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.
3 FactoRS WHIcH contRIBute to unequal RISk FoR HIV/aIdS â¢ Young people living in communities with high HIV prevalence, which includes many African American communities, are more at risk for HIV even if risk behaviors are the same as young people living in a community with lower HIV prevalence.