Increased Protein Intake Reduces Lean Body Mass Loss during Weight Loss in Athletes.

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Increased Protein Intake Reduces Lean Body Mass Loss during Weight Loss in Athletes. / Mettler, S; Mitchell, N; Tipton, Kevin.

In: Medicine and Science in Sports and Exercise, 13.11.2009.

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@article{60e203dd82424c85bb3ff0c25ee6b153,
title = "Increased Protein Intake Reduces Lean Body Mass Loss during Weight Loss in Athletes.",
abstract = "PURPOSE:: To examine the influence of dietary protein on lean body mass loss and performance during short-term hypoenergetic weight loss in athletes. METHODS:: In a parallel design, 20 healthy, young resistance trained athletes were examined for energy expenditure for one week and fed a mixed diet (15% protein, 100% energy) in the second week, followed by a hypoenergetic diet (60% of the habitual energy intake), containing either 15% (~1.0g.kg) protein (control group, n=10; CP) or 35% (~2.3 g.kg) protein (high protein group, n=10; HP) for two weeks. Subjects continued their habitual training throughout the study. Total, lean body and fat mass, performance (squat jump, maximal isometric leg extension, one repetition maximum bench press, muscle endurance bench press and 30 sec wingate test) and fasting blood samples (glucose, non esterified fatty acids (NEFA), glycerol, urea, cortisol, free testosterone, free IGF-1 and growth hormone) and psychological measures were examined at the end of each of the four weeks. RESULTS:: Total (-3.0 +/- 0.4 kg and -1.5 +/- 0.3 kg for the CP and HP, respectively, p=0.036) and lean body mass loss (-1.6 +/- 0.3 kg and -0.3 +/- 0.3 kg, p=0.006) were significantly larger in the CP compared to the HP. Fat loss, performance and most blood parameters were not influenced by the diet. Urea was higher in HP and NEFA and urea showed a group*time interaction. Fatigue ratings and 'worse than normal' scores on the DALDA were higher in HP. CONCLUSION:: These results indicate that ~2.3 g.kg-1 or ~35% protein was significantly superior to ~1.0 g.kg-1 or ~15% energy protein for maintenance of lean body mass in healthy young athletes during short-term, hypoenergetic weight loss.",
keywords = "EXERCISE, PERFORMANCE, NUTRITION, BODY COMPOSITION",
author = "S Mettler and N Mitchell and Kevin Tipton",
year = "2009",
month = nov,
day = "13",
doi = "10.1249/MSS.0b013e3181b2ef8e",
language = "English",
journal = "Medicine and Science in Sports and Exercise",
issn = "0195-9131",
publisher = "American College of Sports Medicine",

}

RIS

TY - JOUR

T1 - Increased Protein Intake Reduces Lean Body Mass Loss during Weight Loss in Athletes.

AU - Mettler, S

AU - Mitchell, N

AU - Tipton, Kevin

PY - 2009/11/13

Y1 - 2009/11/13

N2 - PURPOSE:: To examine the influence of dietary protein on lean body mass loss and performance during short-term hypoenergetic weight loss in athletes. METHODS:: In a parallel design, 20 healthy, young resistance trained athletes were examined for energy expenditure for one week and fed a mixed diet (15% protein, 100% energy) in the second week, followed by a hypoenergetic diet (60% of the habitual energy intake), containing either 15% (~1.0g.kg) protein (control group, n=10; CP) or 35% (~2.3 g.kg) protein (high protein group, n=10; HP) for two weeks. Subjects continued their habitual training throughout the study. Total, lean body and fat mass, performance (squat jump, maximal isometric leg extension, one repetition maximum bench press, muscle endurance bench press and 30 sec wingate test) and fasting blood samples (glucose, non esterified fatty acids (NEFA), glycerol, urea, cortisol, free testosterone, free IGF-1 and growth hormone) and psychological measures were examined at the end of each of the four weeks. RESULTS:: Total (-3.0 +/- 0.4 kg and -1.5 +/- 0.3 kg for the CP and HP, respectively, p=0.036) and lean body mass loss (-1.6 +/- 0.3 kg and -0.3 +/- 0.3 kg, p=0.006) were significantly larger in the CP compared to the HP. Fat loss, performance and most blood parameters were not influenced by the diet. Urea was higher in HP and NEFA and urea showed a group*time interaction. Fatigue ratings and 'worse than normal' scores on the DALDA were higher in HP. CONCLUSION:: These results indicate that ~2.3 g.kg-1 or ~35% protein was significantly superior to ~1.0 g.kg-1 or ~15% energy protein for maintenance of lean body mass in healthy young athletes during short-term, hypoenergetic weight loss.

AB - PURPOSE:: To examine the influence of dietary protein on lean body mass loss and performance during short-term hypoenergetic weight loss in athletes. METHODS:: In a parallel design, 20 healthy, young resistance trained athletes were examined for energy expenditure for one week and fed a mixed diet (15% protein, 100% energy) in the second week, followed by a hypoenergetic diet (60% of the habitual energy intake), containing either 15% (~1.0g.kg) protein (control group, n=10; CP) or 35% (~2.3 g.kg) protein (high protein group, n=10; HP) for two weeks. Subjects continued their habitual training throughout the study. Total, lean body and fat mass, performance (squat jump, maximal isometric leg extension, one repetition maximum bench press, muscle endurance bench press and 30 sec wingate test) and fasting blood samples (glucose, non esterified fatty acids (NEFA), glycerol, urea, cortisol, free testosterone, free IGF-1 and growth hormone) and psychological measures were examined at the end of each of the four weeks. RESULTS:: Total (-3.0 +/- 0.4 kg and -1.5 +/- 0.3 kg for the CP and HP, respectively, p=0.036) and lean body mass loss (-1.6 +/- 0.3 kg and -0.3 +/- 0.3 kg, p=0.006) were significantly larger in the CP compared to the HP. Fat loss, performance and most blood parameters were not influenced by the diet. Urea was higher in HP and NEFA and urea showed a group*time interaction. Fatigue ratings and 'worse than normal' scores on the DALDA were higher in HP. CONCLUSION:: These results indicate that ~2.3 g.kg-1 or ~35% protein was significantly superior to ~1.0 g.kg-1 or ~15% energy protein for maintenance of lean body mass in healthy young athletes during short-term, hypoenergetic weight loss.

KW - EXERCISE

KW - PERFORMANCE

KW - NUTRITION

KW - BODY COMPOSITION

U2 - 10.1249/MSS.0b013e3181b2ef8e

DO - 10.1249/MSS.0b013e3181b2ef8e

M3 - Article

C2 - 19927027

JO - Medicine and Science in Sports and Exercise

JF - Medicine and Science in Sports and Exercise

SN - 0195-9131

ER -