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Re:What Happens to Your Body on a Thru-Hike by justinator on Wednesday February 22, 2017 @07:15PM (#13710514)
I've done quite a few very strenuous, multi-week races on bike, including riding the Colorado Trail in 7 days [0], and riding to, then summiting all the Colorado 14ers in 34 [1] - as well as participating in the Tour Divide [2] twice.

I would call my fitness before these races as "peak", but I wouldn't call myself anything but near, "onset of over training syndrome" afterwards. The only thing I experienced similar to the author's was a slight bit of fat loss. Every other part of my body was wrecked, which took months to recover from.

One thing that stuck out with me is that they only hiked for 8 hours/day. That seems like a light day! compared to these races, where 5 hours of sleep is spoiling oneself. I guess the moral of the story before doing a, "thru hike for fitness" is to not to overdo it. It also seems like the author was in pretty alright shape to start out, with a fairly low pulse and overall bodyweight.

[0] http://www.climbingdreams.net/ctr/ [1] http://longranger.justinsimoni.com/tour14er/ [2] http://tourdivide.org/

Re:What Happens to Your Body on a Thru-Hike by nicolashahn on Wednesday February 22, 2017 @07:19PM (#13710531)
I'm willing to bet money that the single determining factor that led you to different results was the amount of sleep. 5 hours is not even enough for a sedentary person, much less someone riding a bike all day. The more you work out the more sleep you need. I'm guessing the author got at least 8 hours a night, or however much was enough to fully recover.
Re:What Happens to Your Body on a Thru-Hike by brendan_a_b on Wednesday February 22, 2017 @07:58PM (#13710738)
I'm reading a book on breaking the two hour marathon and one pro (I cant remember her name at the moment) sleeps 16 hours a day when her training peaks
Re:What Happens to Your Body on a Thru-Hike by jrowley on Wednesday February 22, 2017 @09:23PM (#13711132)
What's the book? Sounds interesting!
Re:What Happens to Your Body on a Thru-Hike by rodhan on Thursday February 23, 2017 @12:14AM (#13711815)
I'm guessing it's "Two Hours: The Quest to Run the Impossible Marathon", by Ed Caesar (http://www.irishtimes.com/culture/books/review-two-hours-the...)
Re:What Happens to Your Body on a Thru-Hike by dorfsmay on Thursday February 23, 2017 @11:14AM (#13715042)
This is really interesting, statistically people sleeping 7 hours have the highest life expectancy.

I personally need 8 to 9, but I'm sharper if I only sleep ~ 6 hours (and eventually crash and have to recuperate).

