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Search: Posts Made By: RChung
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Forum: Road Cycling
03-25-24, 12:32 PM
Replies: 68
Views: 1,609
Posted By RChung

Yep. Not always, though it depends on...

Yep.


Not always, though it depends on what you consider "many." If you do it right and you're lucky, maybe three runs of a couple of minutes each, for each tire combo. But it's easier to do...
03-24-24, 03:01 PM
Replies: 96
Views: 2,201
Posted By RChung

Your concerns (about BMI, CVD, smoking, and race)...

Your concerns (about BMI, CVD, smoking, and race) were their concerns, which is why the risk model adjusted for "age, sex, race, total energy intake, education, income, food security status, smoking,...
03-23-24, 11:10 AM
Replies: 96
Views: 2,201
Posted By RChung

Yikes. NHANES (and its predecessors) has...

Yikes.

NHANES (and its predecessors) has been around for decades. It's the basic national survey that tracks nutrition and health, much like the Census tracks population growth and distribution,...
03-21-24, 09:37 AM
Replies: 96
Views: 2,201
Posted By RChung

Oatfiberboy.

Oatfiberboy.
03-20-24, 01:13 PM
Replies: 96
Views: 2,201
Posted By RChung

Close. Ordered rank to occurrence (in this case,...

Close. Ordered rank to occurrence (in this case, to death). Proportional hazards is, um, proportional, and Cox realized that proportionality is a strong enough restriction that you can get the risk...
03-20-24, 12:44 PM
Replies: 96
Views: 2,201
Posted By RChung

Damn. Well, I'm convinced.

Damn. Well, I'm convinced.
03-20-24, 12:42 PM
Replies: 96
Views: 2,201
Posted By RChung

Yeah, they didn't provide them -- you can calc...

Yeah, they didn't provide them -- you can calc the raw ratios but not the rates -- but these are proportional hazard models and the amazing feature of them is that you don't need to know the...
03-20-24, 12:07 PM
Replies: 96
Views: 2,201
Posted By RChung

Yep. At least in my field, posters are often not...

Yep. At least in my field, posters are often not so much for answering a question as for raising one; in those cases, a good goal is to get others to work on the same question and to see if they can...
03-18-24, 06:16 PM
Replies: 21
Views: 2,121
Posted By RChung

I missed this article in Le Monde from last...

I missed this article in Le Monde from last November: "In Paris, use of cycling lanes doubled in a year." That was from November 2022 to November 2023, so growth in cycling continued after the growth...
03-15-24, 09:37 PM
Replies: 19
Views: 713
Posted By RChung

From the SF Chronicle...

From the SF Chronicle (https://www.sfchronicle.com/bayarea/article/richmond-san-rafael-bridge-bike-land-weekend-only-19078284.php)
"But the new bike path has not exacerbated congestion that beset...
03-15-24, 09:34 AM
Replies: 13
Views: 377
Posted By RChung

Will you be doing this self-supported, with...

Will you be doing this self-supported, with touring gear? I've never done something like the Trans Pyrenees in one continuous go. Mostly, I've gone someplace and then ridden from there on various...
03-13-24, 04:05 PM
Replies: 16
Views: 523
Posted By RChung

They wrote in their paper that they tried BMI in...

They wrote in their paper that they tried BMI in place of waist size, and it had "negligible" change in the fit of the equation. This is pretty common for these types of "predictive" studies: they're...
03-13-24, 12:47 PM
Replies: 16
Views: 523
Posted By RChung

Nonlinear fitting isn't complicated but it can be...

Nonlinear fitting isn't complicated but it can be tedious, and there's a bias-variance trade-off. In effect, what that means is that you typically look for simple interaction or polynomial terms and...
03-13-24, 10:33 AM
Replies: 16
Views: 523
Posted By RChung

Woah. So I guess exercising doesn't have much...

Woah. So I guess exercising doesn't have much effect on VO2Max.

The R^2 = 0.61 for men and 0.54 for women, so not super great -- however, for a population-level non-exercise test based only on...
03-12-24, 09:35 AM
Replies: 67
Views: 1,342
Posted By RChung

Zwift already does this by allowing users to...

Zwift already does this by allowing users to change the slope effect. And, since rolling resistance scales like slope, including rolling resistance already messes with the "actual" course slope...
03-12-24, 08:21 AM
Replies: 67
Views: 1,342
Posted By RChung

Slope and rolling resistance scale exaclly alike....

Slope and rolling resistance scale exaclly alike. Aero doesn't scale like slope and RR, but you can translate aero drag into a slope (or rolling resistance) equivalent.
03-12-24, 07:08 AM
Replies: 67
Views: 1,342
Posted By RChung

If only there were some way to convert...

