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Search: Posts Made By: RChung
Showing results 1 to 50 of 490
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Forum: Training & Nutrition
04-25-24, 03:48 PM
Replies: 47
Views: 1,109
Posted By RChung

There are many areas where Hunter and Andy have...

There are many areas where Hunter and Andy have agreed to disagree. That book is sort of "you write that chapter, I'll write this one, and we'll bind them up together." One pretty clear example is...
Forum: Training & Nutrition
04-25-24, 02:39 PM
Replies: 47
Views: 1,109
Posted By RChung

Umm, pretty sure that's not entirely so. Andy...

Umm, pretty sure that's not entirely so. Andy Coggan has repeatedly said that if you have power and RPE (and you always have RPE) then at best, HR is redundant; at worst, it's misleading.
Forum: Training & Nutrition
04-25-24, 12:32 PM
Replies: 47
Views: 1,109
Posted By RChung

[/b] I sorta have a love/hate thing going on...

[/b]
I sorta have a love/hate thing going on with the Aerolab chart.
Forum: General Cycling Discussion
04-24-24, 08:56 AM
Replies: 12
Views: 646
Posted By RChung

https://cimg0.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg0.ibsrv.net/gimg/bikeforums.net-vbulletin/500x282/94610da5407f9d8f898314471408ff32_e7f34f6042109cebdfaa364e098f128ca63924a1.gif

If you've been following the reports, the handwriting...
Forum: Training & Nutrition
04-23-24, 03:52 PM
Replies: 47
Views: 1,109
Posted By RChung

I use power data to keep accurate and precise...

I use power data to keep accurate and precise track of my decline.
Forum: Fifty Plus (50+)
04-22-24, 09:19 AM
Replies: 105
Views: 6,458
Posted By RChung

We ride Zone 2 not to ride in Zone 2 but to...

We ride Zone 2 not to ride in Zone 2 but to prepare for not riding in Zone 2.
Forum: Training & Nutrition
04-19-24, 09:09 AM
Replies: 27
Views: 1,116
Posted By RChung

Yep. "The purpose of models is not to fit the...

Yep. "The purpose of models is not to fit the data but to sharpen the questions." TSS and the PMC don't fit the data all that well but they do sharpen our questions, and that has value.

I do use...
Forum: Training & Nutrition
04-15-24, 12:53 PM
Replies: 27
Views: 1,116
Posted By RChung

Just redefine your Zone 2 so it's really wide,...

Just redefine your Zone 2 so it's really wide, spend almost all your time in Zone 2, and avoid talking specifics with the Zone Nazis.
Forum: Fifty Plus (50+)
04-10-24, 01:45 PM
Replies: 79
Views: 2,429
Posted By RChung

Of course decreasing cadence will decrease power...

Of course decreasing cadence will decrease power in the same gear if the slope is a constant. But if you are maintaining power as the slope increases then pedal force will increase at a constant...
Forum: Fifty Plus (50+)
04-08-24, 09:36 AM
Replies: 79
Views: 2,429
Posted By RChung

You know, there's a connection between cadence,...

You know, there's a connection between cadence, pedal force, and power. When you increase your power, *both* cadence and pedal force tend to increase (though not equally): your cadence doesn't remain...
Forum: General Cycling Discussion
03-31-24, 08:10 AM
Replies: 54
Views: 1,785
Posted By RChung

For my own mechanical, 10 or 12 minutes. Anything...

For my own mechanical, 10 or 12 minutes. Anything more than that, I've either fixed or the ambulance came. I did walk 2 miles once but not really for me. I happened on a couple hobbling down the...
Forum: General Cycling Discussion
03-30-24, 09:12 AM
Replies: 43
Views: 1,764
Posted By RChung

My observation is that *most* road riders can,...

My observation is that *most* road riders can, through trial and error, eventually get themselves close to a good position -- but *most* TT and Tri bike riders won't.
Forum: Road Cycling
03-25-24, 12:32 PM
Replies: 68
Views: 2,130
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...
Forum: Training & Nutrition
03-24-24, 03:01 PM
Replies: 98
Views: 3,559
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,...
Forum: Training & Nutrition
03-23-24, 11:10 AM
Replies: 98
Views: 3,559
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,...
Forum: Training & Nutrition
03-21-24, 09:37 AM
Replies: 98
Views: 3,559
Posted By RChung

Oatfiberboy.

