https://doi.org/10.3164/jcbn.19-124 (full text, English language, 2020)
>Androgen hormones are important compounds related to body composition and exercise performance in athletes. The intake of Dioscorea esculenta, known as lesser yam, contains diosgenin and resistance training have been shown to normalize the secretion of androgen hormones. This study aimed to clarify the level of androgen hormone secretion and the effects of Dioscorea esculenta intake with resistance training on muscle hypertrophy and strength in athletes. First, in a cross-sectional study, we compared the serum androgen hormone [dehydroepiandrosterone (DHEA), testosterone, and 5α-dihydrotestosterone (DHT)] levels between sprint athletes (n = 15) and non-athletes (n = 15).
>Second, **in an 8-week intervention study, sprint athletes were randomly divided into 2 groups: resistance training with placebo (**n = 8) or with Dioscorea esculenta **(2,000 mg/day) intake (**n = 7). The serum DHEA, free testosterone, and DHT levels were lower in athletes than in non-athletes. Dioscorea esculenta intake combined with resistance training increased the arm fat-free mass, the 1 repetition maximum of deadlift and snatch, and the serum DHEA, free testosterone, and DHT levels, compared with resistance training and placebo intake. The results suggested that Dioscorea esculenta intake combined with resistance training has further effects on muscle hypertrophy and strength in athletes by restoring secretion of androgen hormones.
Small study, with some mixed outcomes. Used trained athletes...
>5 male sprint athletes (mean age: 20±1 years, athletic history: 7.1±2.9 years) who were members of a collegiate track and field team (regular track training:5 days/week, 2–3h/day; resistance training: 2 times/week) ... Among the 15 sprint athletes, 8 of 400m runners, 6 of 400m hurdlers and 1 of 200m runners were participated
... if a bit towards the long end of sprinting.
I think Dioscorea esculenta is the Wild Yam (shan yao/山药) used in TCM; if so '20:1' extracts are widely available, and assuming these include the right compounds, the 2,000mg/day dose used in this study would be very inexpensive.
Diosgenin, found in "many species of Dioscorea", is definitely bioactive, but AFIAK hasn't been investigated as an ergogenic/anab... keep reading on reddit ➡
I call it cody :) But I'm wondering, does anyone know if I should cut the stems? I read somewhere that once the leaves begin to die off, it's a sign that its going dormant. Once this happens, the stem should be cut about 1-2in off the caudex. Has anyone done this/have experience? Thank you!
This plant is so fun, totally dormant for 8 months and then...BAM crazy fast growth!
I've never had such an attractive plant that visually grows everyday, the best!
I recently adopted a kitten who loves to nibble on my plants. I know, it's a pain in the ass 😶
I have managed to move most of my toxic plants out of reach from him, but I have one specific plant where I'm unsure if it's safe for cats or not. It's my Dioscorea elephantipes. I've been Googling without success.
Do you guys know if it's considered toxic to cats or if I can just leave it be?