If only there were some way to convert aerodynamic drag into an equivalent slope drag.
03-11-24, 11:42 AM
Replies: 16
Views: 599
Posted By RChung

Some Asian countries count age differently than...

Some Asian countries count age differently than most Western countries. Korea used to follow Asian customs but recently switched to follow Western customs. That's the kind of detail that makes people...
03-11-24, 09:50 AM
Replies: 16
Views: 599
Posted By RChung

Ah, that makes more sense, and I think we'd agree...

Ah, that makes more sense, and I think we'd agree that this is the current "operative hypothesis": conditional on attaining some advanced age (I'm not sure that 85 is exactly the number), then...
03-11-24, 09:00 AM
Replies: 16
Views: 599
Posted By RChung

Hmmm. I'm not quite sure about that though I'm...

Hmmm. I'm not quite sure about that though I'm not the expert in this area: my wife is, though, and she doesn't think about mortality or longevity in quite such a cut-and-dried way. I think people...
03-09-24, 10:18 AM
Replies: 142
Views: 3,337
Posted By RChung

If you have the data (and they did) you can...

If you have the data (and they did) you can usually tell when a rider switches from sitting to standing. Sometimes you can also tell when they switch from standing to sitting but it's less obvious....
03-08-24, 06:07 PM
Replies: 142
Views: 3,337
Posted By RChung

Most riders vary their power, cadence, and crank...

Most riders vary their power, cadence, and crank torque depending on the length of the climb and steepness, so most of us are both spinners and grinders, depending on the gradient and how "motivated"...
03-06-24, 07:15 PM
Replies: 191
Views: 5,994
Posted By RChung

If only there were some way to assess Crr (and...

If only there were some way to assess Crr (and CdA) with field tests on real roads.

(That said, measuring Crr is one of those things where you need to be careful with the measurements).
03-06-24, 01:33 PM
Replies: 191
Views: 5,994
Posted By RChung

That works if your errors are random. That...

That works if your errors are random. That doesn't work if the errors are systematic.


If it were that hard, I wouldn't've been able to do it. But, in general, the smaller the difference you're...
03-06-24, 12:20 PM
Replies: 191
Views: 5,994
Posted By RChung

Yep, I feel your pain. This is a variant of, "If...

Yep, I feel your pain. This is a variant of, "If I can see it or measure it easily, it must be important; if I can't, it's safe to assume it's negligible." That's often a practical response;...
03-05-24, 07:48 AM
Replies: 191
Views: 5,994
Posted By RChung

It does.

It does.
02-26-24, 03:24 PM
Replies: 25
Views: 842
Posted By RChung

The 220-age formula was proposed by Fox and...

The 220-age formula was proposed by Fox and Haskell, and there's an interesting (and funny) story from the NYTimes from 2001 that goes into its history....
Forum: Road Cycling
02-22-24, 10:40 PM
Replies: 113
Views: 3,658
Posted By RChung

Yeah, our youngest is a HS senior and waiting to...

Yeah, our youngest is a HS senior and waiting to find out where she'll be next fall. I'd just like to emphasize that those high tuition fees ain't going to us.
Forum: Road Cycling
02-22-24, 07:34 PM
Replies: 113
Views: 3,658
Posted By RChung

Getting back to cycling, I'm an academic so I'm...

Getting back to cycling, I'm an academic so I'm not poor but I'm poorish -- so I've had to figure out ways to become a faster rider not by buying stuff but by figuring stuff out. That said, when I...
02-22-24, 09:55 AM
Replies: 46
Views: 2,060
Posted By RChung

I wondered about the timing. I was on Oregon...

I wondered about the timing. I was on Oregon Expwy just before 9 pm in a light rain.

RIP.

I hope they find the two drivers who hit her and didn't stop.
02-17-24, 06:44 PM
Replies: 113
Views: 4,224
Posted By RChung

You know all those post-apocalyptic books and...

You know all those post-apocalyptic books and movies where people are walking through deserts? Why aren't there post-apocalyptic books and movies where people are riding bikes?
02-13-24, 02:25 PM
Replies: 38
Views: 1,701
Posted By RChung

Do you know me or what? Can you send me a...

Do you know me or what?

Can you send me a couple of .fit files? Maybe "typical" max efforts for the track and the trainer -- and, thinking about it, from the road where you're climbing that hill.
02-13-24, 11:34 AM
Replies: 38
Views: 1,701
Posted By RChung

There clearly are differences in how different...

There clearly are differences in how different trainers with different inertial loads benefit or disadvantage racers in Zwift. I'm actually also seeking out data files right now for riders who've...
02-13-24, 11:31 AM
Replies: 38
Views: 1,701
Posted By RChung

If you're doing max efforts on the track and on...

