1 Isotonic -a muscle fiber contraction in which force production is unchanged when the muscle contracts causing movement of an external load.  Isokinetic -a muscle fiber contraction in which force production of the contraction is sufficient to overcome the external load.
HIV/AIDS. HIV Risk Behaviors. The risk of getting HIV varies widely depending on the type of exposure or behavior (such as sharing needles or having sex without a condom). Some exposures to HIV carry a much higher risk of transmission than other exposures.
If you already have HIV, and then get another STD, it can put your HIV-negative partners at greater risk of getting HIV from you. Your sex partners are less likely to get HIV from you if you. Use antiretroviral therapy (ART). ART reduces the amount of virus (viral load) in your blood and body fluids.