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Search: Posts Made By: RChung
Showing results 1 to 50 of 1000
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Forum: Training & Nutrition
04-15-24, 12:53 PM
Replies: 9
Views: 203
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+)
04-12-24, 09:46 AM
Replies: 73
Views: 1,588
Posted By RChung

Hmmm. If you have reliable cadence and speed...

Hmmm. If you have reliable cadence and speed sensors, you could measure the extent to which this occurs at different cadences.

We know that speed (in km/h) = cadence*60*gear ratio*wheel...
Forum: Fifty Plus (50+)
04-11-24, 07:52 AM
Replies: 73
Views: 1,588
Posted By RChung

Um, your first statement is wrong: if you are...

Um, your first statement is wrong: if you are maintaining power at constant cadence, pedal force is independent of increasing slope.

And your second statement addresses a different issue: if you...
Forum: Fifty Plus (50+)
04-10-24, 01:45 PM
Replies: 73
Views: 1,588
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+)
04-10-24, 09:14 AM
Replies: 73
Views: 1,588
Posted By RChung

When you're lifting in the gym, does keeping your...

When you're lifting in the gym, does keeping your reps above 70 reps/minute prevent knee pain?
Forum: Fifty Plus (50+)
04-10-24, 09:11 AM
Replies: 73
Views: 1,588
Posted By RChung

Oh, I've looked at this, too, and I agree with...

Oh, I've looked at this, too, and I agree with it. But at the moment I'm fighting the "slow cadence hurts your knees" fight. Later on we can move on to the high pedal force fight.
Forum: Fifty Plus (50+)
04-10-24, 09:03 AM
Replies: 73
Views: 1,588
Posted By RChung

If you've run out of gears going up a steep...

If you've run out of gears going up a steep climb, then slow down. In that case, decreasing cadence will decrease, not increase, crank torque. (To be fair, crank torque in that case is almost...
Forum: Fifty Plus (50+)
04-10-24, 08:56 AM
Replies: 73
Views: 1,588
Posted By RChung

So what you're arguing is that torque is...

So what you're arguing is that torque is equivalent to torque??? OK, I agree with you on that.
Forum: Fifty Plus (50+)
04-10-24, 08:27 AM
Replies: 73
Views: 1,588
Posted By RChung

Stop right there. Power isn't equivalent to...

Stop right there. Power isn't equivalent to torque.
Forum: Fifty Plus (50+)
04-10-24, 07:20 AM
Replies: 73
Views: 1,588
Posted By RChung

Low cadence is a poor proxy for high force. I can...

Low cadence is a poor proxy for high force. I can pedal slowly with either low or high force. I can pedal quickly with either low or high force. Now that many of us have power meters, it's (way past)...
Forum: Fifty Plus (50+)
04-09-24, 10:28 PM
Replies: 73
Views: 1,588
Posted By RChung

Right now I'm sitting at my desk, my legs are...

Right now I'm sitting at my desk, my legs are moving at 0 rpm, and my knees aren't complaining. When you sit at a desk or table, do your knees complain?

I don't think the problem is low cadence.
Forum: Fifty Plus (50+)
04-08-24, 09:36 AM
Replies: 73
Views: 1,588
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: Living Car Free
04-01-24, 08:26 AM
Replies: 27
Views: 2,645
Posted By RChung

The AP article was built from anecdotes ("many...

The AP article was built from anecdotes ("many riders seem to think rules don't apply to them") while the Le Monde article was based on data ("use of cycling lanes doubled in a year").

Anecdotes...
Forum: General Cycling Discussion
03-31-24, 08:10 AM
Replies: 54
Views: 1,629
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: 1,638
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: 1,932
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: 2,956
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: 2,956
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: 2,956
Posted By RChung

Oatfiberboy.

Oatfiberboy.
Forum: Training & Nutrition
03-20-24, 01:13 PM
Replies: 98
Views: 2,956
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...
Forum: Training & Nutrition
03-20-24, 12:44 PM
Replies: 98
Views: 2,956
Posted By RChung

Damn. Well, I'm convinced.

Damn. Well, I'm convinced.
Forum: Training & Nutrition
03-20-24, 12:42 PM
Replies: 98
Views: 2,956
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...
Forum: Training & Nutrition
03-20-24, 12:07 PM
Replies: 98
Views: 2,956
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...
Forum: Living Car Free
03-18-24, 06:16 PM
Replies: 27
Views: 2,645
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...
Forum: Northern California
03-15-24, 09:37 PM
Replies: 19
Views: 763
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...
Forum: Fifty Plus (50+)
03-15-24, 09:34 AM
Replies: 14
Views: 543
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...
Forum: Fifty Plus (50+)
03-13-24, 04:05 PM
Replies: 16
Views: 673
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: 673
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: 673
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: Indoor & Stationary Cycling Forum
03-12-24, 09:35 AM
Replies: 67
Views: 1,638
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...
Forum: Indoor & Stationary Cycling Forum
03-12-24, 08:21 AM
Replies: 67
Views: 1,638
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.
Forum: Indoor & Stationary Cycling Forum
03-12-24, 07:08 AM
Replies: 67
Views: 1,638
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.
Forum: Fifty Plus (50+)
03-11-24, 11:42 AM
Replies: 17
Views: 784
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, 09:50 AM
Replies: 17
Views: 784
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...
Forum: Fifty Plus (50+)
03-11-24, 09:00 AM
Replies: 17
Views: 784
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
03-09-24, 10:18 AM
Replies: 142
Views: 3,694
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....
Forum: General Cycling Discussion
03-08-24, 06:07 PM
Replies: 142
Views: 3,694
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"...
Forum: General Cycling Discussion
03-06-24, 07:15 PM
Replies: 191
Views: 6,459
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: 6,459
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: General Cycling Discussion
03-06-24, 12:20 PM
Replies: 191
Views: 6,459
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;...
Forum: General Cycling Discussion
03-05-24, 07:48 AM
Replies: 191
Views: 6,459
Posted By RChung

It does.

It does.
Forum: Training & Nutrition
02-26-24, 03:24 PM
Replies: 25
Views: 920
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: 3,867
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: 3,867
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: Advocacy & Safety
02-22-24, 09:55 AM
Replies: 46
Views: 2,285
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.
Forum: General Cycling Discussion
02-17-24, 06:44 PM
Replies: 113
Views: 4,560
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: Training & Nutrition
02-13-24, 02:25 PM
Replies: 38
Views: 1,939
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.
Forum: Training & Nutrition
02-13-24, 11:34 AM
Replies: 38
Views: 1,939
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...
Forum: Training & Nutrition
02-13-24, 11:31 AM
Replies: 38
Views: 1,939
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...
Forum: Training & Nutrition
02-12-24, 10:51 AM
Replies: 38
Views: 1,939
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...
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