If you're doing max efforts on the track and on the trainer (but not on the road) then I'd like to see the data for the track and the trainer. We know how force and cadence combine to produce power...
02-12-24, 10:51 AM
Replies: 38
Views: 1,701
Posted By RChung

I think the most helpful would be if you looked...

I think the most helpful would be if you looked at, say, your best 30 seconds and the preceding 15 seconds (so, 45 seconds total) for both your best ooutdoor and your best indoor efforts. If you're...
02-11-24, 07:47 PM
Replies: 208
Views: 5,822
Posted By RChung

A conversation I had with my wife today

Me, a few hours ago, staring out the window at the weather, thinking out loud: "Today's the Super Bowl."
She: "What's the Super Bowl?"
Me:
Me: "Football. American football."
She: "Oh, is that the...
02-11-24, 06:52 PM
Replies: 38
Views: 1,701
Posted By RChung

What does your QA (that is, pedal force-pedal...

What does your QA (that is, pedal force-pedal speed or cadence/crank torque) plot look like on the trainer vs. on the road for "similar" types of ride profiles? And, not so visible on the QA plot...
02-11-24, 04:12 PM
Replies: 11
Views: 414
Posted By RChung

Yeah, I saw your post. And there's someone there...

Yeah, I saw your post. And there's someone there who does occasionally sound a lot like Andy.
02-11-24, 03:51 PM
Replies: 11
Views: 414
Posted By RChung

We all were. BTW, I do hang out sometimes on...

We all were.

BTW, I do hang out sometimes on r/velo (just not as rchung; sometimes it's more fun that way). Thanks.
02-11-24, 03:16 PM
Replies: 11
Views: 414
Posted By RChung

For those of you who aren't aware of it, Ric is...

For those of you who aren't aware of it, Ric is the originator of the MAP ramp test, about 25 (?? yikes!) years ago.
02-11-24, 01:19 PM
Replies: 113
Views: 4,224
Posted By RChung

Very nice. Those are close to my rule-of-thumb...

Very nice. Those are close to my rule-of-thumb that running pace in m/s is about equal to watts/kg. My "equivalent" ratios would be 26.8 and 16.7, i.e., about 4% different. I would say that 4%...
02-10-24, 12:09 PM
Replies: 43
Views: 2,108
Posted By RChung

Dude, it's not dismissive or insulting at all...

Dude, it's not dismissive or insulting at all (though you prioritize differently than others, so if you're insulted, it's OK for that to be your reality. I don't judge.) I can absolutely positively...
02-09-24, 10:42 PM
Replies: 43
Views: 2,108
Posted By RChung

Pretty jaded way to look at things. Maybe...

Pretty jaded way to look at things.

Maybe it's an interesting experiment in finding ways to turn a traditionally solo and closed off activity into a social and enjoyable activity.
Gamifying and...
02-09-24, 10:48 AM
Replies: 43
Views: 2,108
Posted By RChung

Zwift is an interesting experiment in finding the...

Zwift is an interesting experiment in finding the least amount of visual and physics realism that you can have and still retain users. The climb portals and descending physics reveal that the floor...
02-09-24, 09:48 AM
Replies: 55
Views: 2,621
Posted By RChung

Apophenia. [Edited to add:] Apophenia is the...

Apophenia.

[Edited to add:] Apophenia is the tendency to see connections between things that are unconnected, or patterns in things that are random. I tell the students that when they're hunting...
02-09-24, 12:43 AM
Replies: 55
Views: 2,621
Posted By RChung

Yup. There are a few papers that suggest that HRV...

Yup. There are a few papers that suggest that HRV could be used to identify thresholds (like, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7845545/) but I think they may be oversold.
02-08-24, 06:52 PM
Replies: 424
Views: 12,715
Posted By RChung

https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulletin/672x672/crr_vs_mass_steep_25fac4e8edbfb0e41b54d31aeda6e770104221ed.png

The difference in Crr between a Conti 4000 and Conti 5000 is equivalent...
02-08-24, 03:21 PM
Replies: 424
Views: 12,715
Posted By RChung

If you're a weight weenie, you should also be a...

If you're a weight weenie, you should also be a Crr-weenie. If you're weight-weenie but not a Crr-weenie, then it means your weight-weenism is all for show, so that's the point at which you should...
02-08-24, 10:13 AM
Replies: 102
Views: 6,540
Posted By RChung

For years I've taught only in the fall semester...

For years I've taught only in the fall semester and did all my other research the rest of the year. During the fall, my hours went way down and you can only do what you can do so I would prop up my...
02-07-24, 12:38 PM
Replies: 113
Views: 4,224
Posted By RChung

Someone once posed the question this way: "A...

Someone once posed the question this way: "A co-worker and myself are having a friendly bike / run contest. What is a good ratio for miles ridden vs. miles run? I know it depends on pace. But I'm...
Showing results 1 to 50 of 1000
 


 
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