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NASM CPT 7th Edition Chapter 14: Flexibility Training Concepts 1

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    Chapter Goals:

    • Be able to summarize the importance placed on flexibility training for you clients and the differing goals for health and fitness.
    • Discuss the scientific rationale for training flexibility.
    • Be able to utilize the right methods for effective stretching in your clients’ programs.
    • Be able to use, instruct, and cue the self-myofascial techniques, active stretching, and dynamic stretching using the right methods and protocols.

    Introduction to Flexibility Training

    What is Flexibility?

    This is defined as the normal ability to stretch the soft tissues allowing the complete range of motion of joints. 

    Flexibility plays a major role on mobility during the motions that are dynamic.

    The factors that play a role in flexibility are:

    • Genetics
    • Myofascial (connective) tissue elasticity
    • Composition of tendons or skin surrounding the joint
    • Joint structure
    • Strength of opposing muscle groups
    • Body composition
    • Sex
    • Age
    • Activity level
    • Previous injuries or existing medical issues
    • Repetitive movements

    The presence of poor levels of flexibility will lead to alteration occurring in patterns of movement and the human movement system as the body tries to go through motion with the least amount of effort and resistance.

    Human Movement System Review

    The human movement system may also be called the kinetic chain, and this is made up of the muscular, skeletal, and nervous systems. 

    It is important to recognize muscle imbalances that exist, as these imbalances lead to poor posture, which leads to improper movement, which then leads to injuries occurring. 

    Muscle Imbalances

    These are alterations in the lengths of the muscles around a joint, and some are overactive, while other may be underactive. With all distortion syndromes we see common areas of these imbalances occurring.

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    Altered reciprocal inhibition occurs naturally and allows for movement to happen. This is the simultaneous contraction of prime moving muscles and relaxation of the muscle that opposes the prime mover.

    Synergistic dominance is when the synergist muscles take over due to the agonistic muscle being weakened.

    Neuromuscular efficiency is defined as the ability for the nervous system to recruit the right muscles for force production, reduction of force, and stabilization of the body dynamically in the three planes of motion. This sometimes can be poor in people.

    Scientific Principles of Flexibility

     When the muscles lengthen, there are many reactions that happen in the muscle to be stretched. We know this as the lengthening reaction.

    The reaction goes in these stages:

    1. The muscle is lengthened, and the muscle spindle is activated

    2. The stretch reflex is activated, and the target muscle contracts

    3. The Golgi tendon organ senses the tension and then inhibits the muscle spindle, so the stretch reflex is overridden, and the muscle is relaxed

    Scientific Rationale for Flexibility Training

    We have two possible factors that support our need for flexibility training. These are pattern overload and the cumulative injury cycle. 

    Pattern Overload

    This is the consistent repeating of the same movement pattern for a long time and may lead to dysfunctions or injuries.

    Cumulative Injury Cycle

    This is a cycle where tissue trauma causes inflammation, which causes muscle spasms, which causes adhesion, which leads to alterations in neuromuscular control, and that leads to muscle imbalances, and the cycles continues until something intervenes.

    Self-Myofascial Techniques

    Self-myofascial techniques are quite abundant. The most popular form is self-myofascial rolling with foam rollers and massage balls.

    The myofascial rolling focuses on the nervous system and fascial system, and this produces mechanical responses and neurophysiological responses that will influence relaxation in tissues and pain in the tissues surrounding through the activation of sensory pathways.

    With self-myofascial rolling, we put some small force to an adhesion, usually referred to as a knot, and we keep the force on these knots until they release.

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    The mechanism here is autogenic inhibition. Usually, we do this form of stretching for 1 – 3 sets and hold it on the tender area for 30 seconds.

    Static Stretching

    This is the process of taking the muscle through a passive point of tension and then holding that stretch for 30 seconds at a time for 1 – 3 sets.

    This is the most well-known and traditional form of stretching.

    Static stretching will often affect the sensory mechanisms in the nervous system and allow for a greater tolerance of stretching. Over time, this enables us to stretch the muscle longer. 

    Static stretching is ideally used for decreasing the activity of muscle spindles in the overactive muscles prior to and after activity.

    Active Stretching

    This is the process of using the agonist and synergist muscles to move dynamically in the joint in a range of motion.

    The stretching style is known to increase the excitability of the motor neurons and create reciprocal inhibition for the stretched muscle.

    The mechanism of action for this stretch is reciprocal inhibition. We usually stretch for 1 – 3 sets and hold them for 1 – 2 seconds and 5 – 10 reps per set.

    Dynamic Stretching and Controversial Stretches

    This uses the force production of muscles and the momentum of the body to take the joints through a full range of motion. 

    Here we are using reciprocal inhibition to improve the extensibility of soft tissues. 

    The training variables usually have us doing 1 set for 10 – 15 reps, and then 3 – 10 different exercises.

    Controversial Stretches

    Performing certain stretching styles may increase the risk for injury. With proper teaching, they can be very safe and help with posture. But we do have some that are considered to be controversial and possibly dangerous for the user. 

    NASM CPT 7th Edition Chapter 14: Flexibility Training Concepts 2
    NASM CPT 7th Edition Chapter 14: Flexibility Training Concepts 3
    NASM CPT 7th Edition Chapter 14: Flexibility Training Concepts 4

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