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Some Work, All Play

294. The Bicarb Revolution, Theory of Doubles, Vitamin D Supplementation, Stairmill Training, and Zone 2 Weirdness!

Some Work, All Play

David Roche and Megan Roche

Running, Sports

4.82.1K Ratings

🗓️ 20 January 2026

⏱️ 85 minutes

🧾️ Download transcript

Summary

We loaded up on Vitamin D (and deodorant) before this fresh episode! The main topic was a new sodium bicarbonate study, tracking 40k bike time trial performance at altitude. It’s another brick in a really big scientific wall supporting the use of bicarb for performance. We zoom out to let you know why we think it’s also effective even in very long distances... and maybe at lower (cheaper) doses.

We also talked about Vitamin D supplementation, using a big review study showing that over half of athletes had inadequate levels. Hit the ADEQUATE sign!

And this one was full of great topics! Other topics: the power of taking 3 days off, an update on David’s health journey, arm band heart rate, our Nomio epiphany, shoe nerd news, a new analysis on running economy changes in different trail shoes, the Hopecore Corner with pieces of art we really like, a quick-hitter CBD study, improving bike power, the theory of doubles, a fun sports bra question, using the stairmill, heart rate zones, and whether to follow logic or the heart with race decisions.

We love you all! HUZZAH!

-David and Megan

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Transcript

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0:00.0

Woohoo.

0:01.0

Welcome to the SomeWork All Play podcast.

0:03.0

We are so happy to with you today.

0:04.0

Happy Tuesday.

0:05.0

It's Tuesday. And it's getting smelly up in here on this Tuesday. Yeah, yeah. I know we've addressed smell a lot recently and I know what you're talking about here because Megan, this little break from running all of a sudden I am just rocking it with the smells. Yesterday, I was doing the heat suit bike, which is my preferred method of activity right now,

0:23.4

because it means I put out less power.

0:24.8

I can do low torque cycling as my foot heels. And every time I lean down to get my water bottle, I was repulsed. It was truly terrible. Well, the heat suit is a convenient excuse because you are making puddles on the ground. You are sweat and you are working hard. but it's in everyday life. And it's compounding. I feel like it's that testosterone, that sweet, sweet testosterone that's coming out to play. Yeah, I'm pretty hyped, you know? I feel like everything is starting to look golden for me because it's all coming from, you know, taking this a little bit of time off. It's forced. But I think it's been good. And, you know, biking and the hope is back. The optimism is back. And it's mainly expressing itself through my pits. I feel like we should put the pits on the stages of injury grief. And it's somewhere near the end because it's like your body is healed enough to actually smell terrible all the time. So true.

1:21.2

But to be serious, like an actual recommendation that we wanted to start with today is one of the big changes I've made this winter is major vitamin D supplementation for the first time.

1:27.2

Because I always had this issue that when I took certain types of vitamin D in the past, I would get PVCs.

2:01.0

I would get those little feelings in my heart of premature ventricular contractions. And as a result, I thought vitamin D wasn't for me. Turns out that it was probably just the source I was getting, like the liquid sources that I was using in the past. Because this year, I just stepped up to a different vitamin D source. And I think that might also be pushing it because there's studies that connect vitamin D levels to just about everything, right? Like in the literature, you can do hormones, but also anything else. I feel like the literature is a wild west of vitamin D studies. Yeah. We've actually looked at it at a bunch within studies that I've done. And over time, it's like, you find these weird associations. I'm like, I think we're seeing other things. Actually, we did an exploratory analysis and realized that athletes that were more

2:05.8

prone to stress fractures actually had higher levels of vitamin D. And it was likely because I went

2:11.5

back through and realized that those athletes also probably had a prior stress fracture. And we're like,

2:16.0

okay, we're going to take 5,000 I use of vitamin D. We are on the grief train. And so I feel like it's interesting to see some those associations. It's fascinating that you could get a confounder going the other direction. Because the usual way I think about it is that athletes or people that might focus on their vitamin D are more optimized in certain ways. So you might be catching health drivers that go in that direction.

2:34.7

But it's been really game-changing for me.

2:37.2

And I'm not sure whether it's the rest from running because I am pushing myself on the bike.

2:41.7

I mean, the heat suit is pushing me more than I am pushing myself.

2:45.1

But my energy levels have been much better than they've been in the winter.

2:48.4

Like I was joking last year that I was going to do a psychedelic trip, my first one ever,

2:54.5

going into winter because winter's a little hard on me in general.

2:58.1

And I felt really good emotionally.

3:00.9

And I tie it back to the MD.

3:02.2

And yeah, I know it's, you know, many factors going on here.

...

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