The effect of a whey protein supplement dose on satiety and food intake in resistance training athletes.

Appetite

PubMedID: 25979566

MacKenzie-Shalders K, Byrne N, Slater G, King N. The effect of a whey protein supplement dose on satiety and food intake in resistance training athletes. Appetite. 2015;.
OBJECTIVE
Many athletes perform resistance training and consume dietary protein as a strategy to promote anabolic adaptation. Due to its high satiety value, the regular addition of supplemented dietary protein could plausibly displace other key macronutrients such as carbohydrate in an athlete's diet. This effect will be influenced by the form and dose of protein. Therefore, this study assessed the impact of liquid whey protein dose manipulation on subjective sensations of appetite and food intake in a cohort of athletes.

DESIGN
Ten male athletes who performed both resistance and aerobic (endurance) training (21.2?±?2.3 years; 181.7?±?5.7?cm and 80.8?±?6.1?kg) were recruited. In four counter-balanced testing sessions they consumed a manipulated whey protein supplement (20, 40, 60 or 80?g protein) 1 hour after a standardised breakfast. Subsequent energy intake was measured 3 hours after the protein supplement using an ad libitum test meal. Subjective appetite sensations were measured periodically during the test day using visual analogue scales.

RESULTS
All conditions resulted in a significant decrease in ratings of hunger (50-65%; P?
CONCLUSION
Increasing whey protein supplement dose above 20?g did not result in a measurable increase in satiety or decrease in food intake. However, the inclusion of additional whey protein supplementation where not otherwise consumed could plausibly reduce dietary intake.