How much cycling fitness will I lose?

I went over on my knee on Wednesday whilst carrying a bag of cement at work. The result is a suspected tear of my meniscus in my right knee and the doctor has advised me to rest for at least 2-3 weeks although he said I can do some swimming. I didn't bother telling him that I can only swim about 25m max!!
The problem I have is that I am due to cycle the marmotte in 5 weeks time and have been training very hard for this event and am at the fittest I have ever been and was (I hope) on course for a decent time in this event. I was just about to embark on my final phase of training this week having built up my base over winter/early spring and been doing 2 *20's and hill repeats for the last month or so.
Now the question I have is this - if I follow doctors orders, which I will, and rest for the next two weeks and then start cycling again at a presumably much lower intensity than I do at the moment, how much fitness am I going to lose in this time? Will I retain the endurance that I have built up and maybe lose a bit of speed or should I just accept that given the timing of the injury I am unlikely to participate in this event? To be honest the way my knee feels at the moment, cycling again seems like a long way away.
Thanks
The problem I have is that I am due to cycle the marmotte in 5 weeks time and have been training very hard for this event and am at the fittest I have ever been and was (I hope) on course for a decent time in this event. I was just about to embark on my final phase of training this week having built up my base over winter/early spring and been doing 2 *20's and hill repeats for the last month or so.
Now the question I have is this - if I follow doctors orders, which I will, and rest for the next two weeks and then start cycling again at a presumably much lower intensity than I do at the moment, how much fitness am I going to lose in this time? Will I retain the endurance that I have built up and maybe lose a bit of speed or should I just accept that given the timing of the injury I am unlikely to participate in this event? To be honest the way my knee feels at the moment, cycling again seems like a long way away.
Thanks
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With a lesser injury and less time off you should be ok.
If, however you start riding again and it doesn't feel right, stop!
Also, don't expect to be at a similar level for a good few weeks..
Obsessed is just a word elephants use to describe the dedicated. http://markliversedge.blogspot.com
Admittedly I have not had 2-3 weeks totally off cycling, but cause of my knee I massively cut mileage and for 2 weeks only did my commuter, about 3 miles each way 3 times a week, after that I started doing rides again and my fitness had actually improved, I managed a 37 mile loop with a couple of short climbs in at 20mph average! Now I know averages are not important but it shown I actually improved as before I could not do that.
Obsessed is just a word elephants use to describe the dedicated. http://markliversedge.blogspot.com
I did incorporate "rest weeks" during the program but just cut out the high intensity workouts and cycled at approximately 55bpm below my Max Heart Rate during the recovery week.
I'd suspect you'd lose some top end speed, but provided you don't have any knee pain you should be OK.
Neil
"Because the cycling is pain. The cycling is soul crushing pain."
Since i've returned, this is what has happened:
Day 1 - Went 5 miles in 17 minutes. Can usually do them in 13/14 minutes. When sprinting, my lungs gave in waaaaaaay before my legs started burning.
Day 2 - Did 10 miles as the hardest pace I could. Can't remember the time but my breathing, again, was the main problem. Felt like a tank on any slight incline.
Day 3 - Did 20 miles in 1hr 10 mins. Pushed a massive gear to get the legs buring. Breathing a bit better. Got out of the saddle for the first time to sprint and it felt awful!
Day 4 - Did 20 miles in 1hr 6 mins. Breathing capabilites massively improved. Comfortably climbing/sprinting out of the saddle without trouble - legs burning hard though after 5/6 seconds.
Day 5 - Did 54 miles. Speedometer battery died 43 miles in so have no time but it killed me! Did about 700m of climbing. The climb was about 25% slower than usual. Descending was good though. Breathing is fine, although still difficult on hills, as my weight has increased.
Day 6 (Yesterday) - 10 miles in 24 minutes - sharing the work with another rider though. Another 10 miles done by myself in 33 minutes. Managed to hold 26mph for 4 minutes without a tailwind! Managed to equal my best time for a particular hill I go up often. (54 seconds).
(The above days were not consecutive - I had rest days in there too).
Today I feel great and it's only been just over a week before i've got back on the bike properly. It's been 36 days since I had a crash and was unable to ride.
I think the key is to go out and do a very high-intensity ride ASAP. Read this: http://www.bikeradar.com/fitness/articl ... good-20115
5 weeks seems to not be amibitious though, depends on the severity. Good Luck
Pom - my doctor said that if there is no improvement after the two weeks rest then I was to go back and see him. I will ask him about an MRI if I do.
After sitting in the garden all day yesterday (my pedometer on my phone which is always in my pocket registered only 926 steps) and doing a few ice packs, the inflammation has reduced a bit. More of the same today.