For the last few weeks I have felt like my legs and my heart/lungs are not in sync.
Background: I live in Ohio and usually take a break of about 3-3.5 months off the bike after september each year (I know it is best to ride all year and will probably do that from now on). I have been riding a road bike seriously for four years now and this will be my second season racing. I did 4 races for fun and experience last summer. I am 28 yrs old, almost 6'3" and currently about 202 lbs. My body fat is probably in the neighborhood of 10% (I'm planning to shave off 5-10 lbs).
I made a decision to train and race seriously this year. I ended my break and began riding on January 17th. I started riding 5 days/wk, 35 - 45 min/day on my trainer and/or rollers between then and about 5 weeks ago for some base mileage (2 months of base). About five weeks ago I started doing intervals twice a week and a 35 min LT session once a week. I was still riding inside on my 5 days/wk, 35-45 min schedule (with intervals and LT) until a couple weeks ago when the weather finally broke and I could take some longer rides outside (still 5 days/wk and still mixing in intervals).
Problem: I have been feeling good on my bike and do my intervals hard but during the last few weeks I noticed that I can't seem to get my heart rate up to my MHR before I feel spent. I did my first race of the year last saturday and wore my Heart Rate Monitor. My max heart rate during the race was only about 92% of MHR despite the fact that I thought I gave maximum effort a couple times. I have also recently noticed that during intervals I am burnt before my MHR is achieved. What gives? I feel like I am in decent shape. I am positive I am NOT overtrained and I don't feel lethargic or sick or out of shape on a bike or otherwise except when I try to give my max effort. Hell, I raced saturday and then rode 65 miles Sunday and felt OK this week. My resting HR is in the 30s! I seem to be fit except that I burn out on my 'all-out' efforts when my HR hits the high 170s. Are my leg muscles lagging behind my Cardiovascular fitness? Have I not done enough base? Should I continue to do intervals? Any advice is appreciated.