Re:What Happens to Your Body on a Thru-Hike by gjjrfcbugxbhf on Thursday February 23, 2017 @09:00AM (#13713871)
Paula Radcliffe
Re:What Happens to Your Body on a Thru-Hike by morgante on Wednesday February 22, 2017 @11:40PM (#13711693)
Indeed. One of my favorite things about thru-hiking is that you get a ton of sleep: it's not unusual go to bed shortly after sunset and wake up at sunrise.
Re:What Happens to Your Body on a Thru-Hike by Bartweiss on Thursday February 23, 2017 @11:17AM (#13715074)
I usually feel like crap hiking if I'm not in bed for 10+ hours. Mostly that's not hard - you're tired, and just sleep all night. It was a pain in the ass in Alaska, though; I think I'd have real trouble with long hikes there in the summer.
Re:What Happens to Your Body on a Thru-Hike by morgante on Thursday February 23, 2017 @12:16PM (#13715612)
I actually found kayaking and hiking in Alaska amazing (I was only there for 2 weeks). We'd be going for 12-16 hours a day but the constant sunlight made me feel super energized and happy.
Re:What Happens to Your Body on a Thru-Hike by chrismartin on Wednesday February 22, 2017 @08:23PM (#13710844)
The conditions of a race are very different from a thru-hike done for enjoyment. I got the best sleep of my life on the PCT. 8-9 solid hours each night (sometimes I would wake up to eat), and an hour nap after lunch every day.
Re:What Happens to Your Body on a Thru-Hike by reneherse on Thursday February 23, 2017 @01:13AM (#13712007)
That sounds like backpacking paradise, of which I am delighted to hear of as a contradiction to my experience. I hiked the New England section of the AT in high school, but our small party included a guy who snored louder than anyone I've ever met before or since. A wet, sucking, horrific noise that to the mind of my light-sleeping sixteen y/o self was surely identical to the sound of a giant lamprey or hagfish, slurping the innards of its living, long suffering prey, still undead after twenty-odd very very long nights...
Re:What Happens to Your Body on a Thru-Hike by 24gttghh on Thursday February 23, 2017 @08:52AM (#13713815)
Try some earplugs next time?
Re:What Happens to Your Body on a Thru-Hike by griffinmmahon on Wednesday February 22, 2017 @11:33PM (#13711655)
Your comment has me fondly remembering a backpacking trip in Wyoming. We'd go to sleep around 8 or 9 since it would get dark before then and wake up at about 7, and the sleep was indeed the best of my life, like coming out of a coma.
Re:What Happens to Your Body on a Thru-Hike by bootload on Wednesday February 22, 2017 @07:34PM (#13710623)
"One thing that stuck out with me is that they only hiked for 8 hours/day. That seems like a light day! compared to these races,"

Really. Carrying a 20kg pack for eight hours over rough terrain is less strenuous than bike riding? Do this for over 500 miles? Ever done this before? Hike on foot with 20kg packs on consecutive days? Make camp, make food, rest, break camp. Everything on your back. This is a lot more strenuous than you think. Hands down racing on a bike is much easier ^physically^ than hiking on foot carrying weight over broken terrain over long distances.

Re:What Happens to Your Body on a Thru-Hike by hsitz on Wednesday February 22, 2017 @11:48PM (#13711730)
""One thing that stuck out with me is that they only hiked for 8 hours/day. That seems like a light day! compared to these races,"

Actually, this is probably true. 8 hours a day, averaging 18 miles per day for 486 miles over 29 days is not that much. I don't see where they say they had 20kg packs, which is quite high weight for a thru-hiker. (EDIT: See now where he says he had 40 pound pack, which is probably at heaviest point with full load of food, still high for thru-hiking and maybe a reason they logged less miles/day.) 18 miles/day is probably right around average for thru-hikers, who are mostly out for enjoyment and sense of accomplishment, not for speed. You have to be in decent shape, but it's not a high-intensity endeavor.

There is a fairly sizeable subset of thru-hikers who do go for speed, though. Many average well over 40 miles per day for several months and over 2000 miles. (They're definitely not carrying 40 pound packs.) They accomplish this mostly by hiking for longer hours each day, not by moving faster, since going faster breaks their bodies down. E.g., see this article:

http://www.adventuresnw.com/heather-anish-anderson-speed-que...

Re:What Happens to Your Body on a Thru-Hike by nether on Thursday February 23, 2017 @02:05AM (#13712200)
18 miles can be quite an effort if there's over 7,000' of elevation gain. We're not told the grade of the trail but I imagine it's not flat.
Re:What Happens to Your Body on a Thru-Hike by hsitz on Thursday February 23, 2017 @02:31AM (#13712288)
The CT is about 500 miles long and has about 90,000 feet of accumulated elevation gain, which averages out to 3,200 feet over each 18 miles. That's not especially much for mountain hiking. One thing that makes the CT a bit harder is that it lies mostly at altitudes over 10,000 feet, where the air is thinner. Hiking 18 miles/day is quite an effort in any case, but still doing it on a hike like the CT is something the average person can do if they set their mind to it and train a bit for it.
Re:What Happens to Your Body on a Thru-Hike by bootload on Thursday February 23, 2017 @04:13AM (#13712613)
"One thing that makes the CT a bit harder is that it lies mostly at altitudes over 10,000 feet, where the air is thinner. Hiking 18 miles/day is quite an effort in any case, "

Altitude would stop a lot of people. How long to acclimatise living at sea level?

