This is the dramatic moment a brave cyclist chased down three thieves who had just stolen another rider 's bike . Alex Sweeting , 25 , was riding along the road in Leyton , east London , when he saw a 53-year-old man in cycling gear who had just been shoulder barged off his bike . Mr Sweeting 's head camera shows him pedalling madly after the three men at 21mph - as the heart rate monitor he was also wearing reached 164 beats per minute . Scroll down for video . This is the dramatic moment brave cyclist Alex Sweeting chased down three thieves who had just stolen another rider 's bike , as the heart rate monitor he was wearing showed his pulse was beating at 164bpm . Keen cyclist Mr Sweeting ( pictured ) , 25 , pedalled after the thieves and managed to retrieve the stolen bike . As he shouted at the men , they dropped the bike and sprinted away . Mr Sweeting , a technical production manager at Teradata , told MailOnline : 'It was 10.30pm at night and I had been at work and then at my cycling club ( Lea Valley Cycling Club ) social at a pub that we have once a month . ' I was cycling home with a mate when we went our separate ways . I was riding home to Barking and I was going quite quickly . ' I then saw a guy running along in cycling shoes , which I thought was a bit odd . 'He flagged me and a bus down and said what had happened and that someone had nicked his bike and I then saw them running off in the distance . ' The helmet mounted camera belonging to rider Alex Sweeting , 25 , shows the 53-year-old man in cycling gear running along the cycling lane after three thieves pushed him to the ground and stole his bike . With his helmet-mounted camera and heart monitor on , Mr Sweeting raced after the three thieves in Leyton . He added : ' I was n't thinking much at the time . I just thought `` how can I get near them '' ? 'It was only when I stopped that I realised what I 'd done . 'The cyclist then caught back up with me and he was already on the phone to the police . He was obviously really annoyed about what happened , but was glad he got his bike back . He said the bike only cost about £200 . 'He was very grateful but said it was n't the first time it has happened to him in the same area . ' Mr Sweeting , a passionate cyclist who travels by bike to work every day , added : 'It angers me that people do this . It could have happened to anyone . You should be able to feel safe on a bike wherever you go , but this was a vicious attack . Pedalling at a top speed of 21mph and with his heart rate at 164 bpm , Mr Sweeting caught up with the thugs . As his speeds ticks over 20mph , Mr Sweeting frantically pedals after the three thieves in the distance . ' I actually got the helmet camera for Christmas because of an incident with a car , so I 'm really glad I got it . Hopefully it 'll lead to some sort of prosecution or charge . ' A police spokesman said the victim - who was making his way towards Wanis Distribution Centre in Orient Way , Leyton - was slightly injured but declined medical attention . Police described how one of the men suddenly charged at the cyclist , causing him to fall off his bike into the road . Another man then punched the victim in the back of the head before a third grabbed the bike and all three ran off . The three men were described as being between 18 and 25 and about 5ft 8ins tall . Two were described as black , while the other appeared to be Asian . Mr Sweeting caught up with the three men on his bike and they dropped the stolen bike before running off . The three thieves discarded the stolen bike as Mr Sweeting caught up with them and then fled on foot . As Mr Sweeting retrieved the stolen bicycle , the three men continued to run away along the track in Leyton . Officers searched the area but the men had escaped . Last month , Alan Cartwright , 15 , died after he was stabbed while riding his bike in Islington , North London . The two friends he was with had their bikes stolen during the attack . Anyone with information about this incident is asked to contact Waltham Forest police on 101 or call Crimestoppers , anonymously , on 0800 555 111 - please quote crime reference number : 4905428/15 .
Three thugs pushed a man , 25 , from his bike , punched him and stole it . Man was spotted by rider Alex Sweeting , 53 , who raced after the three men . He captured the crime on his helmet-mounted camera and heart monitor . Raced after them at 21mph and his heart rate reached 164 beats per minute . They dropped the bike after he chased them along road in Leyton , London .