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.
What Increases Your Risk. Most people get HIV by having unprotected sex with someone who has HIV. Another common way of getting the virus is by sharing needles with someone who is infected with HIV when injecting drugs. You have an increased risk of becoming infected with HIV through sexual contact if you: 1  Have unprotected sex (do not use condoms). 2  Have multiple sex partners. 3  Are a man who has sex with other men.  Have high-risk partner(s) (partner has multiple sex partners, is a man who has sex with other men, or injects drugs).
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.