Re:What Happens to Your Body on a Thru-Hike by 24gttghh on Thursday February 23, 2017 @08:58AM (#13713855)
As long as you aren't in the 5% of people who get Acute Mountain Sickness, probably just chill for 1-3 days at 6K-8K ft, and then "Hike High-Sleep Low".
Re:What Happens to Your Body on a Thru-Hike by rconti on Thursday February 23, 2017 @12:27PM (#13715732)
I haven't spent much time at 10k but I routinely go to 8k and have never thought twice about it. Wake up, drive to 8k, do a trail race, go home.
Re:What Happens to Your Body on a Thru-Hike by bootload on Thursday February 23, 2017 @12:58AM (#13711946)
" 8 hours a day, averaging 18 miles per day for 486 miles over 29 days is not that much."

Have you done this?

Re:What Happens to Your Body on a Thru-Hike by hsitz on Thursday February 23, 2017 @01:28AM (#13712067)
No, although I've done many days of more than 18 miles in the mountains, including 50 mile single-day mountain races. (The elite runners complete those in around 6 to 7 hours, over terrain of similar difficulty to Colorado Trail.) I don't mean to downplay their achievement, but the article is about a pair of average thru-hikers, out for a relatively short thru-hike. It is something that the average person can do, if they set their mind to it.

It doesn't really make sense to compare that effort to a race of any kind, let alone a mountain bike race -- since the thru-hikers we're talking about were not doing it as a race. Of course their effort was done at a lower level of intensity. For some perspective, a fellow recently set the Colorado Trail record with a time of 9 days 12 hours, almost three times as fast as the thru-hikers in the article: http://johnzahorian.com/coloradotrailfkt

For anyone interested, here's a youtube video documenting the record effort. The guy is kind of a celebrity in hiking circles, in large part because of high-quality videos he makes of his adventures:

https://www.youtube.com/watch?v=Vk6CrWJdRto

(Zahorian's effort set the "unsupported" record, which means he carried everything, including all his food, from the start, and didn't stop at any towns along the way to resupply. Most hikers carry only enough food for 3 to 5 days at a time, and resupply along the way -- understandable because it's much easier than carrying everything from the start.)

Re:What Happens to Your Body on a Thru-Hike by bootload on Thursday February 23, 2017 @04:01AM (#13712581)
"No, although I've done many days of more than 18 miles in the mountains, including 50 mile single-day mountain races."

With a pack? I ask because running over this terrain is hard. Hats off hard. But with a pack, things are different. You don't move as fast. Thanks @hsitz for the video.

"Most hikers carry only enough food for 3 to 5 days at a time, and resupply along the way"

Unsupported. I did't see if the original was unsupported - can't imagine carrying 30 days food. Even the PR1M I've used is pretty heavy. [0] Possible but you'd strip out all but the useful food. With re-supplies, do they have access to water?

"lower level of intensity."

Totally agree with this. Still hard yards.

Reference

[0] https://flickr.com/photos/bootload/4549780731

Re:What Happens to Your Body on a Thru-Hike by rimantas on Thursday February 23, 2017 @06:16AM (#13713036)
But 2.25 miles per hour is not fast. And you get 16hours to rest.
Re:What Happens to Your Body on a Thru-Hike by bootload on Thursday February 23, 2017 @04:17AM (#13712630)
btw @hsitz I ask this question not to be rude, but to work out if overconfidence is driving the answer cf: ~ https://news.ycombinator.com/item?id=13620745
Re:What Happens to Your Body on a Thru-Hike by hsitz on Thursday February 23, 2017 @02:30PM (#13716927)
No worries about offending me. To give you some idea of where I'm coming from, I run, hike, and backpack over 3,000 miles per year, much of it in the mountains, and I'm in my fifties. I have good amount of personal and theoretical understanding of human physiology and psychology in endurance events.

