Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Exercise intensity influences body composition in healthy older adults (2025)

maturitas.org

Post reply on HN
Print view View original

171–180 of 194 posts

Re: Exercise intensity influences body composition in healthy older adults (2025)

#171

Post by pandaman »

alfiedotwtf wrote: post #82
thesz wrote: post #76

Earlier quoted context omitted.

HIIT is a borderline strength training. Consider Tabata protocol. It is supermaximal effort protocol, participants are required to exert maximum effort repeatedly. The duration of active phase of Tabata is 20 seconds, half of approximately 40 seconds after which maximum performance (power output) drops significantly, because body switches to a different energy system. In my experience, Tabata squats are done in range…

So that’s for building muscle, but what about if you wanted to lose a few kilos and increase endurance for long distance running? What would be the way to go to optimise your time?

Zone 2 - you are burning fat and building up endurance while keeping recovery time at minimum.

Re: Exercise intensity influences body composition in healthy older adults (2025)

#172

Post by proee »

robocat wrote: post #166
proee wrote: post #93

So warning about super-high intensity workouts. For a good while I would sprint hard as possible up 8 flights of stairs everyday instead of taking the elevator. I would do this multiple times per day (3,4 sometimes 5) with no warm-up/cool-down . Each time I would try to push for a PR, figuring might as well go for it! One day, after about a year of doing this, I noticed my heart rate at the top felt a little off. I t…

> PR = Personal Record > AFIB = Atrial fibrillation = a type of irregular heart rhythm > HIIT = High-Intensity Interval Training

ER = Emergency Room :-)

Re: Exercise intensity influences body composition in healthy older adults (2025)

#173

Post by pandaman »

nkmnz wrote: post #167
meroes wrote: post #106

Earlier quoted context omitted.

Longer slower running burns more fat because your body isn’t forced to use as much glycogen as faster paced running. I guess the answer for optimizing time is to get a home treadmill if removing the commute to a trail/track will make the timing work.

This is incorrect. Each minute of fast running bruns more fat than a minute of slower running. Longer slower running burns more fat only because you can do it for a longer period time, increasing total energy expenditure over the whole workout. If you want to maximize fat loss, you still need to maximize energy expenditure. If the available time is fixed and low, HIIT is the way to go. If the available time isn't fix…

[dead]

Re: Exercise intensity influences body composition in healthy older adults (2025)

#174

Post by flextheruler »

maerF0x0 wrote: post #126
tryagainian wrote: post #117

Earlier quoted context omitted.

My BMI is 28.7 at 181cm and 94kg at 45.25 years old. Am I overweight, not far off obesity? You probably wouldn’t say so if you saw me. BMI is mostly only a useful metric when it is.

I'm with ya at 29.4. I carry a lot more muscle than the average populace, so I'm both high BMI and appear to be "fit" to casual onlookers. But dexa says 26% which is about double what I would like.

How do you conclude you carry more muscle than the average?

Re: Exercise intensity influences body composition in healthy older adults (2025)

#175

Post by j-conn »

all2 wrote: post #131
deeth_starr_v wrote: post #116

Earlier quoted context omitted.

Very interesting. I can also get Afib after many years of high intensity exercise

This happens to me occasionally, but it's typically stimulant and blood sugar related. There are some indications that it might be related to ion availability in your body, so copper, zinc, and calcium specifically. You may also consider that HF RF found in phones, wifi, and Bluetooth can do not great things to the calcium channels in cell walls (it essentially locks the channels open in some cases). There are a lot…

Citation for the phone, WiFi, Bluetooth claim? That’s an extraordinary claim and I’m very skeptical.

Re: Exercise intensity influences body composition in healthy older adults (2025)

#176

Post by bitexploder »

ralferoo wrote: post #122
bitexploder wrote: post #114

Earlier quoted context omitted.

"If you do aerobic exercise, almost all the energy comes from burning fat. " This is directionally incorrect. Your body will burn both concurrently. For low intensity aerobic exercise, fat is used as the dominant energy source. However even at moderate intensity levels like jogging and "zone 2" aerobic you are 50/50. At higher intensity you have crossed the inflection point and are using more glycogen than not. All s…

> This is directionally incorrect. Your body will burn both concurrently. For aerobic exercise, your body gets around 95% of the energy from burning fat. If you are doing exercise where you are 50/50, then it is by definition no longer aerobic exercise but anaerobic. Anaerobic exercise starts at the point that your body is forced to use glucose from glycogen to provide energy because you have reached the limit of the…

[dead]

Re: Exercise intensity influences body composition in healthy older adults (2025)

#177

Post by robotresearcher »

Etheryte wrote: post #169
robotresearcher wrote: post #144

Earlier quoted context omitted.

Going for one rep max is intense. If it weren't, you could get a better max.

That's not what exercise intensity means, clearly you're not even remotely familiar with the domain.

In the context of weight lifting, or neuromuscular demand, a one rep max is very high intensity exercise. In the context of metabolic demand, it is not.

Your tone is very aggressive. Not necessary.

Re: Exercise intensity influences body composition in healthy older adults (2025)

#178

Post by Fire-Dragon-DoL »

jr3592 wrote: post #164
tdiff wrote: post #148

Earlier quoted context omitted.

I would guess they mean hiit can traumatize e.g. joints or cardiovascular system, especially for the elderly.

Most people don't understand how important, even vital, proper rest is. Injuries are almost always the result of overuse and/or insufficient rest. HIIT itself is not dangerous, or even bad for you, if you spend the time to learn about it and how to incorporate into your life safely. If you're out of shape, and don't train regularly, go out and try HIIT you're going to have a bad time.

Could you provide some resources for learning?

Re: Exercise intensity influences body composition in healthy older adults (2025)

#179

Post by Fire-Dragon-DoL »

bitexploder wrote: post #63
criddell wrote: post #42

Earlier quoted context omitted.

Maybe with older adults the baseline goal should be to merely maintain or slow the loss of the muscle, mobility, and cardiovascular capacity they already have? It's not realistic for a 50 year old to think they could build muscle year-after-year for the next 30 years.

However, if you are a male and age 50 you can definitely expect to still build muscle up to 60 if you are diligent with your strength training. You can maintain mass 60-70. You do need a little more protein. I collected as much proven data and studies on this as I could: https://stealthgoat.com/building-muscle.html

This was gold, thank you for linking it. I need to find somebody to monitor my form but I am not that far from doing what this post suggests!

Over 60 you cannot build muscles anymore?

Re: Exercise intensity influences body composition in healthy older adults (2025)

#180

Post by thesz »

alfiedotwtf wrote: post #82
thesz wrote: post #76

Earlier quoted context omitted.

HIIT is a borderline strength training. Consider Tabata protocol. It is supermaximal effort protocol, participants are required to exert maximum effort repeatedly. The duration of active phase of Tabata is 20 seconds, half of approximately 40 seconds after which maximum performance (power output) drops significantly, because body switches to a different energy system. In my experience, Tabata squats are done in range…

So that’s for building muscle, but what about if you wanted to lose a few kilos and increase endurance for long distance running? What would be the way to go to optimise your time?

I do not know. I am here to point out that HIIT is almost a resistance training. ;)

Here's meta review of resistance training for endurance running: https://pmc.ncbi.nlm.nih.gov/articles/PMC11258194/

Here's old one: https://pubmed.ncbi.nlm.nih.gov/18460997/

I think it is possible to utilize squats both as weight losing device and running economy improvement device.

I do not run, though, as I am too old. But I love barbell squats!

Post reply on HN