Effect of Carbohydrate-protein Co-ingestion on Short-term Recovery
Condition: Dietary Supplementations
Study type: Interventional

Summary: 
      The purpose of this study is to determine whether the consumption of a carbohydrate,
      carbohydrate plus protein, or placebo sports drink during a 2-hour recovery period
      effectively moderates performance decrements during a subsequent bout of high-intensity
      exercise. This information will benefit any endurance-trained masters class athlete who may
      need to compete or train multiple times a day.
    

Detailed description: 
      To test the hypothesis, this study will utilize a randomized, double-blind,
      placebo-controlled between-subject design to examine the effects of carbohydrate (CHO) and
      carbohydrate-protein (CHO-P) supplementation on short-term recovery following aerobic
      interval exercise (INT) and time to exhaustion (TTE) testing in maters class athletes. After
      completing the informed consent and screening process (Visit #1), each participant will be
      assessed for their anthropometric measures as well as body composition and will complete a
      graded exercise test to volitional exhaustion on a cycle ergometer to determine VO2peak.
      Forty-eight to 72 hours after Visit #1, or VO2peak testing, participants will return to the
      lab for familiarization with the INT exercise protocol and TTE test (Visit #2). Within
      forty-eight to 72 hours after familiarization (Visit #2), participants will return to the lab
      for Visit #3 to complete INT exercise and TTE, a 2-hour passive recovery period including the
      consumption of one of three treatments (CHO, CHO-P, PLA), followed by repeated INT exercise
      and TTE, heart rate variability and sweat rate determination. Participants will also complete
      the Nutritional Recovery Practices, Knowledge, and Beliefs of Australian Triathletes survey
      during the 2-hour recovery period. Participants will be asked to complete the ASA24®, an
      automated self-administered 24-hour dietary assessment tool during the 5-9-day period between
      familiarization (Visit #2) and the experimental protocol (Visit #3).
    

Intervention name(s): Carbohydrate; Carbohydrate-Protein; Placebo
Intervention type(s): Dietary Supplement; Dietary Supplement; Dietary Supplement
Intervention description(s): Participants have a one in three chance of consuming a carbohydrate beverage between two bouts of high-intensity exercise.; Participants have a one in three chance of consuming a carbohydrate-protein beverage between two bouts of high-intensity exercise.; Participants have a one in three chance of consuming a placebo beverage between two bouts of high-intensity exercise.
Other intervention name(s): CHO; CHO-P; PLA
Allocation: Randomized
Intervention model: Parallel Assignment
Intervention model description: Participants will be randomized to one of three groups: isocaloric carbohydrate (1.2 g/kg of body weight), carbohydrate-protein (0.8 g/kg body weight carbohydrate + 0.4 g/kg body weight protein), or placebo (flavored water). All three beverages will have a similar appearance and taste and participants will be blinded to the contents. All beverages will contain the same volume of fluid (1 liter).
Masking: Double (Participant, Outcomes Assessor)
Primary purpose: Other
Keywords: glycogen; glucose; aerobic exercise; time to exhaustion; supplementation; protein; endurance; recovery