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Completed

NCT Number: NCT07488273

Whey Protein Supplementation and Serum Mineral Status in Elite Endurance and Power Athletes

This study investigates whether 8 weeks of post-training whey protein supplementation (30 g/day) affects serum mineral concentrations (calcium, phosphorus, magnesium, and iron) in elite endurance and power athletes during structured training.

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Key information

Conditions

Athletic Performance

Age range

18 year–30 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Training Centers

Tunis, Tunisia

About this study

This is a 10-week non-randomized, open-label intervention study involving elite male track-and-field athletes aged 18-26 years. Participants are allocated into a whey protein supplementation group or a control group based on convenience allocation. The intervention consists of daily intake of 30 g whey protein following training sessions over 8 weeks. Blood samples are collected at baseline and post-intervention to assess serum calcium, phosphorus, magnesium, and iron levels. The study aims to differentiate supplementation effects from training-induced physiological changes.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • Male elite track-and-field athletes
  • Age 18-30 years
  • Engaged in structured training program
  • No supplement use in past 3 months

Exclusion criteria

  • Use of nutritional or mineral supplements
  • Metabolic or musculoskeletal disorders
  • Acute injury affecting performance
  • Use of ergogenic aids (e.g., creatine, anabolic agents)

Treatment and study plan

Whey protein supplementation

Dietary Supplement

Participants in the intervention group consumed 30 g/day of whey protein powder within 30 minutes after training sessions for 8 weeks as part of a structured training program. The supplement (IronMaxx®, 100% Whey Protein) primarily consisted of whey protein concentrate and provided approximately 24 g of protein per daily dose. The intervention was administered in an open-label manner without placebo control. Participants were instructed to maintain their habitual diet and refrain from using additional nutritional supplements during the study period.

Other names: Whey protein powder, IronMaxx 100% Whey Protein

No Supplement (Control)

Other

Participants continued their usual sport-specific training program for 8 weeks without receiving whey protein or any additional nutritional supplementation. They were instructed to maintain their habitual diet and avoid initiating any new supplements during the study period.

Other names: Usual training only

Primary outcomes

  1. serum mineral concentrations (Calcium, Phosphorus, Magnesium, Iron)

    Time frame: Baseline (Week 1) and Post-Intervention (Week 10)

    Serum concentrations of calcium, phosphorus, magnesium, and iron will be measured using standardized enzymatic and colorimetric assays from venous blood samples collected at rest. Measurements will be performed at baseline and after the intervention to assess changes associated with training and whey protein supplementation in elite athletes.

Sponsors and collaborators

Lead sponsor

Monira Aldhahi

Other

Registry information

Official study title

Whey Protein Supplementation and Serum Mineral Status in Elite Endurance and Power Athletes: A Two-Month Non-Randomized Open-Label Intervention Study

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Mar 23, 2026
Registry last updated
Mar 24, 2026

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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