tl01

macrumors 68020
Original poster
Jun 20, 2010
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Maybe it is just a honeymoon phase...but I just did my first work with my series 4...I used my ProForm HIIT trainer and when I did that with my series 3 often when I would check my heart rate it would be searching for it but today with my series 4 it kept track of it each time I checked it. I will be interested to see if it can keep track of my heart rate better while I am doing my other workouts that involve different movements. Anyone else notice more accuracy?
 

Monkswhiskers

macrumors 6502
Feb 6, 2018
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I would also be interested in accounts of the new optical sensor. The previous version was the best in it’s class but still suffered from discrepacies in certain situations.
 
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tl01

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Original poster
Jun 20, 2010
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Come on! Someone must have worked out today! I’ll work out again tomorrow and report my experience.
 
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matrix07

macrumors 604
Jun 24, 2010
6,708
3,326
Maybe it is just a honeymoon phase...but I just did my first work with my series 4...I used my ProForm HIIT trainer and when I did that with my series 3 often when I would check my heart rate it would be searching for it but today with my series 4 it kept track of it each time I checked it. I will be interested to see if it can keep track of my heart rate better while I am doing my other workouts that involve different movements. Anyone else notice more accuracy?

It’s already better on my S3 with watchOS 5. No wonder you see improvement in S4.
 
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Lloydbm41

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Oct 17, 2013
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Central California
Maybe it is just a honeymoon phase...but I just did my first work with my series 4...I used my ProForm HIIT trainer and when I did that with my series 3 often when I would check my heart rate it would be searching for it but today with my series 4 it kept track of it each time I checked it. I will be interested to see if it can keep track of my heart rate better while I am doing my other workouts that involve different movements. Anyone else notice more accuracy?
I used my Pro-Form elliptical for my daily workout. I always use the built in exercise tracker and never had an issue with the Series 3, and no issue with the Series 4. Used it yesterday and today. No problems.
heartrate.JPG
 
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chanerz

macrumors 65816
Jul 7, 2010
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When I jog, I usually pair my S3 with Scosche heart rate band. Took my S4 for a run and it tracked my HR well.
 
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actcyclist

macrumors 6502
Jun 10, 2017
317
449
Yes, since Friday I've noticed the HRM is far more accurate. I've done a hike up a hill, walk, cycled 45km and 2 kettlebell workouts.

Cycling is the hardest thing for a watch HRM to do because of the bumps from the road, and it did it far better than the 3.
 
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ipaine

macrumors regular
Apr 21, 2015
115
30
I’ve noticed a real difference since upgrading to OS5. I do a combination of strength training, cycling and running. Particularly with strength training, my S3 on OS4 would often cut out or be slow to keep up, which may have meant that my calorie burn was less accurate (important for me because I track my calories).

OS5 seemed to make the refresh rate a lot more frequent. I upgraded to an S4 on Friday and have not seen a huge difference between it and the S3 on OS5. Very happy either way - I was considering getting a heart rate strap but this seems unnecessary now!
 
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jon08

macrumors 68000
Nov 14, 2008
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People with S4 please do post about your findings regarding the heart rate tracking... I'm also interested if there has been an improvement. Tks.
 
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John-F

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Oct 7, 2011
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I do high intensity interval training and I have found in the past that wrist based HR measurement does not keep up with the almost instant HR changes. Similar experience with AW Series 2 and 3 along with Suunto Spartan and Garmin Fenix 5X. This thread has encouraged me to try with my Series 4. I'm suspecting the limitation I experienced results from the nature of wrist HR measurement and not the specific monitor, but it's still worth checking out.
 
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Deguello

macrumors 65816
Jun 29, 2008
1,042
562
Texas
Yesterday, indoors, the Watch was crazy high on my heart rate. Something like 150 instead of 120, as measured by my Fitbit Alta HR and counting it manually.

This morning, outdoors, it was within 3 BPM of the Fitbit. I was very pleased. Not sure why the difference between the two days, but I’m going to keep comparing them as I maybe wean myself off the purely steps-based way I've been doing things and see how things work for me with Activity goals.

Also, I walked for a little over an hour, listening to music, gps on, WiFi on, cellular on, tracking the workout, and had 89% battery remaining. I think I can live with that.
 
