BPM training - by bikeradar.com

                Zone 6 (94-100% of MHR): For high-intensity interval training to increase maximum power and speed         

                Zone 5 (89-94% of MHR): For raising anaerobic threshold. Good sessions for 10- and 25-mile time-trials.          

148 a 161 Zone 4 (82-89% of MHR): For simulating pace when tapering for a race.         

136 a 148 Zone 3 (75-82% of MHR): For development of aerobic capacity and endurance with moderate volume at very controlled intensity.         

118 a 136 Zone 2 (65-75% of MHR): The basic base training zone. Longish rides of medium stress.         

109 a 118 Zone 1 (60-65% of maximum heart rate): For long, easy rides, to improve the combustion and storage of fats.         

          

Go Slower, Get Faster:   Key session: 3hrs in Zone 2. Stay in the zone and stick to it. Don’t be tempted to push on the hills.       

Burn Fat, Save Time:   Key session: 5min warm-up and then 4-6 30sec sprints with 4-5min rest. (6-8 weeks)       

Became an endurance monster:   Key session: 3-4hrs in Zone 2 with 10min burst of Zone 3-4 every hour.       

http://www.bikeradar.com/fitness/article/training-heart-rate-monitor-basics-28838/