Live data from Hacker News

How Strenuous Exercise Affects Our Immune System

nytimes.com

181–190 of 190 posts

Re: How Strenuous Exercise Affects Our Immune System

#181

Earlier quoted context omitted.

I cited my scientific qualifications to demonstrate that I am uniquely positioned to assess the quality and scope of the scientific research we are discussing and - crucially - the interpretations thereof. Most on HN lack the background knowledge and training to usefully interpret a review article like this, let alone a journalistic simplification. Yes, I cite "thoughts from my own mind", a mind which has spent years…

> ...I am uniquely positioned to assess the quality and scope of the scientific research we are discussing... > Most on HN lack the background knowledge and training to usefully interpret a review article like this, let alone a journalistic simplification. It seems like you can't help but belittle the audience you're replying to. It comes across as if you're saying "I'm the elite academic talking down to all of you p…

You're right, I was honestly just testing out an elitist writing style to see what the responses would be like. It's a challenge to argue on semi-anonymous forums, and it's interesting seeing how tone plays out. It's been a good discussion for sure.

Re: How Strenuous Exercise Affects Our Immune System

#182

Earlier quoted context omitted.

Not sure what I can do with this information. I live in a crowded city and this is the only place I can get a workout.

It’s the thinking person’s altitude training!

Off-gassing toxins for long lasting training benefits free of charge! Feel the burn!

Re: How Strenuous Exercise Affects Our Immune System

#183
post #40

As a machinist and building maintenance engineer, I can almost guarantee any ill feeling you're experiencing after a trip to your local gym is due to the air quality. Gyms are rarely purpose built facilities. Rather, theyre rented and renovated spaces. In turn, airflow in the structure is planned for light industrial or office space. Almost no thought goes into the fact that gyms are sometimes hundreds of occupants m…

Not sure what I can do with this information. I live in a crowded city and this is the only place I can get a workout.

Go during off hours when there are less people disturbing all the plastics and breathing the precious oxygen.

Just more pleasant in general as well.

Re: How Strenuous Exercise Affects Our Immune System

#184

Earlier quoted context omitted.

You’re not even mentioning CO2 concentration. I work in a large, open office with seemingly sufficient airflow, but after buying a CO2 detector on a whim I’ve seen that it frequently reaches 1200ppm, and you actually can tell that you feel like crap when that happens. I can’t imagine if the whole office was filled with people exercising.

Sorry for being off topic but I want to get one of these. Which one should I get?

It turns out measuring CO2 is expensive, but measuring VOC (volatile organic compounds, ethanol) exhaled by humans is cheap and one can map from the VOC PPM to equivalent CO2, in the datasheet referred to as CO2-equiv.

https://www.mouser.com/datasheet/2/682/Sensirion_Gas_Sensors...

Re: How Strenuous Exercise Affects Our Immune System

#185
post #87

Earlier quoted context omitted.

3500 kcal per day is nothing. One can have a basal resting metabolic rate of 2500 kcal, then do some sports and you get 3500 easily. And you seem to be a bit underweight, go build some more muscle. 75kg is featherweight for that height ;)

> And you seem to be a bit underweight Incorrect. My BMI is 21.4, which is almost exactly in the middle of the "healthy" range for my height. (Healthy BMI range is defined 18.5 - 25)

I think that the issue here is that we're comparing aerobic and strength sports - weightlifters usually seem to aim for BMIs around the "overweight" 25-30 range.

Re: How Strenuous Exercise Affects Our Immune System

#186
post #92

Earlier quoted context omitted.

i have a pet fascination with air quality- not in any real sense, but im always just wondering about it, since its so varied and virtually invisible. are there any simple small tools you know of that are good at get information about air quality. the only thing i see people sometimes use is a particulate meter that tells them the concentration of particulate matter of various sizes. seems like it would be cool to hav…

You can get CO2 meters quite easily on amazon. They sell them as a commodity for greenhouses measurement. For particulates, the Laseregg is the best I've found. Apparently the laseregg 2+ measures VOC, but I'm not sure about that. From what I heard there are no VOC meters available at a consumer level. CO2 is the best proxy, because high CO2 means low ventilation, which prevents venting of VOCs.

I think you have it backwards from the cursory research I did by scanning over the datasheets for various sensors. VOC are easier to measure than CO2 and for rooms occupied by people their is a strong correlation between VOC and CO2. VOC sensors qty 1 are 5-12 where CO2 is 40-120. These are sensors themselves, not full devices.

Re: How Strenuous Exercise Affects Our Immune System

#187
post #93

Earlier quoted context omitted.

You need to put more effort in 1 hour cycling session to burn the same amount of calories as in 1 hour running session. Running activates more muscles.

But cycling affects largest human muscles, which work more intensively..

I was "professional" athlete many moons ago. When we measured max heart rate, we did it on a bike first and then on a treadmill running and then bike again. My max heart rate running was +5 beats allways and I was not a single case. I just couldn't get to my max heart rate while cycling.

Re: How Strenuous Exercise Affects Our Immune System

#188
post #141

Earlier quoted context omitted.

For an average male, that should be obtainable in about 6 months to a year.

You're ridiculous. You can say 315 is achievable in a year. 450 lbs doesn't even get on the charts for any weight up to 310 until intermediate level according to this chart [0]. Nobody with any sense considers themselves to be an 'intermediate' lifter after one year. [0] https://strengthlevel.com/strength-standards/deadlift

These are self-reported numbers mostly from novices on the Internet. I can assure you these do not represent consistent and specific training for this lift.

A 315lb deadlift is obtainable within a month.

Re: How Strenuous Exercise Affects Our Immune System

#189

Earlier quoted context omitted.

Are fed hunters statistically more likely to successfully hunt than unfed hunters? It seems plausible, so hunters that took advantage of their fed state would have had an adaptive advantage.

As far as we know, humans' originally competitive advantage in hunting was long-distance running. Game could out- sprint humans but not out- distance human hunters. So, after successfully running down game, they must have had enough in the tank to complete the kill. This practice is still evident in some African tribes.

I've heard of persistence hunting, but I've never seen it suggested that was our primary competitive hunting advantage. Do you have a citation of some sort?

Re: How Strenuous Exercise Affects Our Immune System

#190
post #171

Earlier quoted context omitted.

I've been doing cold showers after working out ... but when I do, I'm freezing _the entire day_. Does this happen to anyone else?

Does attire affect your temperature perception? I mean, maybe you're just not wearing enough...

Nothing different than I usually wear ... t-shirt and jeans, and I keep my house at 74 degrees (it's usually a bit warmer in my office). Under normal circumstances, as you can imagine, I find it quite comfortable.
Post reply on HN