כשהייתה תקלה בטעות עשיתי דאבל על נושא שפתחתי כי לא הבנתי שהייתה תקלה.
אך בכל מקרה משה אני צריך את עזרתך :
טוב לאחרונה יש לי מתאמנת שלומדת את תחום הרפואה ולא אחת יצא לנו להתווכח על חלון אנאבולי בסוף האימון שאותו שללתי והיא מצדיקה וטוענת שיש מחקרים המוכיחים זאת...
לאחר התכתבות קצרה במייל אני מעלה לפה את החומר כולל הקישור וצריך את דעתכם ועזרתכם בלאשש/לשלול את הדברים.
הקישור הגדול של JISSN למאמר אודות צריכת החלבון יש גם סעיפים שמדברים על הטיימינג של הצריכה ביחס לפעילות גופנית ומופיעים רפרנסים לפאב מאד.
http://www.jissn.com/content/4/1/8
עכשיו כמה רפרנסים מעניינים
עכשיו מחקר נוסף
האמנם?...
לאחר מכן הגיע זה
ועוד אחד...אולי לא לגמרי קשור אך
עכשיו שימו לב לקישור הבא של אדם בשם ג'ון הוסמן בעל תואר PHD שפותח את המאמר הבא:
http://www.hussmanfitness.org/html/TFPostProtein.html
בשורות האלו:
משה חשובה לי דעתך על הניירות עמדה הללו.. מה משמעותם? האם יש דברים לא רלוונטים שהוצאו מהקשרם?...
אך בכל מקרה משה אני צריך את עזרתך :
טוב לאחרונה יש לי מתאמנת שלומדת את תחום הרפואה ולא אחת יצא לנו להתווכח על חלון אנאבולי בסוף האימון שאותו שללתי והיא מצדיקה וטוענת שיש מחקרים המוכיחים זאת...
לאחר התכתבות קצרה במייל אני מעלה לפה את החומר כולל הקישור וצריך את דעתכם ועזרתכם בלאשש/לשלול את הדברים.
הקישור הגדול של JISSN למאמר אודות צריכת החלבון יש גם סעיפים שמדברים על הטיימינג של הצריכה ביחס לפעילות גופנית ומופיעים רפרנסים לפאב מאד.
http://www.jissn.com/content/4/1/8
עכשיו כמה רפרנסים מעניינים
Am J Physiol. 1995 Mar;268(3 Pt 1):E514-20.Increased rates of muscle protein turnover and amino acid transport after resistance exercise in humans.
Biolo G, Maggi SP, Williams BD, Tipton KD, Wolfe RR.
Source
Department of Internal Medicine, University of Texas Medical Branch, Galveston.
Abstract
The rates of protein synthesis and degradation and of amino acid transport were determined in the leg muscle of untrained postabsorptive normal volunteers at rest and approximately 3 h after a resistance exercise routine. The methodology involved use of stable isotopic tracers of amino acids, arteriovenous catheterization of the femoral vessels, and biopsy of the vastus lateralis muscle. During postexercise recovery, the rate of intramuscular phenylalanine utilization for protein synthesis increased above the basal value by 108 +/- 18%, whereas the rate of release from proteolysis increased by 51 +/- 17%. Muscle protein balance improved (P < 0.05) after exercise but did not become positive (from -15 +/- 12 to -6 +/- 3 nmol phenylalanine.min-1.100 ml leg volume-1). After exercise, rates of inward transport of leucine, lysine, and alanine increased (P < 0.05) above the basal state from 132 +/- 16 to 208 +/- 29, from 122 +/- 8 to 260 +/- 8, and from 384 +/- 71 to 602 +/- 89 nmol.min-1.100 ml leg-1, respectively. Transport of phenylalanine did not change significantly. These results indicate that, during recovery after resistance exercise, muscle protein turnover is increased because of an acceleration of synthesis and degradation. A postexercise acceleration of amino acid transport may contribute to the relatively greater stimulation of protein synthesis
עכשיו מחקר נוסף
Am J Physiol. 1997 Jul;273(1 Pt 1):E122-9.An abundant supply of amino acids enhances the metabolic effect of exercise on muscle protein.
Biolo G, Tipton KD, Klein S, Wolfe RR.
Source
Department of Metabolism, Shriners Burns Institute, Galveston, Texas, USA.