Oatfiberboy.
Forum: Fifty Plus (50+)
03-13-24, 04:05 PM
Replies: 16
Views: 778
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...
Forum: Fifty Plus (50+)
03-13-24, 12:47 PM
Replies: 16
Views: 778
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...
Forum: Fifty Plus (50+)
03-13-24, 10:33 AM
Replies: 16
Views: 778
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...
Forum: Fifty Plus (50+)
03-11-24, 11:42 AM
Replies: 17
Views: 893
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...
Forum: Fifty Plus (50+)
03-11-24, 09:00 AM
Replies: 17
Views: 893
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...
Forum: General Cycling Discussion
03-06-24, 07:15 PM
Replies: 191
Views: 6,719
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).
Forum: General Cycling Discussion
03-06-24, 01:33 PM
Replies: 191
Views: 6,719
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...
Forum: Training & Nutrition
02-26-24, 03:24 PM
Replies: 25
Views: 1,053
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: 4,077
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: 4,077
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...
Forum: General Cycling Discussion
02-17-24, 06:44 PM
Replies: 113
Views: 4,864
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?
Forum: General Cycling Discussion
02-11-24, 07:47 PM
Replies: 208
Views: 6,292
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...
Forum: Training & Nutrition
02-11-24, 06:52 PM
Replies: 38
Views: 2,107
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...
Forum: Training & Nutrition
02-11-24, 04:12 PM
Replies: 11
Views: 540
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.
Forum: Training & Nutrition
02-11-24, 03:16 PM
Replies: 11
Views: 540
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.
Forum: General Cycling Discussion
02-11-24, 01:19 PM
Replies: 113
Views: 4,864
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%...
Forum: General Cycling Discussion
02-10-24, 12:09 PM
Replies: 43
Views: 2,214
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...
Forum: General Cycling Discussion
02-09-24, 10:42 PM
Replies: 43
Views: 2,214
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...
Forum: General Cycling Discussion
02-09-24, 10:48 AM
Replies: 43
Views: 2,214
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...
Forum: Training & Nutrition
02-09-24, 09:48 AM
Replies: 55
Views: 3,002
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...
Forum: Training & Nutrition
02-09-24, 12:43 AM
Replies: 55
Views: 3,002
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.
Forum: General Cycling Discussion
02-08-24, 06:52 PM
Replies: 424
Views: 13,595
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...
Forum: General Cycling Discussion
02-08-24, 03:21 PM
Replies: 424
Views: 13,595
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...
Forum: Training & Nutrition
02-08-24, 10:13 AM
Replies: 112
Views: 7,812
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...
Forum: General Cycling Discussion
02-07-24, 12:38 PM
Replies: 113
Views: 4,864
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...
Forum: Training & Nutrition
02-04-24, 08:00 PM
Replies: 47
Views: 2,403
Posted By RChung

Andy also said that if you don't see a drop of...

Andy also said that if you don't see a drop of blood on your chamois after a TT, you didn't go hard enough. I think that may have been when I decided I wasn't cut out for TT'ing.
Forum: Fifty Plus (50+)
02-03-24, 10:53 AM
Replies: 73
Views: 3,388
Posted By RChung

Could've been worse. It could've said, "We are...

Could've been worse. It could've said, "We are not impressed."
Forum: Fifty Plus (50+)
01-31-24, 07:45 PM
Replies: 73
Views: 3,388
Posted By RChung

Five decades ago I was a coxswain on the Cal...

Five decades ago I was a coxswain on the Cal Crew. (Berkeley sent their eights to the Olympics in 1928 and 1932 (and 1948) and won gold). The average height and weight of the varsity crew in the...
Forum: Training & Nutrition
01-31-24, 07:23 PM
Replies: 51
Views: 2,148
Posted By RChung

Just in case you guys were worried, I'm not going...

Just in case you guys were worried, I'm not going to post a photo of myself featuring my short fat legs and paunch.
Forum: Fifty Plus (50+)
01-30-24, 04:02 PM
Replies: 73
Views: 3,388
Posted By RChung

To be fair, what would you do with the...

To be fair, what would you do with the information on VO2Max if you had it? Especially if the estimate of VO2Max were as rule-of-thumby as Friel's?

I've had a power meter for years, and I rarely...
Forum: Fifty Plus (50+)
01-30-24, 11:52 AM
Replies: 73
Views: 3,388
Posted By RChung

Well, *mostly* all you need to really know is...

Well, *mostly* all you need to really know is that cardiac stroke volume for the kinds of guys that would read Friel's "Fast after 50" book is ballpark about 70 mL of blood per beat, assuming average...
Forum: Training & Nutrition
01-29-24, 10:51 AM
Replies: 51
Views: 2,148
Posted By RChung

Maybe I'll stop off at Costco for that $5 roasted...

Maybe I'll stop off at Costco for that $5 roasted chicken and eat it all for my post ride snack. Should I pick up the hot dog, too?
Forum: Training & Nutrition
01-27-24, 03:21 PM
Replies: 90
Views: 3,879
Posted By RChung

Nope, but I won't say who I've been yelled at,...

Nope, but I won't say who I've been yelled at, other than to say that my work has shown that *when adjusted for patient status at time of delivery of service*, the quality of care at some big...
Forum: Training & Nutrition
01-27-24, 02:20 PM
Replies: 90
Views: 3,879
Posted By RChung

Thank goodness, no. (Although I studied Econ and...

Thank goodness, no. (Although I studied Econ and have a grad degree in it). I just retired ("just" as in, Dec. 31) from one of the few PhD-granting Demography departments in the world.


Yeah, I...
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