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Newtons Apple

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Mar 12, 2014
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Come on! Someone must have worked out today! I’ll work out again tomorrow and report my experience.

I did this am. Walked 2 miles on my Matrix treadmill. My watch indicated heart rate was within two beats of my Polar chest strap. Perfect in my opinion, it tracked is well even in recovery.
 
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rcarter3636

macrumors member
Mar 11, 2015
90
13
Even though the Watch 4 has 2nd generation heart rate sensor, I believe there were changes made in the latest software update. I still use AW3 and see significant changes than before update. Calorie burned on run/walk are a lot higher (closer to Garmin now) but the steadiness of the heart rate reading while doing tennis and weightlifting still amaze me. Calorie burn seems the same as before with other exercises except running or walking for me.
 
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tl01

macrumors 68020
Original poster
Jun 20, 2010
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Interesting. I don’t usually upgrade my devices to the latest OS until I have the new device in hand. I like everything about the new device to be new so I wait the week. I didn’t ever put OS5 on my s3 until yesterday when I gave it to my son. Maybe I’ll wear it for a workout and see how it tracks!
 
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ryanmp

macrumors regular
Dec 6, 2016
106
168
Just went for a run with my new S4. Significant improvement in heart rate versus my S2.

I did intervals during the run and usually my old S2 loses my heart rate, particuarly on a hot day like today. The S4 was flawless, no drop outs. Interestingly when I’m pushing myself and my heart rate is high, that was usually when the S2 lost it, but no issues with the S4. Very happy.

Beyond that, the speed of the system is great. So much easier to switch between workout and music, particuarly with the bigger screen and bigger buttons.

I run the same route quite often and looking at my GPS track, the S4 seems to have better GPS than my S2, which tended to be a bit wobbly with the tracking.
 
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dokindo

macrumors regular
Feb 4, 2009
233
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I just did a HIIT workout with kettlebells, and unfortunately I found no improvement with my S4 vs S3. I’ll have to go back to using my wahoo..
 
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CreepyAF

macrumors regular
Sep 23, 2018
214
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Behind you
i swam for 45 minutes yesterday and it measured my HR... not sure if it's accurate tho. just amazed that it can read my HR in a pool full of water.
 
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Monkswhiskers

macrumors 6502
Feb 6, 2018
335
224
I believe this has always been the case with the Apple Watch, or at least since Series 2
Yes but someone mentioned that S4 has just one green led on the optical HR sensor but looking at the specs there are 4 tiny IR sensors.
 
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John-F

macrumors regular
Oct 7, 2011
235
893
So far looks good with interval training with the S4. The HR graph shows a clean sawtooth pattern which is good. I still need to graph workouts using both the S4 and a chest strap with a Garmin Forerunner. Will be interesting to see if there is any time lag between the two.
 
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redavis41

macrumors member
Sep 14, 2017
96
43
I've done one strength training workout (chest and biceps routine) and was quite impressed with the optical sensor HR reading. I want to do some more comparisons before I commit to utilizing the OHR a bit more than the Chest Strap. I'm optimistic though.
 
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MacWorld78

macrumors 6502
Jul 25, 2012
441
192
This morning I was jogging on the treadmil. Mind you this is old TechnoGYM treadmill that will not pair with the apple watch.

TechnoGYM: 263 Calories & Distance 3.53km (2.19 Miles)
AW4: 344 Calories & Distance 3.16 Miles

Different between TechoGYM & AW4 81 Calories & Distance 0.97 Miles.

I'm not sure which method is far more accurate TechnoGYM or AW4, I'm gonna try again in few days time - they have 20 treadmills :eek:

I think my Heart rate is accurate 175BPM during the excerise.

GYM.JPG
 
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seble

macrumors 6502a
Sep 6, 2010
957
148
I posted a thread about this earlier today, but my take on it was the HR sensor is much much improved! Far Better for strength training / weight lifting!
 
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ap105

macrumors regular
Mar 17, 2011
151
23
How about this: Maybe the WatchOS 5 is improved - no doubt gen2 HRM is probably better but could it be the OS. I saw somewhere that they are now using machine learning for the HR in OS5.
 
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