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.
Risk factors for cervical cancer include: 1  Many sexual partners. 2  The greater your number of sexual partners â and the greater your partner's number of sexual partners â the greater your chance of acquiring HPV. 3  Early sexual activity. 4  Having sex at an early age increases your risk of HPV.