Arginine...conseils !!!!

[ZenBody]

Bonjour à tous,


Je me pose une question sur l arginine :

Est il nécessaire de la prendre individuellement (vu avec autres complèments tels bcaa...normalement l action devrait favorise la croissance musculaire et la réparation des tissus) soit en comprimé ou ampoules...!!

Ou cela ne sert à rien !!!

[Criti]

ça sert à mieux congestionner, après à savoir si c'est utile pour la croissance...

[Alban]

Congestionner, oui, mais surtout le compte en banque des vendeurs


J Nutr. 2010 Dec 29. [Epub ahead of print]
Bolus Arginine Supplementation Affects neither Muscle Blood Flow nor Muscle Protein Synthesis in Young Men at Rest or After Resistance Exercise.

Tang JE, Lysecki PJ, Manolakos JJ, Macdonald MJ, Tarnopolsky MA, Phillips SM.

Department of Kinesiology, Exercise Metabolism Research Group, McMaster University, Hamilton, ON L8S 4K1, Canada.
Abstract

The aim of this study was to investigate the ergogenic potential of arginine on NO synthesis, muscle blood flow, and skeletal muscle protein synthesis (MPS). Eight healthy young men (22.1 ± 2.6 y, 1.79 ± 0.06 m, 76.6 ± 6.2 kg; mean ± SD) participated in 2 trials where they performed a bout of unilateral leg resistance exercise and ingested a drink containing either 10 g essential amino acids with 10 g l-arginine (ARG) or an isonitrogenous control (idiot). Femoral artery blood flow of both the nonexercised and exercised leg was measured continuously using pulsed-wave Doppler ultrasound, while rates of mixed and myofibrillar MPS were determined using a primed continuous infusion of l-[ring-(13)C(6)] or l-[ring-(2)H(5)]phenylalanine. The plasma arginine concentration increased 300% during the ARG trial but not during the idiot trial (P < 0.001). Plasma nitrate, nitrite, and endothelin-1, all markers of NO synthesis, did not change during either the ARG or idiot trial. Plasma growth hormone increased to a greater degree after exercise in the ARG trial than idiot trial (P < 0.05). Femoral artery blood flow increased 270% above basal in the exercised leg (P < 0.001) but not in the nonexercised leg, with no differences between the ARG and idiot trials. Mixed and myofibrillar MPS were both greater in the exercised leg compared with the nonexercised leg (P < 0.001), but did not differ between the ARG and idiot treatments. We conclude that an oral bolus (10 g) of arginine does not increase NO synthesis or muscle blood flow. Furthermore, arginine does not enhance mixed or myofibrillar MPS either at rest or after resistance exercise beyond that achieved by feeding alone.

PMID: 21191143 [PubMed - as supplied by publisher]

[ed]

Oral arginine does not stimulate basal or augment exercise-induced GH secretion in either young or old adults.

Marcell TJ, Taaffe DR, Hawkins SA, Tarpenning KM, Pyka G, Kohlmeier L, Wiswell RA, Marcus R.

Department of Exercise Science, University of Southern California, Los Angeles, USA. marcellt@grc.nia.nih.gov
Abstract

BACKGROUND: Growth hormone (GH) helps maintain body composition and metabolism in adults. However, basal and peak GH decline with age. Exercise produces a physiologic GH response that is subnormal in elderly people. Arginine (Arg) infusion can augment GH secretion, but the efficacy of oral Arg to improve GH response to exercise has not been explored. We investigated whether oral Arg increases GH secretion in young and old people at rest and during exercise.

METHODS: Twenty young (Y: 22.1 +/- 0.9 y; SEM) and 8 old (O: 68.5 +/- 2.1 y) male and female subjects underwent three different trials following determination of their one-repetition maximum strength (1-RM); exercise only (EO; 3 sets, 8-10 reps at 85% of 1-RM; on 12 separate resistive lifts), Arg only (5.0 g), or Arg + exercise. Blood samples were collected between successive lifts, and GH (ng x ml(-1)) was determined via RIA.

RESULTS: In Y vs O: Basal GH secreted (area under the curve) was 543.6 +/- 84.0 vs 211.5 +/- 63.0. During EO, values were 986.6 +/- 156.6 and 517.8 +/- 85.5. Both were significantly lower in the older individuals (p < .05). Oral Arg alone did not result in any increase in GH secretion at rest (310.8 +/- 73.2 vs 262.9 +/- 141.2). When Arg was coadministered during exercise, GH release was not affected in either the young or old and appeared to be blunted in the young compared to the exercise only trial in the young.

CONCLUSION: Based upon these findings, we concluded that oral Arg does not stimulate GH secretion and may impair GH release during resistive exercise.

PMID: 10496544 [PubMed - indexed for MEDLINE]

[ZenBody]

Merci pour les infos.
Selon les 2 articles en anglais, aucune progression pour les MPS, en final peu convaincant.