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.

Study Overview

• Status: Completed
• Conditions: Fatigue
• Intervention / Treatment: Dietary supplement: DGB-01 Supplementation

• Study Type: Interventional
• Enrollment (Actual): 29
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Kentucky
    • Lexington, Kentucky, United States, 40536
      • Center for Clinical and Translational Science

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 60 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Male

Description

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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Supportive Care
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: Double

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: DGB-01; All subjects will receive DGB-01 during the study. Approximately one-half of the subjects during the first period and the other half during the second period.

Dietary supplement: DGB-01 Supplementation; 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.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The efficacy of DGB-01 in promoting exercise endurance will be measured by cycling performance on a standardized 40-km time trial course.	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).	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.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in markers of plasma thiol status over the course of each time trial	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.	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.
Outcome from specific questionnaires	A) The Standardized Overtraining Questionnaire of The French Society for Sports Medicine (SFMS) B) Foster's Psychological Complaint Index C) Classification of Muscle Soreness	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.

Collaborators and Investigators

• Sponsor: William Black
• Collaborators: Immunotec Inc.
• Investigators: Principal Investigator: Michael Reid, Ph.D, University of Kentucky, Dept of Physiology; Principal Investigator: William Black, MD, University of Kentucky, Dept of Physiology

Study record dates

Study Major Dates

• Study Start: February 1, 2012
• Primary Completion (Actual): June 1, 2013
• Study Completion (Actual): June 1, 2013

Study Registration Dates

• First Submitted: August 19, 2011
• First Submitted That Met QC Criteria: August 26, 2011
• First Posted (Estimate): August 29, 2011

Study Record Updates

• Last Update Posted (Estimate): October 18, 2013
• Last Update Submitted That Met QC Criteria: October 17, 2013
• Last Verified: October 1, 2013

More Information

Terms related to this study

• Keywords: Glutathione; Ergogenic aid; Exercise endurance; High performance; Time trial performance
• Additional Relevant MeSH Terms: Fatigue
• Other Study ID Numbers: 11-0626-F1V