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.
You can get infected from sexual contact with someone who is infected with HIV. Sexual contact that can transmit HIV includes: 1  vaginal sex (penis in the vagina). 2  anal sex (penis in the anus of either a man or a woman). 3  oral sex (penis in the mouth).