davidtinker

Interesting question! Never considered impact of altitude on FTP. If your JHB rides are all indoor and your CTN rides outdoor you could change the "Indoor FTP" setting in /settings to cater for JHB. Otherwise is quite hard to handle this "automatically" in a tool. Presumably once you have been in JHB for a few days you will acclimatise and return to your sea-level FTP?

One more thing. The HR spike detector is kicking in and fixing spikes above your max HR on some of your rides. So either your max HR is higher than what you have configured or your HR strap is acting up? You can change your max HR in /settings.

Also I think your FTP is set way too low. That ride on the 28th has you at 98% intensity for almost an hour but the HR trace doesn't look like you were doing a 1h full gas TT.

The "time in zones" HR load estimation model isn't working for you. I think its way over estimating training load. Your ride on the 29th has 139 load for 46m of work. Thats too high since 1h at FTP is supposed to be 100. I suggest changing to the "Average HR" model in /settings. It will take a few minutes to recalculate all of your activities. Let me know how that works out.

Outliers are now removed from the models used to estimate training load for activities with only heart rate data. This makes the models a lot more accurate for most people. That said I wouldn't expect such a big change. Could you please msg me a link to one of your activities so I can find you in the db and have a look. There is more info on the end of this thread: https://forum.intervals.icu/t/how-training-load-estimation-from-hr-works/280

You can now change the factors used to compute fatigue (ATL) and fitness (CTL). On the fitness page choose “Options” and then “Adjust Fitness Days”. Use the sliders to adjust and the chart will redraw. You can choose to apply the new factors to all activities or only from the oldest date shown on the chart.

Intervals.icu now supports resetting your estimated FTP value. Useful if you are coming off a long break and the normal decay isn't enough. "FTP up!" achievements for all! Add "Set eFTP" entry to your calendar.

Sure. Please msg me your Strava ID or Intervals.icu email address. If you set a Swim FTP it only applies to new activities. You can use the "Edit" button on the calendar page to apply it to older activities. Just clear out the other fields.

The activity heart rate page has 2 new charts. The first shows HR duration curves i.e. how long have you managed to sustain a given heart rate for with lines for the activity, last 42 days and seasons. The second chart shows total time accumulated at or above the indicated heart rate during the activity. Handy for checking that those VO2 max intervals are hitting the spot!

Heartrate spikes are now detected and fixed by comparing the HR trace to your max HR. Spikes above max HR are replaced with a line interpolated between the HR values before and after the spike. If the HR data for an activity is very poor you can ignore the HR trace by clicking the cog icon. You can see the unmodified HR trace by clicking the charts button and adding Raw HR.

Good idea, it doesn't exist yet. I have added it to the todo list.

Thanks! Intervals.icu doesn't use estimated power data from Strava, they don't give that out via their API and in my experience it is not very reliable anyway. For activities with HR and no power the "time in heart rate zones" is used. The weekly summary info combines the time in the HR and power zones. So if you spend 30m in Z4 power on the trainer and then another 10m outdoor in Z4 heart rate it will be 40m Z4 in total for the week. This falls down a bit if you are doing short high intensity intervals as your HR doesn't respond quickly enough. But those are best done with power anyway.

Intervals.icu will now show how closely you are following your training plan on activities and in the weekly summary popup. If you are not following a plan you can turn this off in “Options”.

The activity detail pages now show HRR (heart rate recovery) and the fitness stats. HRR measures how quickly you recover after a hard effort. It is the largest drop in HR over 60 seconds starting from a HR of at least Z5 (threshold). It is shown in the heartrate trace on the chart. Recovery sections in activities with power are ignored if the average power is more than 1/3 of FTP or 5s power is more than 1/2 of FTP. So it is best to freewheel. The general idea is that, the faster or greater your drop in heart rate, the better your recovery - www.pezcyclingnews.com

You can now filter the /power page and the activity power page to show indoor and/or outdoor power curves and rankings.

The decoupling charts now have warmup and cool down. The default warmup is 20 minutes and cool down 10 minutes. You can use the slider to adjust these numbers. The power / HR ratio chart is now the primary one for decoupling.

Unfortunately Strava doesn't return that information through their API. I have started the process to integrate with Garmin Connect but do that is some way off as it will be quite a lot of work.

Intervals.icu now supports capturing indoor FTP for indoor trainer and virtual rides. If no indoor FTP is set then the normal FTP setting is used. Also I have added donate buttons for Paypal and Patreon for running costs. Supporter feature requests move up the todo list!

Intervals.icu now has forums! https://forum.intervals.icu/ "This is a place to discuss all things related to Intervals.icu. Have an idea for a new feature? Something not working as you would expect? Post it here!" I still need to hook them into the app properly but single sign-on should be working. I will still post notices of new features and so on here and on Twitter etc.. Nothing quite like bikehub! But quite a few people have commented on "not being able to find any forums" so I thought I should cure that.

I found this on EPOC: https://assets.firstbeat.com/firstbeat/uploads/2015/10/white_paper_epoc.pdf

Thats an interesting question. I only found out about EPOC recently in the context of alternatives to TSS that more accurately represent training load. Its quite possible that it doesn't correlate at all. I can't see EPOC anywhere on Garmin Connect for my rides? Where do you get to see it?

Its supposed to take into account the conditions, strength of the field, how hard the race was etc based on the participants previous CTCT or something. So that race was "easy" (no big hills, not too much wind) but also hard (almost 42km/h is quicker than normal).

0.72

The seedings have been updated. Virtual winners time not adjusted too severely so If you were still with AB at the end of last weeks race you are now in A. Which is good because I have gone and got sick and might not make Sunday.

I have just added work (kJ), real avg power (zeros included), variability index and efficiency factor to intervals. For older activities you need to "Reset" the activity or make a small edit to one of the intervals to get the new stats.