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 and your partners are not infected with HIV, there is no risk. An âundetectable viral loadâ (see Fact Sheet 125) does NOT mean âno HIV infection.â If there is no contact with blood or sexual fluids, there is no risk. HIV needs to get into the body for infection to occur. Safer sex guidelines are ways to reduce the risk of spreading HIV during sexual activity.