Final answer:
The three subcategories mentioned: passive, self-stretching, and isometric stretching, are all forms of static stretching. This type of stretching involves holding a muscle in a stretched position without movement, which is different from isotonic contractions where muscles change length while moving a load.
Step-by-step explanation:
Types of Muscle Contractions and Stretching
The question refers to three subcategories of stretching: passive, self-stretching, and isometric. These subcategories are all forms of static stretching. Static stretching involves holding a stretch in a fixed position, without movement, for a period of time. Passive stretching involves a partner who helps apply a slow and constant stretch to a muscle group. Self-stretching is performed by the individual alone, without assistance, and maintains slow and steady tension on the muscles. Lastly, isometric stretching involves applying a slow and constant stretch against a stationary object, which often includes activating muscle groups to resist against a force.
Contrastingly, isotonic contractions refer to muscle movement through a range of motion where the tension in the muscle stays consistent as the muscle either shortens (concentric contraction) or lengthens (eccentric contraction). Unlike static stretching, isotonic exercises are dynamic and can involve either lifting a load as in the case of concentric contractions, or controlling the lowering of a load during eccentric contractions.
The correct answer to the question "The following 3 subcategories make up what type of stretching: slow and constant stretch with partner (passive), slow and constant stretch without any assistance (self-stretching), and slow and constant stretch against a stationary object (isometric)?" would be c) Static stretching.