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.
1 Your risk of getting HIV or other STDs is reduced if you do not have open sores or cuts in your mouth. 2  You can reduce your risk of getting HIV and other STDs through oral sex if you avoid having your partner ejaculate (cum) in your mouth, and if you use a condom.3  For more, see CDCâs Oral Sex and HIV Risk. Your risk of HIV infection increases if you or your partner also has an STD. 2  You can lower your risk of getting HIV and other STDs by always using a new condom. 3  Oral or hormonal contraceptives (e.g., birth control pills) do not protect women against HIV or other STDs.