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Data Recording Equipment....

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.

ILDiver

I just wanna dive
Jul 11, 2005
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Does anyone know of heart monitoring equipment that can be used to collect data for freediving?

A friend and I are wanting to collect a variety of data in and out of the water, but finding a method to collect heart rate and other pysiological function is not going well for me at the moment.

I have a Suunto t6c monitor. I'm sure with some help I could modify a comfort strap to connect to leads and put the transmitter and watch into a sealed container. But if there is a means already....

Thanks!!
 
Try checking some older threads about oximeters (sometimes incorrectly spelled oxymeters). They typically monitor heart rate too. If I remember well, Eric Fattah uses one with chest-strapped sond, Jome tested several of them, and there are many other members who used such equipment.

Look for example at these threads:

http://forums.deeperblue.com/general-freediving/76065-heart-rate-monitor.html
http://forums.deeperblue.com/freedi...9555-compare-our-outputs-pulse-oximeters.html
http://forums.deeperblue.com/static-dynamic/68356-pulse-oximeter.html
http://forums.deeperblue.com/freediving-training-techniques/58675-accuracy-oxymeters.html
 
Reactions: ILDiver
I've read some of those in the past and another fairly recent. I didn't see anything that really worked out well. I've thought the pulse ox would be cool, but (as mentioned in the threads) the vasocontriction seems like it would cause false readings.

I bought the t6c for dry land training to increase my respititory and cardio health in an optimal fashion. The features that it contains is amazing and suprisingly accurate for the method in which it collects it's data. It does have a problem with respiritory rate while holding your breath as it's measuring it based on time between heart beats. But that portion of data is not important during the time I'm wanting the data. I'm wanting heart rate over several dives to track the trends. It would also be used in statics and dry land to compare reactions in different environments.

So, my thought is, if I could get a second strap and modify it.... There are two pads that collect data, they align under each nipple. The only issue with the current strap is that the ANT signal will not pass though water. So if I could build leads that would wire into the strap and then a use disposable leads like they use in medical testing that adhere to the skin. I could build a small tube of plexiglass tubing and cap the ends sealled with an o-ring and all. Place the transmitter and the watch in the tube and seal it up. The leads would then have to come through the side of the tube and be sealed in place with epoxy.

That is my thought on getting it to work out. I know on Ocean Men Pipin has a rig he wore that a doctor hooked to him and collected data. But it was on a sled. I'm thinking this one could be small enough to attach to a weight belt.

Any other ideas for something on this?
 
Chris,

In the past I used a cheap Polar Heart rate monitor under my wetsuit down past 20 meters and it worked just fine.

Since it was a cheaper model there was no data recording feature so I couldn't download it afterward.

I had no issues with the signal working in the water. Maybe some of the newer models have data recording that you can download.

Jon
 
When I was looking around I could not find any that talked about working at depth. The older signal worked in water though. The newer, coded ones do not. When you get into the models that download, the price goes up and it becomes less disposable.

I'm looking for a solution for Jeremy, well for me so I can ask Jeremy questions . It's a project he is wanting to research and I am interested in the results too, but mine can be less scientific than his needs will be.
 
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I was part of a research study here at the UW where they had me swallow a pill that had a tiny thermometer in it. I then had to hold some kind of waterproof box next to my chest that had the recording device in it- it was just a standard Pelican box. I than laid in the bottom of a pool for an hour while they recorded my air consumption and body temperature. The same was repeated with me sitting in a chair on land.

Not sure what kind of tools they used, but the Pelican box wasn't exactly high tech. rofl

Maybe it's time to scour Ebay for an older heart rate monitor?

Jon
 
Jon said:
I than laid in the bottom of a pool for an hour while they recorded my air consumption and body temperature.
Jon
Click to expand...

Thats some static Jon.
Eric F I am sure would have some information on some equip Ildiver if he does not see the thread maybe try a pm to him.
 
I had a go with the galileo & freediving beta software in Egypt then again in the Bahamas. Aside from some problems with the HR monitor reading left/right ventricles as separate beats when HR dropped it was pretty good. I think my HR went from 120bpm at the surface down to 60bpm at 85m (almost linear).
 
rbsub said:
But not the cheapest solution.
Click to expand...
Freediving computer with built-in oximeter and HR monitor for $800 (540€)? In comparison with Suunto D4 that is just a diving computer and nothing else, and is not really significantly cheaper, it looks like a pretty decent deal. I think I know now what I want as my future dive watch. Thanks for the link!
 
Trux, for your information: As far as I know the Terra is not delievered with the freediving software. The software I saw was still in beta. And there is no built-in oximeter.

The concept of this computer is that you buy a computer with standard modules (gauge, deco etc.) and you can buy additional software like trimix, heard rate monitor (being free of charge for the moment (Promotion!)), freediving and so on. But I don't know that exactly!!!!

Would be nice to have this computer with the freediving software only for a nice price .
 
We had one in our shop and I was VERY interested. But $1800 or what ever it was.... Plus it's size. It has a TON of features though, I was impressed. You can load "slates" to it, the compass... it is impressive

EDIT - We had the SOL. I did not know they had the Terra. Wonder if we can get those in the states...
rbsub said:
Have a look here

GALILEO TERRA - SCUBAPRO-UWATEC


But not the cheapest solution.

AFAIK they have an integrated software for freediving, too. I saw it a couple of months ago by a German freediver who tested it.
Click to expand...
 
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I'm looking for an an oximeter that is not a fingertip meter. I've seen a "patch" sized on that was talked about in 2005 but I can not find any recent info. I'm thinking with blood shunt the fingertip only tells you when the shunt occurs. I'm looking for something like this patch I saw hoping it would read at the core.

Still researching.
 
As Fergus wrote above, ping Eric Fattah. It looks like he did not discover this thread yet. He wrote in older threds he was using a chest mounted oximeter - it should be more reliable. Also earlobe oximeters work better than fingertip devices, and are often quite inexpensive (though finding a cheap one that is waterproof and depth resistant may be more complicated)
 
Seeing as you already own a T6c, you might have a bit of luck with that. The signal can transmit a small distance underwater, so you can put the watch in the suit next to the belt. Sure it's not ideal, but if you just want to do it a few times, it works fine.

I have a T6 with the old-style belts. Unfortunately, they aren't waterproof below 5m or so. You may have better luck with the comfort belt. Lemme know how you get on!
 
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