scholarly journals Nutrient Timing Revisited: Is there a Post-Exercise Anabolic Window?

2013 ◽  
pp. 99-124
Keyword(s):  
Post Exercise ◽  
Nutrient Timing ◽  
Anabolic Window

scholarly journals Pre- versus post-exercise protein intake has similar effects on muscular adaptations

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e2825 ◽  
Author(s):  
Brad Jon Schoenfeld ◽  
Alan Aragon ◽  
Colin Wilborn ◽  
Stacie L. Urbina ◽  
Sara E. Hayward ◽  
...  
Keyword(s):  
Body Composition ◽  
Muscle Strength ◽  
Protein Intake ◽  
Post Exercise ◽  
Equal Dose ◽  
Baseline Testing ◽  
University Population ◽  
Total Body ◽  
Anabolic Window ◽  
Composition Changes

The purpose of this study was to test the anabolic window theory by investigating muscle strength, hypertrophy, and body composition changes in response to an equal dose of protein consumed either immediately pre- versus post-resistance training (RT) in trained men. Subjects were 21 resistance-trained men (>1 year RT experience) recruited from a university population. After baseline testing, participants were randomly assigned to 1 of 2 experimental groups: a group that consumed a supplement containing 25 g protein and 1 g carbohydrate immediately prior to exercise (PRE-SUPP) (n = 9) or a group that consumed the same supplement immediately post-exercise (POST-SUPP) (n = 12). The RT protocol consisted of three weekly sessions performed on non-consecutive days for 10 weeks. A total-body routine was employed with three sets of 8–12 repetitions for each exercise. Results showed that pre- and post-workout protein consumption had similar effects on all measures studied (p > 0.05). These findings refute the contention of a narrow post-exercise anabolic window to maximize the muscular response and instead lends support to the theory that the interval for protein intake may be as wide as several hours or perhaps more after a training bout depending on when the pre-workout meal was consumed.

scholarly journals Nutrient Timing: A Garage Door of Opportunity?

Nutrients ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1948 ◽  
Author(s):  
Shawn M. Arent ◽  
Harry P. Cintineo ◽  
Bridget A. McFadden ◽  
Alexa J. Chandler ◽  
Michelle A. Arent
Keyword(s):  
Improve Performance ◽  
Impact Performance ◽  
Nutrient Timing ◽  
Time Period ◽  
Nutrient Consumption ◽  
Performance Recovery ◽  
New Perspective ◽  
Definition Of ◽  
The Impact ◽  
Anabolic Window

Nutrient timing involves manipulation of nutrient consumption at specific times in and around exercise bouts in an effort to improve performance, recovery, and adaptation. Its historical perspective centered on ingestion during exercise and grew to include pre- and post-training periods. As research continued, translational focus remained primarily on the impact and outcomes related to nutrient consumption during one specific time period to the exclusion of all others. Additionally, there seemed to be increasing emphasis on outcomes related to hypertrophy and strength at the expense of other potentially more impactful performance measures. As consumption of nutrients does not occur at only one time point in the day, the effect and impact of energy and macronutrient availability becomes an important consideration in determining timing of additional nutrients in and around training and competition. This further complicates the confining of the definition of “nutrient timing” to one very specific moment in time at the exclusion of all other time points. As such, this review suggests a new perspective built on evidence of the interconnectedness of nutrient impact and provides a pragmatic approach to help frame nutrient timing more inclusively. Using this approach, it is argued that the concept of nutrient timing is constrained by reliance on interpretation of an “anabolic window” and may be better viewed as a “garage door of opportunity” to positively impact performance, recovery, and athlete availability.

The Basis for the Increase in Factor VIII Procoagulant Activity During Exercise

1983 ◽  
Vol 49 (01) ◽  
pp. 053-057 ◽  
Author(s):  
Robert G Kopitsky ◽  
Mary Ellen P Switzer ◽  
R Sanders Williams ◽  
Patrick A McKee
Keyword(s):  
Factor Viii ◽  
Acute Exercise ◽  
Post Exercise ◽  
Fviii Activity ◽  
Plasma Factor ◽  
The Subject ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Healthy Males ◽  
Related Increase

SummaryWe studied the effect of acute exercise on the ability of thrombin to activate plasma factor VIII (FVIII) activity in 20 healthy males. The subject showed an average exercise-related increase in FVIII activity of 54.5±8.2% over pre-exercise FVIII activity (p<0.001). When exposed to the same concentration of thrombin, post-exercise FVIII activity showed greater enhancement than pre-exercise FVIII activity: 157.1±12.8% increase in activity versus 117.3±9.9%, respectively (p<0.01). The degree of the potentiated thrombin effect in post-exercise samples relative to pre-exercise samples was linearly correlated with the degree of the exercise-related increase in FVIII activity. Taken together with our previous observations that the extent of thrombin enhancement of FVIII activity varies inversely with the mole ratio of FVIII/von Willebrand factor subunits to thrombin, these findings imply that release of FVIII does not occur during exercise, and that the exercise-related increase in FVIII activity results primarily, if not completely, from activation of already circulating but inactive FVIII.

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