The Effects of β-Hydroxy-β-methylbutyrate Free Acid and High-Intensity Interval Training

Not Applicable

Completed

• Conditions: Exercise

• Registration Number: NCT01941368
• Lead Sponsor: Metabolic Technologies Inc.

Brief Summary

Objectives: 1) Determine the effect of 4-weeks of high intensity interval training (HIIT) and free acid form β-Hydroxy-β-methylbutyrate (HMB-FA) on VO2peak, lactate threshold, critical power, anaerobic working capacity and neuromuscular economy in a population of endurance trained individuals. 2) Determine the effect of 4-weeks of HIIT and HMB-FA on changes in skeletal muscle physiological cross-sectional area (PCSA=Volume/Fascicle length) and muscle quality (MQ=echo intensity) in the rectus femoris and vastus lateralis.

Subjects: Fifty males and females between the ages of 18 - 35 will be recruited to participate in this study. Subject will be randomized to one of three groups: a control group (CTL), an HIIT only group (HIIT) or a group which will take the amino acid metabolite HMB and perform HIIT (HMB-HIIT). Individuals assigned to CTL will undergo baseline testing. They will then be asked to continue their normal exercise routine for 4 weeks and will undergo post-testing after this time period.

Study Protocol: Two testing sessions, on nonconsecutive days, will occur at least 72 hours prior to the start of the training period. The same testing protocols will be repeated at the end of the 4-week training period. Testing protocols include performance testing (VO2peak, lactate threshold, critical power, anaerobic working capacity and neuromuscular economy) and anthropometric measures (physiological cross-sectional area and muscle quality). The training protocol for individuals in the experimental groups will consist of 4-weeks of high intensity interval training with three sessions per week on an electronically braked cycle ergometer. Individual work -loads will be calculated based on the outcomes from each participant's preliminary testing.

Detailed Description

Not available

Study Timeline

• Study Start: 2013-09
• Study First Submitted: 2013-09-04
• Study First Submitted QC: 2013-09-09
• Study First Posted: 2013-09-13
• Primary Completion: 2013-12
• Study Completion: 2013-12
• Status Verified: 2014-03
• Last Update Submitted: 2014-03-14
• Last Update Posted: 2014-03-17

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

• Recreationally-trained individuals with a VO2peak>40 ml∙kg-1∙min-1.
• Free of any physical limitations as determined by the Confidential Medical and Activity questionnaire and/or PAR-Q
• Between the ages of 18 and 35

Exclusion Criteria

• Inability to perform physical exercise, as determined by the Confidential Medical and Activity questionnaire and/or PAR-Q
• Any chronic illness that causes continuous medical care

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
VO2peak/Ventilatory Threshold/fatigue threshold	Change from baseline after four weeks of high intensity interval training	A continuous graded exercise test will be performed on an electronically-braked cycle ergometer to determine maximal oxygen consumption (VO2peak) and the peak power output (PPO) in watts (W) at VO2peak.

Secondary Outcome Measures

Name	Time	Method
EMG Activity Assessment	Change from baseline after four weeks of high intensity interval training	To assess EMG activity, a bipolar surface electrode arrangement will be placed over the muscles of the quadriceps. The EMG signals will be expressed as root mean square (RMS) amplitude values. During the leg extensor trial, electromyography (EMG) root mean square (RMS) amplitude values will be recorded

Trial Locations

Locations (1)

University of Central Florida, Sport and Exercise Science; 🇺🇸 Orlando, Florida, United States