Inga androgena eller östrogena effekter av sojaprotein hos styrketränande män

[King Grub]

It is currently unclear as to whether sex hormones are significantly affected by soy or whey protein consumption. Additionally, estrogenic signaling may be potentiated via soy protein supplementation due to the presence of phytoestrogenic isoflavones. Limited also evidence suggests that whey protein supplementation may increase androgenic signaling. Therefore, the purpose of this study was to examine the effects of soy protein concentrate (SPC), whey protein concentrate (WPC), or placebo (PLA) supplementation on serum sex hormones, androgen signaling markers in muscle tissue, and estrogen signaling markers in subcutaneous (SQ) adipose tissue of previously untrained, college-aged men (n = 47, 20 ± 1 yrs) that resistance trained for 12 weeks. Fasting serum total testosterone increased pre- to post-training, but more so in subjects consuming WPC (p < 0.05), whereas serum 17β-estradiol remained unaltered. SQ estrogen receptor alpha (ERα) protein expression and hormone-sensitive lipase mRNA increased with training regardless of supplementation. Muscle androgen receptor (AR) mRNA increased while ornithine decarboxylase mRNA (a gene target indicative of androgen signaling) decreased with training regardless of supplementation (p < 0.05). No significant interactions of supplement and time were observed for adipose tissue ERα/β protein levels, muscle tissue AR protein levels, or mRNAs in either tissue indicative of altered estrogenic or androgenic activity. Interestingly, WPC had the largest effect on increasing type II muscle fiber cross sectional area values (Cohen's d = 1.30), whereas SPC had the largest effect on increasing this metric in type I fibers (Cohen's d = 0.84). These data suggest that, while isoflavones were detected in SPC, chronic WPC or SPC supplementation did not appreciably affect biomarkers related to muscle androgenic signaling or SQ estrogenic signaling. The noted fiber type-specific responses to WPC and SPC supplementation warrant future research.

Sci Rep. 2018 Jul 24;8(1):11151. Soy protein supplementation is not androgenic or estrogenic in college-aged men when combined with resistance exercise training.

[Status Quo]

Hur uppstår då sojapojkseffekten?

[Sverker]

Vad är det ?

[Status Quo]

Vad är det ?

https://www.urbandictionary.com/define.php?term=Soy%20Boy

[RassK]

https://www.urbandictionary.com/define.php?term=Soy%20Boy

Dör :laugh:

[Sverker]

Mer tragiskt tycker jag.

Skrev detta för ett par år sedan http://www.kolozzeum.com/forum/showpost.php?p=6974322&postcount=2

[Tisu]

Om soja skulle ha en hormonell påverkan med avseende på ökade östrogen nivåer eller däråt blir tesen att soja ökar risken för bröstcancer. Nu visar litteraturen att så inte är fallet. Om något minskar risken för bröstcancer.

[Sverker]

Vilket jag skrev tidigare. Blockerar men aktiverar inte.

[Hobbes]

Author Correction: Soy protein supplementation is not androgenic or estrogenic in college-aged men when combined with resistance exercise training (https://www.nature.com/articles/s41598-018-30574-8)

Correction to: Scientific Reports https://doi.org/10.1038/s41598-018-29591-4, published online 24 July 2018

The original version of this Article contained errors.

In the Abstract,

“Limited also evidence suggests that whey protein supplementation may increase androgenic signaling.”

now reads:

“Limited evidence suggests that whey protein supplementation may increase androgenic signaling.”

In the Results,

“No datum from PLA estradiol levels at PRE met criteria for outlier removal and given that all other levels were normally distributed.”

now reads:

“No datum from PLA estradiol levels at PRE met criteria for outlier removal so statistical analysis proceeded.”

In the Discussion,

“Notwithstanding, more data are needed in order to determine the physiological role that ODC1 gene expression has on skeletal muscle physiology.”

now reads:

“Notwithstanding, more data are needed in order to determine the physiological role that ODC1 gene expression plays in skeletal muscle physiology.”

Finally, in the Discussion,

“Indeed, this is a relatively novel finding and it could implicate the differential role that each protein source has on promoting fiber type-specific hypertrophy.”

now reads:

“Indeed, this is a relatively novel finding and it could implicate differential effects of each protein source on promoting fiber type-specific hypertrophy.”

These errors have now been corrected in the PDF and HTML versions of the Article.

[xan]

vad är det ?

:d