Yes, some people are overconfident. I would suggest that the main problem in the context of endurance activities, though, is that people tend to be underconfident. People never get started because they think they can't do it, or that it would be too hard for them. They hear about people doing something like a thru-hike and they think these people must be gifted, special, or athletic in some way that they aren't.

That thought is almost entirely misguided. Certainly everyone has different abilities. But the vast majority of people out there doing these things have fairly average physical abilities. (For perspective, 2,000+ mile thru-hikes have been completed by children under 10 and people over 80.) They do probably have more motivation and dedication than most people, which are by far bigger determinants of success in these kinds of endurance endeavors than physical ability. But part of getting this motivation and commitment hinges on believing that they have the physical ability to do it (and/or that they can build themselves into physical shape to do it). Hence my post.

BTW, this is pretty much borne out by the guy who wrote the original article we're talking about. He didn't claim to be in great physical shape or have special physical ability, saying:

"Before the hike, I was fit but not training for anything. I ran five miles a couple times a week, went mountain biking about once a week, and periodically lifted weights. Like most Americans, much of my day was spent in front of a computer. I was 35 years old, 5'9" tall, and 150 pounds, with a BMI of 22.2 and body fat composition of about 13 percent."

Re:What Happens to Your Body on a Thru-Hike by bootload on Sunday February 26, 2017 @12:11AM (#13735778)
thanks for the great reply @hsitz. One thing I did notice that as a fitness marker was the authors heart-rate (BPM). His resting heart rate measured at 48bpm. This is unusual and is in the range of ^endurance athletes^. In fact, soldiers are tested on carefully for this marker. It indicates no matter how fit you may be, resting heart-rate is an indicator of ^endurance^ capability. That resting heart rate means he can push a lot further, longer than most people.
Re:What Happens to Your Body on a Thru-Hike by sandeatr on Thursday February 23, 2017 @09:07AM (#13713917)
I'm a thru-hiker. I'm done PCT/CDT & others.

8 hrs & 18 miles/day is pretty slow and short day. This is a novice thru hiker pace, but I doubt they were trying to set any records--

Re:What Happens to Your Body on a Thru-Hike by overcast on Thursday February 23, 2017 @10:36AM (#13714684)
Average walking speed is 3 miles per hour. You're averaging that or greater, through trails / mountains, for 8 hours straight?
Re:What Happens to Your Body on a Thru-Hike by sandeatr on Thursday February 23, 2017 @10:53AM (#13714844)
Yes 3mph is the pace for slightly rough trail. On flat/smooth ground it is slightly faster. Up at altitude & scrambling the pace will drop, but the CT doesn't have much of that. The CT is high altitude but overall fairly easy grade(the CDT has much more challenging sections).

8 hrs is nothing, once you have trail legs many thru hikers will basically walk the entire day. 3*15 = 45 miles per day give or take. In CO it will be slower generally as CO is not the easiest hiking, but still 18 miles/day is very chill pace.

The CT is also only 450 miles, so when they finished, they were just starting to get in shape really. On a longer trail is it generally considered that around 500 miles is where people start to observe really obvious improvements.

Re:What Happens to Your Body on a Thru-Hike by hsitz on Thursday February 23, 2017 @05:32PM (#13718488)
"many thru hikers will basically walk the entire day. 3*15 = 45 miles per day give or take. "

Yes on the many "hike all day" thing, but regarding mileage this is starting to shade off into hyperbole. E.g., when Scott Jurek set the (then) AT speed record in 2015, he averaged 49.2 miles/day, and that was with support (van carrying food, gear, and meeting him for sleeping spot each night, people helping with massage, etc.). And Jurek is (or once was) a world-class athlete.

