![]() ![]() Loading variations such as isometrics, free weights, and resistance bands require different firing patterns and levels of motor control.Barbells are great, but most human movement (walking, running, reaching, throwing, etc.) is open chain, so we need to train it! Open & Closed Chain movements around the affected joint are both important and should be included.It can be startling how many folks have poor motor control and joint position sense over some joints when asked to focus movement at only one joint. Motor Control Drills for individual joints (the replaced joint as well as supporting joints) take the targeted joint through full, active, pain-free range of motion.If we want our joint replacement fitness clients to get the most out of their replacement, we need to program a variety of aspects: Another way to think about the SAID Principle is “use it or lose it”. Our joint replacement clients likely got plenty of that during their physical therapy anyway. Training with precision means taking our fitness training beyond “strengthening and stretching”. Building variety into fitness training for joint replacement clients So, we will need to train with precision to maximize and improve proprioceptive input and joint position sense. The injuries to tissues or joints, whether acute or chronic, can result in dysfunctional proprioceptive feedback, and that is not automatically regained after joint replacement. Some studies have shown, depending on the type of replacement performed, joint capsule mechanoreceptors are no longer present and do not regenerate. Of specific concern for joint replacement clients are the mechanoreceptors that provide input to the brain about the joint and surrounding area through touch, pressure, stretch (skin and muscles/tendons), temperature, vibration, and movement. Joint replacements are an incredible medical innovation, but they are also incredibly traumatic events to the dermal, fascial, musculoskeletal, and nervous systems. The takeaway is this: if you want a certain result, you must train with precision. A more precise, neuro-centric definition would be “the body ALWAYS adapts to EXACTLY what it does”. ![]() ![]() The classic definition of this principle is “the body adapts to what it does”. Kevin is Level 1 Sports Performance Coach from USA Weightlifting and is also an ACSM Health Fitness Specialist.The SAID Principle, Specific Adaptation to Imposed Demand, is a fundamental law of human physiology. Need help with this? Please contact Kevin to schedule a free goal assessment. Proper application of the SAID principle can therefore lead to more effective training for your goals! Another example is doing cardiorespiratory or aerobic work will improve the efficiency of how the heart pumps blood and efficiency of how the cells use oxygen. For example lifting heavy weights will improve motor unit recruitment (how the brain uses muscle fibers) and stimulate muscle growth resulting in strength gains. So the type of stimulus applied during exercise will determine the physiological response and adaptation. According to National Strength and Conditioning Association the SAID Principle states “the demands placed on the body dictates the type of adaptation that will occur”. SAID stands for Specific Adaptations to Imposed Demands and works because all exercises involve both stimulus and response. Are you picking the right exercises for your goals? Are you performing them in the proper manner? Use the SAID Principle to make sure!
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