I try to start off gently and allow some time to warm up - this is not always possible as a typical ride starts into the wind and up a fairly steep hill. I've had manflu (poor me) for two and a bit weeks so I've been walking up the hill to make life a little easier. My 5 mile issues predates my flu but is noticeably worse.
Varies from day to day but I have noticed that having a substantial meal before a ride often leads to me feeling pretty unwell.
I'll try putting more effort into warming up and see if that helps. :-)
i think that's your main problem. First the wind and steep hill when you're not warmed up. I too take a good 10 or 15 minutes to settle into a ride (except when i'm morning commuting for some strange reason???). When out with friends especially, i struggle for the first few miles and i think you're heart just needs to get into a rythym.
And there's the other bit of your problem. Your man flu may have taken it out on your heart. Flu is not a cold and can have quite an impact on the body. But a serious cold (man flu) can have an impact too.
I once had [what i thought was] a head cold for 3 weeks and couldn't shift it. I heard you're not supposed to train with a cold but after 3 weeks i got bored of driving to work so decided to cycle the 17 miles, as the cold didn't seem that bad. Got to work feeling fine, got in the shower and after about 30 seconds started to feel really ill. got out the shower and got dressed and felt absolutely dreadful, it was such an effort to pull my clothes on, like they weighed 10 tonne or like gravity was really bad. Ending up phoning my mate at her desk to come and get me. It took her 20 mins to walk me up the stairs (50 yards away) because i had to keep stopping for a rest. It was like my legs weighed a tonne. She plonked me in the canteen and went to go and get my boss, by which time i was almost on the floor. I wasn't faint, i just couldn't stand up and felt really sick with effort everytime i tried. i was adamant they shouldn't call me an ambulance (i admit I did look like shoot by this time!) so they got me a taxi home and i spent 3 days in bed.
My dad took me to the doctor on 3rd day and he told me that i actually had a severe chest infection. He nearly fell off his chair when i told him how far i cycled. He said he was amazed that i was even able to cycle 17 miles without keeling off the bike because even by just sitting i was only taking in half the oxygen i needed, a bit like breathing through a straw. He told me that my body had used all it's oxygen stores and so had basically re-routed all remaining oxygen to my heart, lungs, brain and other organs, there was nothing left in my limbs/muscles and that's why i couldn't stand up.
He said, as my heart was muscle, i was lucky i hadn't permanently damaged it.
i went to work on the 4th day feeling a bit better, but got sent home within 2 hours because i went weak again. Spent a whole week off work in the end and felt shoot for another week after. My brother, who is a nurse, backed up what the doctor said and told me i was prat, but also made the observation that the body was an amazing mechanism that will take drastic action against itself in order to survive. Hmmm you don't say!
So if i were you, i would take it easy when you've just recovered from man flu. I've never ridden when i've had a cold again (well, not 17 miles anyway
).