Heather Anderson set the "unsupported" (she had nobody helping her carry anything and no help with camping or resupplies) AT record, also in 2015, and she averaged just 42 miles/day.

The speed records on PCT are a little faster in terms of miles/day, but not much. So I would not say that "many" thru-hikers are averaging "45 miles/day give or take", although I agree that 18 miles/day is pretty average. A lot of people may hit a 45 mile day somewhere along their hike, but it's exaggerating to suggest that more than a handful average anywhere near that over the entire hike.

Re:What Happens to Your Body on a Thru-Hike by JoeAltmaier on Thursday February 23, 2017 @10:38AM (#13714706)
I took Boy Scouts to Isle Royale (on Lake Superior). Its very rough and challenging. Average hiking speed for visitors is under 2mph.

We averaged 3.5. Carrying heavy packs, every day for a week. All it takes is practice, motivation and youth.

Re:What Happens to Your Body on a Thru-Hike by fian on Wednesday February 22, 2017 @10:46PM (#13711458)
I have done both week long MTB touring off road with about 20kg of gear plus the bike. And 12 day off trail hikes through river gorges and crossing some steep ranges starting with about 24kg on my back.

On the MTB I got more fatigued each day due to the pace we were riding at. This meant we were burning glycogen most of the time. When you run out of glycogen you really struggle to keep pace.

On the hike the pace is usually at a level that allows effecient fat burning. Finding palatable food that has a high enough energy density and protein content to weight is a challenge.

If we rode slower then I would have been less fatigued each day.

Both types of activity are tiring but in different ways. The biggest difference though will come from the pace you set.

Re:What Happens to Your Body on a Thru-Hike by Lio on Thursday February 23, 2017 @06:32AM (#13713095)
To my mind the key difference here is the word 'race'.

Your body will definitely be stressed differently if it's spending a lot of time near (above/below) lactate threshold as might be the case in a long bike race.

In the cycling world that might be called power zone 4(ish).

You'll probably also have to throw in a number of VO2max efforts for small hills; zone 5.

In the case of hiking with a 20Kg pack, in a non-race situation, for 8 hours a day I would guess you'll mostly spend your time at a lower heart rate doing tempo work, which would mostly be zone 2.

This is somewhat similar to the long, slow, steady training winter bike training that was popular before current practices of interval based training became popular. It is designed to improve muscular mitochondrial density.

Another way to put it, if the through-hike had been a race against the clock the hiker might have been much more degraded by the end of the race because he wouldn't be able to pace himself the same way.

I'm not a qualified sports scientist so would very much appreciate someone with more knowledge than me clarifying or correcting anything I've written.

Re:What Happens to Your Body on a Thru-Hike by justinator on Wednesday February 22, 2017 @08:37PM (#13710909)
All these mountain bike races are self-supported, so they're actually very similar in the amount of gear carrying by someone doing a thru-hike with UL equipment, as you're carrying everything you'll need from start to finish, including your sleep system. Much of the course for say - the Colorado Trail is difficult enough you're not riding the bike: you're pushing it. This sort of thing [0]

I've actually considered trying to hike the Colorado Trail unsupported - carrying everything I'll need from the start (except water) with NO resupplies until the end. My target time would be around 9 days. If you're trying to gauge how strenuous the types of effort I put forth when I go and do the things I do.

Anyways, 8 hours seems like an easy day on the trail for sure. 8 hours hike + 8 hours sleep leaves you 8 hours for $Other_Things. Might as well hike some more!

[0] https://www.youtube.com/watch?v=tyznXGXiSDk

Re:What Happens to Your Body on a Thru-Hike by bootload on Wednesday February 22, 2017 @10:31PM (#13711403)
"My target time would be around 9 days. If you're trying to gauge how strenuous the types of effort I put forth when I go and do the things I do."

These are good points. The distance this bloke covered was 800km. Every day another 30km. That is hard.

