RPM and Erections?
- 08-08-2007, 06:43 AM
- 08-08-2007, 06:55 AM
never triedbut stimulants always make me less 'functional' down there. however RPM contains arginine so that's always a plus
- 08-08-2007, 06:57 AM
08-08-2007, 08:44 AM
J Huazhong Univ Sci Technolog Med Sci. 2006;26(4):460-2.
Effect of icariin on cyclic GMP levels and on the mRNA expression of cGMP-binding cGMP-specific phosphodiesterase (PDE5) in penile cavernosum.
Jiang Z, Hu B, Wang J, Tang Q, Tan Y, Xiang J, Liu J.
Department of Pharmacology, School of Basic Medical Sciences, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
To further investigate the mechanisms of action of icariin (ICA), we assessed the effects of ICA on the in vitro formation of cGMP and cAMP in isolated rabbit corpus cavernosum. Isolated segments of rabbit corpus cavernosum were exposed to increasing concentrations of ICA and the dose-dependent accumulation of cGMP and cAMP was determined in the tissues samples by means of 125I radioimmunoassay. Responses of the isolated tissues preparations to ICA were compared with those obtained with the reference compounds sildenafil (Sild). Furthermore, the effects of ICA on the mRNA expression of specific cGMP-binding phosphodiesterase type V (PDE5) in rat penis were also observed. After incubation with ICA for 6 h or 14 h respectively, the levels of PDE5 mRNA were examined by reverse transcriptase polymerase chain reaction (RT-PCR). The results showed that ICA increased cGMP concentrations directly (P < 0.05), but there was no significant effect on cAMP concentrations (P > 0.05). In the presence of sodium nitroprusside (SNP), a stimulatory agent of cGMP, both ICA and Sild increased cGMP concentrations with increasing dose (P < 0.01). Their EC50 was 4.62 (ICA) and 0.42 (Sild) micromol/L respectively. Under the same condition, ICA and Sild unaltered cAMP level significantly (P > 0.05). There were PDE5A1 and PDE5A2 mRNA expressions in rat corpus cavernosum with PDE5A2 being the dominant isoform. ICA could obviously inhibit these two isoforms mRNA expression in rat penis, and decrease PDE5A1 more pronouncedly (P < 0.01). The present study indicated that the aphrodisiac mechanisms of icariin involved the NO-cGMP signal transduction pathway, with increasing cGMP levels in the corpus cavernosum smooth muscle. The inhibitory effect of icariin on PDE5 mRNA expression, especially on PDE5A1, might account for its molecular mechanisms for its long-term activity.
Asian J Androl. 2005 Dec;7(4):381-8.Click here to read Links
Effects of icariin on erectile function and expression of nitric oxide synthase isoforms in castrated rats.
Liu WJ, Xin ZC, Xin H, Yuan YM, Tian L, Guo YL.
Andrology Center of Peking University First Hospital, Beijing 100009, China.
AIM: To investigate the effect of icariin on erectile function and the expression of nitric oxide synthase (NOS) isoforms in castrated rats. METHODS: Thirty-two adult male Wistar rats were randomly divided into one sham-operated group (A) and three castrated groups (B, C and D). One week after surgery, rats were treated with normal saline (groups A and B) or oral icariin (1 mg/[kg.day] for group C and 5 mg/[kg.day] for group D) for 4 weeks. One week after treatment, the erectile function of the rats was assessed by measuring intracavernosal pressure (ICP) during electrostimulation of the cavernosal nerve. The serum testosterone (ST) levels, the percent of smooth muscle (PSM) in trabecular tissue, and the expression of mRNA and proteins of neuronal nitric oxide synthase (nNOS), inducible nitric oxide synthase (iNOS), endothelial nitric oxide synthase (eNOS) and phosphodiesterase V (PDE5) in corpus cavernosum (CC) were also evaluated. RESULTS: ICP, PSM, ST and the expression of nNOS, iNOS, eNOS and PDE5 were significantly decreased in group B compared with those in group A (P 0.01). However, ICP, PSM and the expression of nNOS and iNOS were increased in groups C and D compared with those in group B (P 0.05). Changes in ST and the expression of eNOS and PDE5 were not significant (P 0.05) in groups C and D compared with those in group B. CONCLUSION: Oral treatment with icariin ( 98.6 % purity) for 4 weeks potentially improves erectile function. This effect is correlated with an increase in PSM and the expression of certain NOS in the CC of castrated rats. These results suggest that icariin may have a therapeutic effect on erectile dysfunction.
J Biomed Biotechnol. 2004;2004(5):272-278.Click here to read Links
Effect of Grape Seed Extract and Quercetin on Cardiovascular and Endothelial Parameters in High-Risk Subjects.
Grape seed extract (GSE) has in vitro antioxidant activity but whether or not it works in vivo is not clear. In a fully randomised, crossover trial with 4-week treatment periods on 36 men and women with above-average vascular risk, we aimed to demonstrate that 2 g/day of GSE (1 g of polyphenols) alone, or with 1 g/day of added quercetin in yoghurt, favourably alters vascular function, endothelial function, and degree of oxidative damage in comparison to a control yoghurt. GSE alone improved flow-mediated dilatation determined ultrasonically by an absolute $1.1$ % compared with control. There was no effect of the combination of GSE with quercetin. No other blood or urine measure was altered. Thus sufficient polyphenols from GSE appear to be absorbed to influence endothelial nitric oxide production, and GSE has the potential to favourably influence vascular function.
Dirk Tanis, BA, MSci
Chief Operating Officer, Applied Nutriceuticals
08-08-2007, 11:40 AM
08-08-2007, 05:04 PM
08-08-2007, 05:05 PM
08-08-2007, 05:09 PM
08-08-2007, 05:23 PM
08-08-2007, 09:41 PM
08-08-2007, 09:57 PM
forget about anabolic drive erections... I wore myself out this last weekend got to the "ok, thats enough please stop" point from my wife
08-10-2007, 03:34 AM
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