27 Feb 2007 19:05:00
Joshua O
heart rate slows as you run?

I'm training for my first 10-miler and had my longest run yet today at
8 miles. (I'm two months into a three-month training program pulled
from Runner's World.)

As I was running today I noticed somewhere around the 6 mile mark that
my breathing had slowed down quite a lot. I looked at my heart
monitor (Garmin 305) and my heart rate had also slowed way down to
around 115 bpm. Normally when I run it hovers around 180. It stayed
like this for the last 2 miles or so of my run.

Is this common? I feel fine and did throughout the run, but should I
be concerned here? This is about two miles longer that my previous
longest run.

Here's a graph of my heart rate over the distance:

http://sivro.net/8mile_heart.jpg

The software I used to generate that image doesn't do data smoothing
at all so you should ignore the erratic spikes and picture a more
smooth-fitting line.

And to show it wasn't a pace thing, here's the same graph again but
with my running speed overlaid in purple:

http://sivro.net/8mile_heart2.jpg



28 Feb 2007 04:04:06
Elflord
Re: heart rate slows as you run?

On 2007-02-28, Joshua O <[email protected] > wrote:
> I'm training for my first 10-miler and had my longest run yet today at
> 8 miles. (I'm two months into a three-month training program pulled
> from Runner's World.)

The readings on the monitor are probably wrong.

For a number of reasons, it's possible to get dropouts late in the workout
(e.g. too much sweat, not enough moisture, monitor not properly positioned)

Usually, it's almost perfectly linear with pace (several of us have tested
this theory ourselves!), though it tends to drift upward slightly during a
long run.

Cheers,
--
Elflord


27 Feb 2007 20:50:01
D Stumpus
Re: heart rate slows as you run?


"Elflord" <[email protected] > wrote

>> I'm training for my first 10-miler and had my longest run yet today at
>> 8 miles. (I'm two months into a three-month training program pulled
>> from Runner's World.)
>
> The readings on the monitor are probably wrong.

It's also possible that you have a heart rhythm irregularity that causes a
bad read of your heart rate, probably less likely than an equipment
malfunction, but you might want to check it out if you can make it happen
regularly...

If you stop and quickly take a manual pulse, and it's really 115, and you're
running the same pace you ran at 180, then you are superhuman....As Donovan
said, heart rate and speed are pretty linear. Most likely you will get
your 180 heart rate. (I count for 6 seconds and multiply by 10 to get a
rough idea).



--
Posted via a free Usenet account from http://www.teranews.com



28 Feb 2007 10:59:33
Steve K
Re: heart rate slows as you run?

Joshua O <[email protected] > wrote:

> As I was running today I noticed somewhere around the 6 mile mark that
> my breathing had slowed down quite a lot. I looked at my heart
> monitor (Garmin 305) and my heart rate had also slowed way down to
> around 115 bpm. Normally when I run it hovers around 180. It stayed
> like this for the last 2 miles or so of my run.
>
> Is this common? I feel fine and did throughout the run, but should I
> be concerned here? This is about two miles longer that my previous
> longest run.
>
> Here's a graph of my heart rate over the distance:
>
> http://sivro.net/8mile_heart.jpg

As Donovan suggested, a drop from 180 to 115 bpm whilst keeping the same
pace is most likely down to monitoring errors. From the graph, it looks
like you have good readings until around 2.5 miles, and then things get
very erratic. I've seen similar with my Forerunner 305 when the heart
rate strap has been too loose, and also when the battery needed
changing.

However, I have noticed slight downward trends with my own heart rate
during longer runs. On 20+km runs at a constant 5min/km pace over flat
roads, my heart rate will raise to around 145bpm and stay within a few
beats of that until 12km or so, after which it slowly drops down to the
mid 130's. After a few more k's it slowly rises again and ( depending
on dehydration level, ) starts to head into the 150's.

I notice the same thing on almost all 'easy' runs, over various
different routes, and the dip in heart rate is obvious on otherwise
fairly smooth graphs. The run 'feels' easier during that 12-18km
section, although I wouldn't rule out a physiological impact of noticing
the lower bpm on the Garmin display ;-).



28 Feb 2007 06:14:38
Al Bundy
Re: heart rate slows as you run?

On Feb 27, 10:05 pm, "Joshua O" <[email protected] > wrote:
> I'm training for my first 10-miler and had my longest run yet today at
> 8 miles. (I'm two months into a three-month training program pulled
> from Runner's World.)
>
> As I was running today I noticed somewhere around the 6 mile mark that
> my breathing had slowed down quite a lot. I looked at my heart
> monitor (Garmin 305) and my heart rate had also slowed way down to
> around 115 bpm. Normally when I run it hovers around 180. It stayed
> like this for the last 2 miles or so of my run.
>
> Is this common? I feel fine and did throughout the run, but should I
> be concerned here? This is about two miles longer that my previous
> longest run.
>
> Here's a graph of my heart rate over the distance:
>
>
>
> The software I used to generate that image doesn't do data smoothing
> at all so you should ignore the erratic spikes and picture a more
> smooth-fitting line.
>
> And to show it wasn't a pace thing, here's the same graph again but
> with my running speed overlaid in purple:
>

Oh no! Here's a new one captivated with his technology to the point of
losing all common sense. Your heartbeat ain't going from 180 to 115
unless you're feeling "the big one."
After two months you ought to be running 10 miles with ease already.
Instead, you are trapped in the grasp of a magazine and a heart
monitor.



28 Feb 2007 13:29:54
Sofa - Spud
Re: heart rate slows as you run?

On 28 Feb, 03:05, "Joshua O" <[email protected] > wrote:
> I'm training for my first 10-miler and had my longest run yet today at
> 8 miles. (I'm two months into a three-month training program pulled
> from Runner's World.)
>
> As I was running today I noticed somewhere around the 6 mile mark that
> my breathing had slowed down quite a lot. I looked at my heart
> monitor (Garmin 305) and my heart rate had also slowed way down to
> around 115 bpm. Normally when I run it hovers around 180. It stayed
> like this for the last 2 miles or so of my run.
>
> Is this common? I feel fine and did throughout the run, but should I
> be concerned here? This is about two miles longer that my previous
> longest run.
>
> Here's a graph of my heart rate over the distance:
>
> http://sivro.net/8mile_heart.jpg
>
> The software I used to generate that image doesn't do data smoothing
> at all so you should ignore the erratic spikes and picture a more
> smooth-fitting line.
>
> And to show it wasn't a pace thing, here's the same graph again but
> with my running speed overlaid in purple:
>
> http://sivro.net/8mile_heart2.jpg

I don't think you should worry , it sounds like you are getting very
fit and have reached a breakthrough with your running - you can
increase the extra 2 miles easily over the next month and you might
not even notice. If HR is an issue then it's best to take it at rest -
whilst in bed first thing, then after a run , then a few hours after
to see how long it takes to get back to normal.

It's little more than interest to me but to my wife, who is training
for her first 10K after building up for 10 months , kept a check early
on as she used an Inhaler which increased HR . Now , fitter, she uses
it less and her esting HR is much much lower.

Keep up the top work!!



04 Mar 2007 21:42:02
Hans
Re: heart rate slows as you run?


"Al Bundy" <[email protected] > schreef in bericht
news:[email protected]

> After two months you ought to be running 10 miles with ease already.

Why?




05 Mar 2007 00:53:04
Sofa - Spud
Re: heart rate slows as you run?

On 4 Mar, 20:42, "Hans" <[email protected] > wrote:
> "Al Bundy" <[email protected]> schreef in berichtnews:[email protected]
>
> > After two months you ought to be running 10 miles with ease already.
>
> Why?

If he is at 8 miles now and comfortable then another 2 in 2 months is
OK.



05 Mar 2007 09:03:14
runsrealfast
Re: heart rate slows as you run?

On Feb 27, 10:04 pm, Elflord <[email protected] > wrote:
> On 2007-02-28, Joshua O <[email protected]> wrote:
>
> > I'm training for my first 10-miler and had my longest run yet today at
> > 8 miles. (I'm two months into a three-month training program pulled
> > from Runner's World.)
>
> The readings on the monitor are probably wrong.
>
> For a number of reasons, it's possible to get dropouts late in the workout
> (e.g. too much sweat, not enough moisture, monitor not properly positioned)
>
> Usually, it's almost perfectly linear with pace (several of us have tested
> this theory ourselves!), though it tends to drift upward slightly during a
> long run.


During the birth of our second child, at about 3 am a nurse came
running into the room thinking something was wrong. Both the babies
heart rate and my wifes had basically crawled to a halt. Well, my wife
had adjusted her self to get comfortable while she was sleeping (this
was all before the baby was born) and had "adjusted the equipment. The
nurse at the station must have gotten an alarm or somethnig. They
readjusted and things were normal, although my wife was now mad
because she was awake. Anyway, I would venture to guess a similar
thing would go on during a run. Your HRM might adjust with all the
movement and sweat. Also at least for me my muscles can increase in
size during workouts. All these factors might help for an incorrect
reading, giving you the wrong impression.

John