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Completed

NCT Number: NCT01424904

DGB-01 Effects on Endurance Exercise

The purpose of this research is to evaluate the effects of DGB-01 on performance of a 40-km time trial in trained male cyclists. The investigators believe that DGB-01 will improve performance on the time trial as measured by a reduction in the amount of time required to complete the distance, using a computerized cycle ergometer.

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Key information

Conditions

Fatigue Pathological Conditions, Signs and Symptoms Signs and Symptoms

Age range

18 year–60 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

Center for Clinical and Translational Science

Lexington, Kentucky, 40536, United States

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • Healthy males who are trained cyclists with a maximal oxygen uptake relative to body weight equal to or greater than 45 ml O2/kg/min.
  • Subjects must be in the competitive phase of their annual training cycle.
  • Between ages of 18-60
  • Availability- commitment of the subject/expected participation in the study for 97 days.

Exclusion criteria

  • Specific allergy to milk proteins (this is different from lactose intolerance)
  • Use of immunosuppressive medication in the case of organ transplants
  • Planned surgeries.
  • Kidney disorders
  • Use of antihypertensive medications
  • Cardiovascular disease
  • Abnormal BUN, creatinine, hemoglobin, or hematocrit
  • Body weight greater than 285 pounds
  • A protein-restricted diet
  • Subjects currently using dry whey protein supplements, N-acetylcysteine, or alpha-lipoic acid supplements. The wash-out period is 1 month for any of these supplements.
  • All medications that can interfere with muscle mass such as corticosteroids (e.g. prednisone), testosterone replacement or anabolic drugs such as Megace

Treatment and study plan

DGB-01 Supplementation

Dietary Supplement

Approximately one-half of the subjects will initially receive DGB-01. The other half of the subjects will receive casein. Investigators and subjects are blinded to the product the subject is receiving. Subjects will be asked to consume one pouch of their assigned study product twice daily for four weeks.

Subsequently, all subjects will undergo a supplement-free washout period of at least four weeks duration. Following the washout period, the subjects who originally received DGB-01 will receive casein and the subjects who originally received casein will receive DGB-01. Subjects will be asked to consume one pouch of their assigned study product twice daily for four weeks.

Primary outcomes

  1. The efficacy of DGB-01 in promoting exercise endurance will be measured by cycling performance on a standardized 40-km time trial course.

    Time frame: Individual participants will be followed for the duration of study enrollment, an expected average of 97 days. The study will remain open for up to 2 years or until subject number requirement is met.

    Time to complete the 40km time trial for subjects with DGB-01 intervention in period 1 (minimum 4 weeks of supplementation) versus the time for time trial completion of these subjects with casein in period 2 (minimum of 4 weeks of supplementation); Between the two periods with supplementation, there will be a washout period of a minimum 4 weeks; Results of time trial for subjects with DGB-01 intervention in period 2 (minimum 4 weeks of supplementation) versus the time trial completion of these subjects with casein in period 1 (minimum 4 weeks supplementation).

Secondary outcomes

  1. Change in markers of plasma thiol status over the course of each time trial

    Time frame: Individual participants will be followed for the duration of study enrollment, an expected average of 97 days. The study will remain open for up to 2 years or until subject number requirement is met.

    • A) Plasma samples will be obtained before and during the final minute of each time trial. These samples will be stored at -80oC for no longer than 14 days to prevent sample deterioration.
    • B) All samples will be analyzed for glutathione (GSH), oxidized glutathione (GSSG), cysteine (CySH), cystine (CySS), and cysteine-glutathione disulfide (CySSG) using high-performance liquid chromatography (Clinical Biomarkers Laboratory, Emory University, Atlanta, GA). Total glutathione (TGSH) will be calculated as GSH + 2•GSSG + CySSG. Total cysteine (TCyS) will be calculated as CySH + 2•CySS + CySSG.

  2. Outcome from specific questionnaires

    Time frame: Individual participants will be followed for the duration of study enrollment, an expected average of 97 days. The study will remain open for up to 2 years or until subject number requirement is met.

    A) The Standardized Overtraining Questionnaire of The French Society for Sports Medicine (SFMS) B) Foster's Psychological Complaint Index C) Classification of Muscle Soreness

Sponsors and collaborators

Lead sponsor

William Black

Other

Collaborators

  • Immunotec Inc.

Registry information

Important dates

Study start
2012
Primary completion
2013
Study completion
2013
First posted
Aug 29, 2011
Registry last updated
Oct 18, 2013

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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