Vitamina C y vitamina E disminuyen ganancias musculares

Foro general ciencia, medicina, nutrición, salud pública, política

Moderador: Fisio

Vitamina C y vitamina E disminuyen ganancias musculares

Notapor Fisio » Lun, 06 Jul 2015, 17:17

Ya teníamos estudios que mostraban que los antioxidantes impedían las adaptaciones celulares en el músculo esquelético. En mayores a 12 semanas se ven menores ganancias tomando 1 gr de vit C y vit E perientreno.

Vitamin C and E supplementation blunts increases in total lean body mass in elderly men after strength training

The aim of this study was to investigate the effects of vitamin C and E supplementation on changes in muscle mass (lean mass and muscle thickness) and strength during 12 weeks of strength training in elderly men. Thirty-four elderly males (60–81 years) were randomized to either an antioxidant group (500 mg of vitamin C and 117.5 mg vitamin E before and after training) or a placebo group following the same strength training program (three sessions per week). Body composition was assessed with dual-energy X-ray absorptiometry and muscle thickness by ultrasound imaging. Muscle strength was measured as one-repetition maximum (1RM). Total lean mass increased by 3.9% (95% confidence intervals: 3.0, 5.2) and 1.4% (0, 5.4) in the placebo and antioxidant groups, respectively, revealing larger gains in the placebo group (P = 0.04). Similarly, the thickness of m. rectus femoris increased more in the placebo group [16.2% (12.8, 24.1)] than in the antioxidant group [10.9% (9.8, 13.5); P = 0.01]. Increases of lean mass in trunk and arms, and muscle thickness of elbow flexors, did not differ significantly between groups. With no group differences, 1RM improved in the range of 15–21% (P < 0.001). In conclusion, high-dosage vitamin C and E supplementation blunted certain muscular adaptations to strength training in elderly men.


http://onlinelibrary.wiley.com/doi/10.1 ... 6/abstract

Los que van a entrenar con el Animal Pack y todo eso... anda que como encima no es caro :?
Avatar de Usuario
Fisio
Administrador del Sitio
 
Mensajes: 5275
Registrado: Dom, 01 Sep 2013, 14:18

Re: Vitamina C y vitamina E disminuyen ganancias musculares

Notapor Fisio » Lun, 06 Jul 2015, 17:37

Vitamin C and E supplementation alters protein signalling after a strength training session, but not muscle growth during 10 weeks of training.
Paulsen G1, Hamarsland H2, Cumming KT2, Johansen RE2, Hulmi JJ3, Børsheim E4, Wiig H2, Garthe I5, Raastad T2.
Author information
Abstract

This study investigated the effects of vitamin C and E supplementation on acute responses and adaptations to strength training. Thirty-two recreationally strength-trained men and women were randomly allocated to receive a vitamin C and E supplement (1000 mg day(-1) and 235 mg day(-1), respectively), or a placebo, for 10 weeks. During this period the participants' training involved heavy-load resistance exercise four times per week. Muscle biopsies from m. vastus lateralis were collected, and 1 repetition maximum (1RM) and maximal isometric voluntary contraction force, body composition (dual-energy X-ray absorptiometry), and muscle cross-sectional area (magnetic resonance imaging) were measured before and after the intervention. Furthermore, the cellular responses to a single exercise session were assessed midway in the training period by measurements of muscle protein fractional synthetic rate and phosphorylation of several hypertrophic signalling proteins. Muscle biopsies were obtained from m. vastus lateralis twice before, and 100 and 150 min after, the exercise session (4 × 8RM, leg press and knee-extension). The supplementation did not affect the increase in muscle mass or the acute change in protein synthesis, but it hampered certain strength increases (biceps curl). Moreover, increased phosphorylation of p38 mitogen-activated protein kinase, Extracellular signal-regulated protein kinases 1 and 2 and p70S6 kinase after the exercise session was blunted by vitamin C and E supplementation. The total ubiquitination levels after the exercise session, however, were lower with vitamin C and E than placebo. We concluded that vitamin C and E supplementation interfered with the acute cellular response to heavy-load resistance exercise and demonstrated tentative long-term negative effects on adaptation to strength training.


http://www.ncbi.nlm.nih.gov/pubmed/25384788


Los resultados pueden cambiar según la forma de administración. Este estudio habla de entre 1 y 3 horas antes de entrenar. No es lo mismo dependiendo de la saturación, y también solo tuvieron 2 semanas de descanso de suplementos previos.
Avatar de Usuario
Fisio
Administrador del Sitio
 
Mensajes: 5275
Registrado: Dom, 01 Sep 2013, 14:18

Re: Vitamina C y vitamina E disminuyen ganancias musculares

Notapor kewhiro » Jue, 09 Jul 2015, 14:14

El "recreational" marca estilo no? Demasiadas variables para aplicar.
P.d. tienes un mp por un problema con usuario inactivado. Puedes echarle un ojo? Gracias!

Enviado desde mi Aquaris E4.5 mediante Tapatalk
kewhiro
 


Volver a Muscleblog

¿Quién está conectado?

Usuarios navegando por este Foro: No hay usuarios registrados visitando el Foro y 3 invitados
cron