Abstract
Six normal untrained men were studied during the intravenous infusion of a balanced amino acid mixture (approximately 0.15 g.kg-1.h-1 for 3 h) at rest and after a leg resistance exercise routine to test the influence of exercise on the regulation of muscle protein kinetics by hyperaminoacidemia. Leg muscle protein kinetics and transport of selected amino acids (alanine, phenylalanine, leucine, and lysine) were isotopically determined using a model based on arteriovenous blood samples and muscle biopsy. The intravenous amino acid infusion resulted in comparable increases in arterial amino acid concentrations at rest and after exercise, whereas leg blood flow was 64 +/- 5% greater after exercise than at rest. During hyperaminoacidemia, the increases in amino acid transport above basal were 30-100% greater after exercise than at rest. Increases in muscle protein synthesis were also greater after exercise than at rest (291 +/- 42% vs. 141 +/- 45%). Muscle protein breakdown was not significantly affected by hyperminoacidemia either at rest or after exercise. We conclude that the stimulatory effect of exogenous amino acids on muscle protein synthesis is enhanced by prior exercise, perhaps in part because of enhanced blood flow. Our results imply that protein intake immediately after exercise may be more anabolic than when ingested at some later time.
PMID:9252488[PubMed - indexed for MEDLINE]
האמנם?...
לאחר מכן הגיע זה
Amino Acids. 2007;32(4):467-77. Epub 2006 Sep 20.Effects of resistance training and protein plus amino acid supplementation on muscle anabolism, mass, and strength.
Willoughby DS, Stout JR, Wilborn CD.
Source
Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas 76798, U.S.A. [email protected]
Abstract
This study examined 10 wks of resistance training and the ingestion of supplemental protein and amino acids on muscle performance and markers of muscle anabolism. Nineteen untrained males were randomly assigned to supplement groups containing either 20 g protein (14 g whey and casein protein, 6 g free amino acids) or 20 g dextrose placebo ingested 1 h before and after exercise for a total of 40 g/d. Participants exercised 4 times/wk using 3 sets of 6-8 repetitions at 85-90% of the one repetition maximum. Data were analyzed with two-way ANOVA (p < 0.05). The protein supplement resulted in greater increases in total body mass, fat-free mass, thigh mass, muscle strength, serum IGF-1, IGF-1 mRNA, MHC I and IIa expression, and myofibrillar protein. Ten-wks of resistance training with 20 g protein and amino acids ingested 1 h before and after exercise is more effective than carbohydrate placebo in up-regulating markers of muscle protein synthesis and anabolism along with subsequent improvements in muscle performance.
PMID:16988909[PubMed - indexed for MEDLINE]
ועוד אחד...אולי לא לגמרי קשור אך
Am J Physiol. 1999 Apr;276(4 Pt 1):E628-34.Postexercise net protein synthesis in human muscle from orally administered amino acids.
Tipton KD, Ferrando AA, Phillips SM, Doyle D Jr, Wolfe RR.
Source
Metabolism Unit, Shriners Burns Institute, and Departments of Surgery and Anesthesiology, University of Texas Medical Branch, Galveston, Texas 77550, USA.
Abstract
We examined the response of net muscle protein synthesis to ingestion of amino acids after a bout of resistance exercise. A primed, constant infusion of L-[ring-2H5]phenylalanine was used to measure net muscle protein balance in three male and three female volunteers on three occasions. Subjects consumed in random order 1 liter of 1) a mixed amino acid (40 g) solution (MAA), 2) an essential amino acid (40 g) solution (EAA), and 3) a placebo solution (PLA). Arterial amino acid concentrations increased approximately 150-640% above baseline during ingestion of MAA and EAA. Net muscle protein balance was significantly increased from negative during PLA ingestion (-50 +/- 23 nmol. min-1. 100 ml leg volume-1) to positive during MAA ingestion (17 +/- 13 nmol. min-1. 100 ml leg volume-1) and EAA (29 +/- 14 nmol. min-1. 100 ml leg volume-1; P < 0.05). Because net balance was similar for MAA and EAA, it does not appear necessary to include nonessential amino acids in a formulation designed to elicit an anabolic response from muscle after exercise. We concluded that ingestion of oral essential amino acids results in a change from net muscle protein degradation to net muscle protein synthesis after heavy resistance exercise in humans similar to that seen when the amino acids were infused.
PMID:10198297[PubMed - indexed for MEDLINE]
עכשיו שימו לב לקישור הבא של אדם בשם ג'ון הוסמן בעל תואר PHD שפותח את המאמר הבא:
http://www.hussmanfitness.org/html/TFPostProtein.html
בשורות האלו:
The Journal of Physiology recently reported a study that tracked 13 subjects over 12 weeks. One group took a protein-containing supplement immediately after resistance training. The other waited for 2 hours before taking protein. The immediate protein group saw significant increases in muscle mass, dynamic strength (strength in moving a weight) and isometric strength (strength without movement). The 2-hour delay group saw only improved dynamic strength. The study notes "We conclude that an early intake of an oral protein supplement after resistance training is important for the development of hypertrophy in skeletal muscle.
משה חשובה לי דעתך על הניירות עמדה הללו.. מה משמעותם? האם יש דברים לא רלוונטים שהוצאו מהקשרם?...
נערך לאחרונה: