Profile

Cover photo
Jonathan Savage
Lived in Charlotte, NC, USA
731 followers|646,072 views
AboutPostsPhotosYouTube+1's

Stream

Jonathan Savage

Shared publicly  - 
 
I've made some changes to the way I calculate GPS Accuracy. For those interested in the details, see http://fellrnr.blogspot.com/2015/08/changes-to-gps-accuracy-testing.html
3
Add a comment...

Jonathan Savage

Shared publicly  - 
 
I've updated my review of the Altra One for the 2.5 version, including comparisons with the previous version, Hoka Clifton 2, Asics Hyper Speed, NB RC5000, and Asics GT 2000. http://fellrnr.com/wiki/Altra_One
2
Add a comment...

Jonathan Savage

Training Tips  - 
 
More on the myth of Tempo Runs. I found a paper that tempo training is the most effective you can do and quoted 3 references, none of which supported the claim. It shows you have to check the references. http://fellrnr.com/wiki/Tempo_Runs
6
1
John Gist's profile photo
Add a comment...

Jonathan Savage

Shared publicly  - 
 
Two samples of UCAN "superstarch." Most reviewers would just try them on a run and tell you how they taste. Sadly, my obsessive nature means I'll have to do a glycemic index test, which means stabbing myself with needles and testing my blood sugar for a couple of hours. The samples are 37g each, so I could do one test with the standard 50g, or two tests with the smaller sample size. Thoughts?
1
Terry Benzie's profile photoAaron Stone's profile photoJonathan Savage's profile photoLaurent Therond's profile photo
6 comments
 
+Jonathan Savage I'll try to look it up for you...
Add a comment...

Jonathan Savage

Shared publicly  - 
 
The Hoka Odyssey is nearly identical to the justifiably best-selling Hoka Clifton. The Odyssey was created by Hoka for sale in larger stores, which protects the specialty running stores. So just how close is the Odyssey to the Clifton and Clifton 2? Here's my analysis and comparison - http://fellrnr.com/wiki/Hoka_Odyssey
1
Add a comment...

Jonathan Savage

Shared publicly  - 
 
Sorry for the lack of updates. I'm focusing on reading the lactate threshold research for my review of BSX and Moxy. I've read 60+ papers, and I feel like I've got a good sense of the scientific consensus (such as it is.) The testing is tricky, and I need to write some software for the Moxy to do more analysis.
6
Add a comment...

Jonathan Savage

Shared publicly  - 
 
I've added a value for "repeatability" to my GPS accuracy testing, which is a measure of how likely a watch is to give the same distance measurement for a specific course. I calculate the standard deviation for each segment of the course, and then take the average. I'm also testing the Ambit3 Run, which looks good, and retesting the Ambit2 R and TomTom Cardio Runner to see if they've improved with the latest firmware (they have). http://fellrnr.com/wiki/GPS_Accuracy
3
1
Ken Monaghan's profile photoFrancis Co's profile photoJonathan Savage's profile photoClaude Prinsloo's profile photo
8 comments
 
+Francis Co I just ordered one. I'll keep you posted.
Add a comment...
In his circles
140 people
Have him in circles
731 people
Justas Poderys's profile photo
Jeroen Jonk's profile photo
Miller Ann's profile photo
Aaron Olson's profile photo
Scott Chism's profile photo
Clay Mathis's profile photo
Kevin Transue's profile photo
Mike DeKoker's profile photo
John Pane's profile photo

Jonathan Savage

Shared publicly  - 
 
Testing update. I'm wrapping up my Ambit3 test, plus retesting the Ambit2 and TomTom and starting on the Leikr 1. (I need to do more testing on the 920XT & Epix with GLONASS enabled.) I'm working on my test of BSX Lactate Threshold/Moxy Muscle Oxygen sensors, which is proving hard work. I need to write up my test of UCAN drink, Newton Distance, Sketchers GORun Ultra 2, Saucony Endorphin. My testing of HRV software has become a little lost in confusion, as the research is complex and my results ambiguous. I may write up a comparison of compression shorts (Race Ready, Road Runner Sports, 2XU, Asics). Oh, and my thermal camera arrives today.
4
Andreas Radke's profile photoKen Ludt's profile photo
2 comments
 
So what are you writing g+ posts for? Get to work! Lol 😁 
Add a comment...

Jonathan Savage

Shared publicly  - 
 
I have a deep hankering to do a solo run of the West Highland Way. I so want to be out in those hills, running free. While the race would be cool, the crew requirements make it logistically more tricky, and a simple solo run would be much more relaxed. I might even take two days over it, as 50 miles/day would allow me to run relaxed and be in daylight the whole time.
3
Karthik Shanmugam's profile photoJonathan Savage's profile photo
2 comments
 
Mostly it's the cost, partly it's the vacation time,  and also the other things I want to do, but I think it's on the list to do soon.
Add a comment...

Jonathan Savage

Shared publicly  - 
 
I'm working on a SportTracks plugin for Moxy muscle oxygen sensor. Here's an early snapshot of data taken at the same time as doing a BSX lactate threshold test. (The BSX read a steady 88-89% saturation through the test, though there's no way of getting to the raw data from BSX. Next time I may record the iPhone screen.)
4
Add a comment...
 
Tempo Runs: are they good or bad? Well, coaches and science say radically different things.  http://fellrnr.com/wiki/Tempo_Runs (This is part of my review of BSX and Moxy, with a lot more to come)
8
Sean Fowler's profile photoJonathan Savage's profile photoGeorge Ilie's profile photo
5 comments
 
The tool is based on my journal from the period when I was training for performance and my father's journal, as a coach.
I checked the performance evolution and the interval workouts and I put together the monthly averages, intervals duration and breaks from the periods with the highest progress. Then I came up with a formula.
Also, it matches the theories that the optimal intensity workouts per week should be 15-25 percents of the mileage (see http://training4endurance.co.uk/improve-endurance/lactate-threshold-training/)

I did a 2 months test recently and the progress is real.
However, in the second month the progress was smaller than what I was expecting, mainly because I've tried to keep the schedule instead of adapting to the conditions - most of the time I've been training at 6:30 AM and the humidity was constantly above 90%.

The length of an interval and the total distance in a single workout are just perfect. At least for me.
Add a comment...

Jonathan Savage

Shared publicly  - 
 
This is why I’m retesting the TomTom watch to see if the latest firmware has improved the GPS accuracy. These tracks suggest that the GPS chip is doing a really good job, but the firmware is not using the data right.
1
Add a comment...
People
In his circles
140 people
Have him in circles
731 people
Justas Poderys's profile photo
Jeroen Jonk's profile photo
Miller Ann's profile photo
Aaron Olson's profile photo
Scott Chism's profile photo
Clay Mathis's profile photo
Kevin Transue's profile photo
Mike DeKoker's profile photo
John Pane's profile photo
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Previously
Charlotte, NC, USA - Bedford, England
Story
Introduction
Ultrarunner, software engineer, writer
Basic Information
Gender
Male
Jonathan Savage's +1's are the things they like, agree with, or want to recommend.
NOVA | Dogs Decoded
www.pbs.org

How smart are dogs, and what makes them such ideal companions?

ultraRUNNING Online - Calendar
www.ultrarunning.com

New Calendar |. Home > Calendar. Browse... New Calendar. Database Driven Event Calendar We have developed a brand new database driven cal

The Theory uses tiny MicroVision projector to concoct even tinier police...
www.engadget.com

Looking like the ghost of Hot Wheels fantasies past, a new video short has beamed out of the minds at The Theory --

Wanted pages - Running tips for everyone from beginners to racing marath...
fellrnr.com

From Running tips for everyone from beginners to racing marathons and ultramarathons. Share/Save/Bookmark. Jump to: navigation, search. Show

NASA - Ames Imaging Experts Create Unique Views of STS-134 Launch
www.nasa.gov

Imaging experts located at NASA's Ames Research Center captured and composited still images and video of the last launch of Endeavour.

VDOT Calculator with adjustments for temperature and body weight, plus F...
fellrnr.com

From Running tips for everyone from beginners to racing marathons and ultramarathons. Share/Save/Bookmark. Jump to: navigation, search. This