Whey protein consumption after resistance exercise reduces energy intake at a post-exercise meal.
OBJECTIVE
Protein consumption after resistance exercise potentiates muscle protein synthesis, but its effects on subsequent appetite in this context are unknown. This study examined appetite and energy intake following consumption of protein- and carbohydrate-containing drinks after resistance exercise.


METHODS
After familiarisation, 15 resistance training males (age 21 ± 1 years, body mass 78.0 ± 11.9 kg, stature 1.78 ± 0.07 m) completed two randomised, double-blind trials, consisting of lower-body resistance exercise, followed by consumption of a whey protein (PRO 23.9 ± 3.6 g protein) or dextrose (CHO 26.5 ± 3.8 g carbohydrate) drink in the 5 min post-exercise. An ad libitum meal was served 60 min later, with subjective appetite measured throughout. Drinks were flavoured and matched for energy content and volume. The PRO drink provided 0.3 g/kg body mass protein.


RESULTS
Ad libitum energy intake (PRO 3742 ± 994 kJ; CHO 4172 ± 1132 kJ; P = 0.007) and mean eating rate (PRO 339 ± 102 kJ/min; CHO 405 ± 154 kJ/min; P = 0.009) were lower during PRO. The change in eating rate was associated with the change in energy intake (R = 0.661, P = 0.007). No interaction effects were observed for subjective measures of appetite. The PRO drink was perceived as creamier and thicker, and less pleasant, sweet and refreshing (P < 0.05).


CONCLUSIONS
These results suggest whey protein consumption after resistance exercise reduces subsequent energy intake, and this might be partially mediated by a reduced eating rate. Whilst this reduced energy intake is unlikely to impair hypertrophy, it may be of value in supporting an energy deficit for weight loss.
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK.
Alistair
A
Monteyne
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK.
Alex
A
Martin
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK.
Liam
L
Jackson
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK.
Nick
N
Corrigan
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK.
Ellen
E
Stringer
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK.
Jack
J
Newey
Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK.
Penny L S
PLS
Rumbold
Institute of Cellular Medicine, Human Nutrition Research Centre, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK.
Emma J
EJ
Stevenson
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, LE11 3TU, UK. L.James@lboro.ac.uk.
Lewis J
LJ
James
D000328:Adult; D001067:Appetite Depressants / Q000008:administration & dosage* / Q000627:therapeutic use; D001069:Appetite Regulation; D001628:Beverages; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004311:Double-Blind Method; D061215:Energy Drinks; D002149:Energy Intake; D005247:Feeding Behavior; D005518:Food Preferences; D005947:Glucose / Q000008:administration & dosage; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D055070:Resistance Training; D062410:Snacks; D064133:Sports Nutritional Physiological Phenomena; D013997:Time Factors; D000067816:Whey Proteins / Q000008:administration & dosage*; D055815:Young Adult
D001067:Appetite Depressants; D004040:Dietary Carbohydrates; D000067816:Whey Proteins; D005947:Glucose
Anabolism; Appetite; Body composition; Energy balance; Protein synthesis; Weight management