Re:What Happens to Your Body on a Thru-Hike by kdbg on Thursday February 23, 2017 @04:44PM (#13718099)
The current FKT for an unsupported CT hike is 9days 12hours and 32minutes. (Set this past season)

So, a 9Day pace would be a new record if you went for it.

Re:What Happens to Your Body on a Thru-Hike by dasil003 on Wednesday February 22, 2017 @08:13PM (#13710808)
Over the same distance sure, but have you ever raced mountain bikes? The broken terrain thing applies as well. And the increased efficiency just translates into more speed and distance. You might think descending 10k feet on a bicycle is cake compared to hiking, but packing that elevation drop into a tiny fraction of the time leads is actually a fairly intense upper body workout.
Re:What Happens to Your Body on a Thru-Hike by bootload on Wednesday February 22, 2017 @10:30PM (#13711399)
"have you ever raced mountain bikes?"

No. I think the OP was referring to road racing. One question, "do you carry the bikes uphill?"

Re:What Happens to Your Body on a Thru-Hike by dasil003 on Thursday February 23, 2017 @01:15PM (#13716221)
When you hike do you ever jump down a 20-foot cliff?

It's asinine to get into this dick measuring contest, you shouldn't claim your sport is more hard-core than a sport you don't know. This mentality is why Lance Armstrong got his ass handed to him the first time he tried mountain bike racing because he thought it would be easy. And yes, there are race format where you carry bikes uphill: https://en.wikipedia.org/wiki/Cyclo-cross.

Re:What Happens to Your Body on a Thru-Hike by rconti on Thursday February 23, 2017 @12:27PM (#13715719)
That sounds fine. I haven't done it for 500 miles but I've done it for 50mi, 40lb pack, all over 7000ft. Yeah, you're VERY tired at the end of the day, but I'd never compare it to racing anything but a car.

I've done 100- and 200-mile bike rides in one day, and foot races up to half marathon, and I'd absolutely consider those to be harder.

For one, the backpacking I could get up and do TOMORROW. The racing, not so much.

And the racing I could not do 2 days in a row. The backpacking I could do, again, tomorrow, for 2 weeks, without a doubt.

Re:What Happens to Your Body on a Thru-Hike by diebir on Wednesday February 22, 2017 @11:36PM (#13711668)
Experienced thru hikers have packs with base weight of 6-7kg in summer. The total with food and water 9-12kg.
Re:What Happens to Your Body on a Thru-Hike by deepGem on Thursday February 23, 2017 @03:24AM (#13712479)
Man, how did you survive on 5 hours of sleep ? I rode my bike for 200 km in 11 hours and post that, slept like a log for 9 hours. I mean, I was knocked out. Couldn't open my eyes despite alarms.
Re:What Happens to Your Body on a Thru-Hike by xorcist on Thursday February 23, 2017 @05:15AM (#13712829)
I can't understand it either, I'm absolutely exhausted from _one_ day of biking. But check out things like https://en.wikipedia.org/wiki/Trans_Am_Bike_Race and the https://en.wikipedia.org/wiki/Transcontinental_Race for the really extreme stuff.

There's a great documentary about Transcontinental race from 2015 at https://vimeo.com/ondemand/transcontinental which is well worth watching. Seems to be behind a (cheap) paywall now but it's well worth it as an intro to how it's done.

It's absolutely mesmerizing to watch for regular crazy people (as opposed to the crazy crazy people who partake) and there is some great behind the scenes footage on youtube. These races are great to watch in real time because you can follow every GPS tracker and since each rider chooses their own directions it can get really exciting.

Re:What Happens to Your Body on a Thru-Hike by ska on Thursday February 23, 2017 @10:43AM (#13714759)
If you are unused to it, this sort of thing is a real shock to the system, but your body is more adaptable than you might think.

