High levels of Test or any AAS over a pro longed period change the actual make up of your tendons, they lose their elasticity, it has been proven in a study somewhere where doses over 200mgs per week have a negative impact on tendons. A long cycle on no more than 200mg of deca weekly and if you can afford it a few ius of genuine hgh daily will help rehabilitate tendons, i have used this form of rehabilitation myself and found it has worked and the instance of me getting recurring tendon type injuries has stopped, i did however stay on the above for 6 months straight and have not ventured over the 200mg mark of test a week since i stopped, as i only use HRT these days as I'm not competitive anymore, recreational drugs dehydrate you, which will make you more prone to injury, if you use them make sure to rehydrate before training heavy again, training heavy whilst dehydrated is just asking for trouble.