  National Taiwan Sport University

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Yi-Ju Hsu

CONTACT

+886-3-328-3201 #2430; ruby780202@ntsu.edu.tw

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Study Record Dates

• First Submitted: May 8, 2026
• First Posted: May 20, 2026
• Study Start (Estimated): June 1, 2026
• Primary Completion (Estimated): September 1, 2026
• Study Completion (Estimated): September 1, 2026
• Last Updated: May 20, 2026

Record last verified: 2026-05