On the other hand, there are limits. Some of the scenarios discussed int this thread (distance races for time, SF training, etc.) are causing damage to your body that will require recovery time - and the longer you go for the more recovery you will need. Other levels of exertion seem extreme to us from the point of view of a mostly sedentary life, but if you manage the sleep and diet stuff (a bit better than a typical thru hiker does), you can handle medium-high level physical exertion (e.g. 8 hours hiking) basically indefinitely.

I've done multiple 1000km bicycle rides (with full gear) at a similar pace that, once you are settled in, feels a bit just like routine. On the other hand I've ridden distances on a single day or weekend that knocked me out for a week afterwards. It's all in the balance.

Re:What Happens to Your Body on a Thru-Hike by gaius on Thursday February 23, 2017 @09:01AM (#13713882)
The US Army's Ranger School is 8 weeks on 2 hours of sleep a night, apart from one night you are allowed 5 hours because there's a parachute jump the next day...
Re:What Happens to Your Body on a Thru-Hike by ska on Thursday February 23, 2017 @10:46AM (#13714782)
NB: The point of things like that is to explore failure boundaries, not a sustainable activity level.
Re:What Happens to Your Body on a Thru-Hike by ryanmarsh on Thursday February 23, 2017 @10:28AM (#13714617)
Don't forget the malnutrition and that it takes a year to recover from.
Re:What Happens to Your Body on a Thru-Hike by gaius on Thursday February 23, 2017 @11:04AM (#13714944)
I'm just a civvy and obviously don't know anything, but I've always found what I've heard/read about Ranger School puzzling. Does it really produce something that cannot be produced any other way? Why does no other military have something like it?
Re:What Happens to Your Body on a Thru-Hike by pixelbreaker on Thursday February 23, 2017 @10:44AM (#13714767)
I raced Tour Divide in 2015 too (21 days), slept an average of about 5 hours a night, until New Mexico, which I rode the entirety of on 5 hours sleep. I was utterly destroyed by the end of it. I went from 78kgs in Banff, to 69kgs in Antelope Wells. My resting heart rate was already low (around 45) by the end it was more like 35.

Agreed with other comments on here, the thru-hike is a totally different situation, and 8 hours a day hiking is half the time I was on a bike probably.

I'd love to do it again!

He's the strava activity https://www.strava.com/activities/341380125

Re:What Happens to Your Body on a Thru-Hike by ObeyTheGuts on Thursday February 23, 2017 @06:27AM (#13713074)
When i walk all day i sleep 12 hours, in morning i feel like i want to continue this way instead of noooooo no more walking! Sleep deprivation is just ridiculous, water sleep and food should be plenty in any of long strenous things or else its just self destruction madness
Re:What Happens to Your Body on a Thru-Hike by rsync on Thursday February 23, 2017 @10:41AM (#13714733)
"When i walk all day i sleep 12 hours"

I wish there was some perma-link from:

- HN comment threads about insomnia (lightbulb colors, screen brightness, silly apps)

- HN comment threads about light to moderate exercise

It's amazing how simple the answers to these problems are and how close at hand those answers are ...

Re:What Happens to Your Body on a Thru-Hike by Bartweiss on Thursday February 23, 2017 @11:31AM (#13715162)
I agree that people often miss the easy answers on sleep. It's important, though, that light/dark and exercise are not interchangeable sleep aids. Very, very broadly:

Light issues are about melatonin, which is production-inhibited and rapidly destroyed in the presence of blue light. Increasing melatonin levels is the point of Flux and blue glasses and all the rest.

Exercise issues are about adenosine, which is produced over time and gradually with physical activity, and consumed during sleep. (It's also what caffeine inhibits.)

These aren't entirely interchangeable, so there's more to be gained from addressing whichever one is the largest personal issue. (Anecdotally, I have a suspicion that the feeling zombie-tired insomnia is about a bad mismatch from sedentary tiredness.)

I do think that people preferentially worry about light issues without trying exercise, though.