תזונה ותוספים Timing Protein Intake Increases Energy Expenditure 24 Hours Post-Resistance Training

[Mike Bikov]

Med Sci Sports Exerc. 2009 Dec 4. [Epub ahead of print]

Timing Protein Intake Increases Energy Expenditure 24 Hours Post-Resistance Training.

Hackney KJ, Bruenger AJ, Lemmer JT.

1Department of Kinesiology, Michigan State University, East Lansing, MI 2Department of Kinesiology and Physical Education, University of Central Arkansas, Conway, AR 3Department of Movement Science, Grand Valley State University, Allendale, MI 4Department Exercise Science, Syracuse University, Syracuse, NY.

PURPOSE:: To determine if protein supplementation (PRO) prior to an acute bout of heavy resistance training (HRT) would influence post-exercise resting energy expenditure (REE) and the non-protein respiratory exchange ratio (RER). Hypothesis: REE would be increased and RER would be decreased up to 48 hours following timed PRO and HRT compared to carbohydrate supplementation (CHO) and HRT. METHODS:: Eight resistance-trained subjects (5M, 3W) participated in a double-blind, two trial crossover design, where REE and RER were measured (7:00am) on four consecutive days. On the second day of trial one, subjects consumed 376 KJ of either PRO (18g whey protein, 2g carbohydrate, 1.5g fat) or CHO (1g whey protein, 19g carbohydrate, 1g fat) 20 minutes prior to a single bout of HRT (9 exercises, 4 sets, 70-75% 1RM). REE and RER were measured 24 and 48 hours post-HRT. During trial two, the same protocol was followed except subjects consumed the second supplement prior to HRT. RESULTS:: Compared with baseline, REE was elevated significantly in both CHO and PRO at 24 and 48 hours post-HRT (p < 0.05). At 24 hours post-HRT, REE in response to PRO was significantly greater compared to CHO (p < 0.05). RER decreased significantly in both CHO and PRO at 24 hours post-HRT compared to baseline (p < 0.05). No differences were observed in total energy intake, macronutrient intake, or HRT volume (p > 0.05). CONCLUSION:: Timing PRO prior to HRT may be a simple and effective strategy to increase energy expenditure by elevating REE the day after HRT. Increasing REE could facilitate reductions in body fat mass and improve body composition if nutritional intake is stable.​

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[אבי כהן]

לא ברור לי מה ההבדל בין trial one לבין trial two.

בראשון, כתוב שצרכו את המזון 20 דק' לפני האימון
ובשני, כתוב שצרכו את המזון "לפני" האימון.

 

[Mike Bikov]

לפני האימון הכוונה ממש לפני האימון עצמו, הם סיימו את מה שהביאו להם לאכול וישר התחילו את הפרוטוקול, הצוות הראשון חיכה 20 דקות לפני שהתחיל.

 

[אבי כהן]

וואלה...מוזר שפער של מקס' 20 דק' מביא לתוצאות מובהקות..ומוזר לי גם שהם לא טרחו להדגיש בבירור
שה 20 דק' האלה זה ההבדל בין שני הטריאלים.
זה נשמע לך הגיוני?
הצצת במחקר המלא בכדי להבין שזה אכן השוני בין שני הצוותים?