WalrusDragonOnABike [they/them]

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Joined 6 months ago
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Cake day: December 31st, 2023

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  • I’ve used two different brand chest strap monitors (actually, 3, but one was in college spin class many years ago and I don’t have any of the data for that, but I used to average zone-4 heart rates with peaks over 210 bps basically every class, so it gives some comparison). With my current one, it seems responsive to everything from sedentary activity to intense cardio. That said, my average heart rate during exercise is above 150 (my most recent 1hr session, my HR rarely dropped below 160bps after the warmup), so the linear relationship between calories and HR no longer holds. So I agree I should take it with a grain of salt, but at least this calculator says at my weight I should be burning over 900 calories if my HR is 150 for 1 hour of exercise. My RHR is like 50, so its not like my HR is just always high either. Still HR-> calories still isn’t an exact conversion. A power meter or an O2 exhalation lab would give better info.

    Anyways, I agree intense cardio workouts are a lot more than cycling, which was mentioned in my above comment (I only burn about 700 calories/hr commuting vs 750-1000 getting exercise).

    The numbers I get from my HR apps are also lower than online calculators for equivalent workouts: they estimate my commute should be 900-1200 calories for my weight and pace (I’m 200lbs/90kgs), not 700 calories. I get to ride on lots of trails, so if not many people are out walking, I don’t have as much slowing down/speeding up as someone commuting by roads, and its on a carbon road bike, so that might contribute.

    Also, given the length of the commute, I’m not going to go slower than normal recreational bike rides: I just try to avoid doing all-out sprints on the way to work and then the ride on the way home I regularly did all-out sprints during some segments. And even if I went at a more casual pace, the total calories actually wouldn’t change that much (maybe 10-15%?). It would of course spread the remaining calories over more time, so the burn rate would be lower.

    Burning 1000 extra calories a day is killer.

    Which is why I stopped acoustic biking to work and switched to ebike. I would be tired during my shift even after just biking one way. I don’t know if I ever biked to work two days in a row: I don’t think I could have done my job if I tried that.



  • Diet is a huge component of most people’s footprint. If you start biking 12 hours more a week (how much I would need to if I wanted to switch from my ebike to my acoustic for commuting*), you are going to eat a lot more. If a significant amount of those calories is coming from the standard beef you’d get at a US supermarket, its no surprise you’d be better off using a coal-charged ebike at similar speeds**. So much fossil fuels go into producing that. Tomatoes are worse than chicken apparently though.

    *I’m not in good enough to bike at work in under 1.25 hours multiple days in a row and still be in good enough condition to do my job, especially if there are headwinds.



  • Depends what your spending is like. Someone who earns like 30K/year should get about 65% of their earning if they retire at 65. You’d have to save like another $1500/year (including company matches) to make up the difference.

    If I kept working til I was like 70 and my pay only keeps up with inflation, I’d get about 130% of my spending via social security.






  • To be meaningful, they should reflect the real-world imo. Which I they attempt to do? 18km/hr seems really slow for non-ebike (my last commute home by acoustic bike before I got an ebike was 27.0 km/hr), but I guess casual riders might go that speed?. If you use a class 3 ebike in the US, the ebike speed is also really slow (for class 1/2, its about right - I typically get 26km/hr). In Europe, speeds are typically less than the US for ebikes. And I think European urban speed limits tend to be less than US? Of course there’s also traffic, so there are times when cars average less speed than bikes. Depending on location and time of year, how intensely the AC/heater in the car is running may significantly impact traffic fuel efficiency. They could have just included a few different speeds for each option, I suppose.

    If you want to apply it to CO2, you need to convert that energy into CO2, but that’s also really dependent on energy source. Coal power will be a lot worse than solar and wind. Typical US beef will be a lot worse than chicken or wheat or solar/wind energy. So, you would need a second chart and then do the calculations. For the average person whose ebike speed and acoustic bike speed are nearly the same, the ebike is better in terms of CO2. If someone gets specifically cleaner energy sources, then it would be a lot better. OTOH, someone connect to a grid that’s mostly fossil fuels, but eats a low-CO2-emitting diet, the acoustic bike might be slightly better.