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.
Although the HIV risk factors are the same for everyone, some gender groups are far more affected than others. Gay, bisexual, and other men who have sex with men, for example, account for the majority of new HIV infections in the U.S. each year despite making up only 2% of the population.ho is at Risk for HIV? HIV can be transmitted through certain bodily fluids: blood, semen (cum), pre-seminal fluid (pre-cum), rectal fluids, vaginal fluids, and breast milk.