[luqtas]

various resources from universities recommend having your forearm angled between 90-120°, which if it's > 90°, an front angulation doesn't make sense at all... [0]

> Also, your link is about mice not keyboards, and about angling mice sideways

the author points out another research, i should have linked it instead of that one [1]... but it's about the ideal slanted angle considering how our muscles are structured; the author even cites that suggestions as something not taking relative preferences, which is totally fair as some people may use their computers for a short time in very awkward positions and that's fine

[0] https://www.sciencedirect.com/science/article/abs/pii/S10506...

[1] yet about mouse but please take your time to read what's was typed in the paper regarding the slant angle suggestion -- https://www.sciencedirect.com/science/article/abs/pii/S02680...

[crazygringo]

> recommend having your forearm angled between 90-120°

That's what I said ("your forearm should be generally be about horizontal (or a little bit downwards is OK too)"). Never upward.

> which if it's > 90°, an front angulation doesn't make sense at all.

If you want a 10° downwards angle on the keyboard relative to your forearm and your forearm is 5° upwards, then your keyboard still needs 5° downward relative to your desk. If your desk is so high that your forearms are angled up 20° from the horizontal, then something is extremely wrong with your chair/desk height.

And your first link supports exactly what I wrote:

> The natural position of your hands with respect to the relative vertical position at the wrist is along the plane or below it (i.e. you want the tips of your fingers to be at the same height as your wrist or preferably slightly lower). When your hand rises above this plane (making the hand signal for 'STOP'), this is called dorsiflexion or wrist extension. This greatly reduces blood flow through the wrist and can quickly cause pain, fatigue and numbness. Most keyboards have a 'foot' located at the back of the keyboard which is not desirable as it creates a positively inclined keyboarding surface. Many articulating arms offer the option of a negative inclination, which will make the entire work surface slope away from you, ensuring that your hands are not 'bent' upward at the wrist.

And I don't know why you've added another link about sideways mouse slant. That has nothing to do with up-down keyboard/arm angle. If there's some relevant sentence in it, please quote it, because I can find nothing relevant in the publicly available text.

You ask me to "please take your time to read" -- I suggest you take the time to re-read your own first link. It makes clear there is no situation where a keyboard angled upwards (the back of the keyboard elevated) is good ergonomics -- exactly what I said.

[luqtas]

you are right, i always considered the front of the keyboard what you considered the back, sorry for this (and by the way, i changed the link to a more generic one citing the variation of 90° -> 120° i typed of one easily finding by surfing the internet)

on the 2° paper, > Among the five tested mice, the 25° or 30° slanted mice caused lower muscle activity and more neutral working postures for ECU, Trap and PT muscles.

these muscles are also used during keyboard usage. slant angle is always suggested on ergonomic research, as our arms muscles are tensioned/twisted when using a flat keyboard/mouse... you can easily find research pointing slant angle on ergonomic keyboards but the research i pointed out is interesting as the author actually studied which is the optimal angle based on our anatomy (there's tension/forces on greater slant angles to maintain the posture, as there aren't surfaces to support our hand) and not on individual preference

[crazygringo]

No worries! Just trying to save people from wrist pain. :)

And yes -- slanting the keyboard that way is usually called keyboard tenting. Also highly recommended, but difficult to implement in practice because it requires an even lower base for the keyboard, and there aren't many good accessories out there for it, sadly...

I'm still waiting for someone to sell a cheap kit for angling keyboards downwards and implementing tenting. It's kind of complex to do both at once...

[jjani]

I'd love an accessory that makes a keyboard completely flush with the surface it's on. I get this is hard because dimensions are different for each keyboard, but something that e.g. a Macbook fits into would be nice, given its standard size. Everyone's different but for me personally, I feel that would be a big ergonomic benefit. Supported by the fact that my current winner is the one coming closest to this ideal, being extremely low, maybe ~0.4cm from the surface.

Been toying with the idea of getting something 3d-printed, basically something just as high as a Macbook, that you can attach to the front of it, giving a flush surface. Even better would be carving a Macbook-bottom-shaped or external keyboard-shaped "recess" into a table to place it into.

Ever seen or heard of anything like this?

[yencabulator]

Ergodox has a design where the keyboard can sit on 3 adjustable legs, and you can get both a downward angle and tenting out of that.

The downside is that you really need to get your desk way low for your arms to naturally "droop" down over that. I have a motorized sit-stand desk I bought specifically after comparing specs on how low the desk surface can go, and the position that's low enough while seated is basically as low as my knees will let it go. A separate keyboard tray would be great but they rarely have room for the footprint and height of a tented keyboard with a touchpad in the middle.

Standing up, it's a lot easier to find a good height.

https://ergodox-ez.com/

[crazygringo]

Those legs look amazing.

I want to be able to buy them as an adhesive add-on for any (split) keyboard!

[yencabulator]

I don't think glue will hold them well enough. There's a metal thread in the keyboard for a reason. The angle is adjustable and tightening the nut locks the foot at that angle.