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12 votes
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Daily commuter - stamina got worse after saddle height adjustment

A change of saddle height won't change your stamina. 'Stamina' is a crude term that reflects many processes within the body which contribute to powering the bike forward. At a very basic level, we ...
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11 votes
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Does a build-up of CO2 in the lungs make you out of breath?

This is a huge topic. It is true that the breathing reflex is controlled by CO2 in your body (not just in the lungs). The key is the acidity of the cerebrospinal fluid. If you reduce your CO2 level, ...
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10 votes
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How does biking speed correlate with the required effort?

The simplest physical model gives that the energy is proportional to the square of the speed but in that model maintaining a constant speed requires zero energy. This is a slight misstatement. If you ...
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9 votes

What are (a) the source of and (b) the justification (e.g. experimental) for the concept of "normalized power" used in physical endurance training?

My understanding is that high-intensity efforts are disproportionately taxing, and NP is a way of reflecting that. That is, if you went for one ride where you maintained a steady 75% FTP output, and ...
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7 votes

What are (a) the source of and (b) the justification (e.g. experimental) for the concept of "normalized power" used in physical endurance training?

Focusing more on the empirical part of the question, consider the link that R. Chung gave in his first comment to Adam Rice's answer. That's the introductory chapter to Andrew Coggan's book, training ...
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6 votes
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Is there a noticeable difference in the calorie-burning benefits of road vs. off-road cycling?

All that a smartphone app or cycle computer may hope to achieve, is to provide an estimate of the burnt calories. They do this by taking your speed, and possibly climb rate, and some assumptions about ...
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5 votes
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Recovery time after daily cycling - before anaerobic sports

Cycling shouldn't tax your core muscles unless you're in an extreme position. 10–15 miles of riding is not a lot. If you've just started riding, stick with it and it will get easier. If you want to ...
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4 votes

Daily commuter - stamina got worse after saddle height adjustment

How’s the overall seating position? Increasing saddle height – without changing handlebar position – will lead to a more “aggressive” position which puts more weight on your arms and allows less room ...
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4 votes
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What are (a) the source of and (b) the justification (e.g. experimental) for the concept of "normalized power" used in physical endurance training?

I was very curious about where the 4th power came from. I thought it might be from some fundamental physics and/or physiology, but it doesn't. It's just the result of a curve fitting/regression ...
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4 votes

Is there a noticeable difference in the calorie-burning benefits of road vs. off-road cycling?

Off-road a few maximum power bursts up a steep incline will feel exhausting, but don’t burn a lot of calories because the duration is so short. Usually you also have a lot of descents, technical ...
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3 votes

How does biking speed correlate with the required effort?

I have also noticed that sometimes it feels harder to ride slow (or run or walk slow) than to ride faster. The cause I have attributed to the impression is that I have a pace that's comfortable. ...
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2 votes

How does biking speed correlate with the required effort?

When riding in the plain the only thing limiting your velocity at a certain level of steady exertion is friction: Rolling and gear friction as well as drag. Interestingly, the force to overcome ...
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2 votes

How does biking speed correlate with the required effort?

The power (so likely the effort) is proportional to speed multiplied by force: E = F*v. This is why riding uphill faster is more difficult than riding slower (the force does not need to be larger, the ...
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