Even though you don’t feel well, your form is probably exactly where the PMC says it is. If, hypothetically, your illness were to magically go away in an instant, and you jumped on your bike and did a race, you’d probably have a really great race. But like Chad McNeese said, don’t get too consumed by Training Peaks PMC. It’s simply tracking fitness stress. There isn’t really a quantifiable method to measure work stress, family stress, financial stress, illness, or injury. I’ve been dealing with knee tendinitis since February, and I know it’s impacted my training. But that doesn’t show up at all in the PMC.
On a side note, if you’re really interested in tracking stress, sleep, etc, then I recommend you check out a company called Whoop (www.whoop.com). They make a fitness tracker strap that tracks your daily strain (not just from exercising), your sleep quality each night, and generates a recovery score from 0-100%. I’ve read numerous reviews and some people said that they were able to tell that they were getting sick a couple of days before they were symptomatic because they had a great night’s sleep but their recovery score went down. It’s a subscription based service of $30 a month, and you have to pay for the first 6 months up front (about $180). I’m considering giving it a shot soon. I know I don’t sleep as well as I should and with three young kids and a full-time job, there are probably certain days that I should skip training instead of struggling through a workout.