January 2000
Issue #6
Innervation Training Article II
By Scott Abel
The more I attempt to initiate people to the main tenets of Innervation Training, the more I am forced to backtrack. Most hardcore training enthusiasts are so inundated with pseudo-scientific one-dimensional dogma, that a presentation of real science boggles their minds. Moreover, because Innervation Training as a theoretical paradigm encapsulates other core tenets of training science (e.g. Biochemical, biomechanical, kinesthetics, physiological, musculoskeletal, and of course neurological) it is often difficult to explicate in detailed written form without confusion the reader. Innervation Training as a theoretical modality is the first attempt to unify the best of inductive and deductive reasoning and empirical evidence present in the world of strength. Most “traditionalists” trying to understand Innervation Training often make the mistake of trying to reduce the whole theory to a program, or an idea. The average mentality of strength training enthusiasts is reductionism in nature. That is, they attempt to reduce all concepts, ideas, variables, and causations to a single form. As with most real theories in the material world, such reasoning is not plausible. The whole theoretically is greater than the sum of its parts. The Gestalt nature of Innervation Training theory is that it is very complex; understanding any aspects of its application necessitates a realistic understanding of its core theoretical tenets.
Before delving further into applied Innervation Training, I will again explain the main elements of Innervation Training Theory. Specifically in this article I wish to address the neurological adaptations to training. In order to discuss training in any detail it is imperative to define two variables. Strength and intensity. These are two words used everyday in the world of sport yet few people, even so-called experts spend any time analyzing their meaning. Strength for all intents and purposes is defined as force output capacity-: whether it is applied or not. Physiologically, there are over twenty different kinds of strength (applied) but all can be “reduced” to the idea of force output capacity for purposes of discussion. Strength contrary to “traditional” and hence “popular” belief is not that important a concept in terms of adaptations to training or training progress. More important to training progress and specifically to Innervation Training is the concept of intensity. Ask any “expert” to define intensity and you will certainly get a rambling of some sort, probably, co-relating strength with intensity. That is known as circular logic. Like the concept of strength, the concept of intensity must be defined in order to yield quantifiable conclusions and realistic discussion.
Ask any athlete about their training intensity and without hesitation they will tell you “I train hard. I train intense.” In fact I’ve never had a single athlete tell me “you know what, I really don’t’ train that hard.” But on what are they basing this supposition “I train hard.” This is merely a subjective interpretation of external feedback, which bears little meaning in actuality. Intensity isn’t a concept you report. It has no emotional connotations. Intensity as a process can be defined as an adaptive one, a learned response to stimuli, which is neurological in nature. Conceptually then intensity is based on the capacity of the nervous system to adapt specifically to specific forms of stress. For anaerobically trained athletes this idea is intimately connected to the concept of strength. Strength being defined as force output capacity and not 1RM. 1RM and physical definitions of strength are kindergarten conceptions at best.
Now, I can across the board guarantee that all of you are not training at maximum intensity. The funny thing about this is that most people who hear or read this comment by me are often offended. Why? This is not a character flaw. It is a physiological fact. If intensity is a learned process, much like reading and writing, how could you be training at maximum intensity- if not one has taught you? A subjective interpretation of your own workout ethic does not equal the definition of intensity; it only equals your opinion of your work ethic.
Workout intensity is an adaptive process learned by the nervous system. Before I can explain key elements of Innervation Training like “Functional Differentiation” and “segmented utilization” of muscles in action, I will use the remainder of this article to discuss intensity and the neurological adaptations to training which produce greater intensity and therefore, stronger better athletes.
By now everyone will acknowledge that the nervous system optimizes control of muscles involved in exercise (Komi 1992, Sales 1992, Lamb 1984, Behn 1995). If this is true than it follows that the nervous system is responsible for the intensity produced in a given activity. Basmajian (1977) believes that a mosaic of spinal motorneurons is dedicated to the learned response of a specific posture or movement of a joint through space. If this is true then it has tremendous implications for resistance training athletes seeking to maximize performance, either in increased strength or greater hypertrophy. Basmajian’s claims can be expounded upon to understand both systemic and body part specific adaptations to resistance training that are not musculoskeletal in nature. Romeny et al 1982 showed that the distribution of motor units activated within the muscle was related to the nature of the task performed. For the uninitiated reader a motor unit is composed of a nerve cell, a motor neuron and the muscle fibers, which it innervates. Not only is the distribution of motor units within a muscle important for their selected activity; but for an agonist muscle to produce its greatest possible force, all of the motor units in the muscle must be activated. (Paton and Brown 1995, Nardone 1989, Behn 1991, Sale 1982, 1987) To understand maximum fiber recruitment, understand that each motor unit contains a few to several hundred thousand muscle fibers. Muscles contain a few hundred thousand muscle fibers; thus each muscle is comprised of a few to several hundred motor units. Achieving maximum fiber recruitment, or what I call maximum voluntary neural activation, is an adaptive process of the nervous system to training stimuli. Compound this with the fact that there may be as many subunits of a muscle as there are motor units (Paton and Brown 1995) and soon you get the notion that there is exactness to the way the nervous system adapts to training stimuli. Therefore, it makes sense that there should be exactness to; training programs in order to capitalize on these adaptations and be able to improve in a linear progressive sense. As far as neural adaptations to training goes, increased activation of agonists could take the form of recruitment of high threshold units not previously recruitable or increased firing rates of units, both of which are adaptive processes. It seems larger muscles may generally rely more on recruitment for increases in force output. (Binder et al 1978, Hannery 1974, Behn 1995). Any increases in firing frequency (a.k.a. rate coding) with resistance training would not seem to contribute to increase force output, but rather improved rate of force output. (Miller et al 1981, Behm 1995). Both of the above points have a profound influence on resistance training, especially in relation to training for hypertrophy. Behn 1995 observed that "trained subjects could more effectively activate their quadriceps immediately after an exhaustive submaximal fatigue protocol�?�. This may suggest a stronger neural drive following fatigue in trained individuals, (1995 pp265) this is yet another adaptation to training which is neurologically based and which obviously influence performances. Capitalizing on the adaptations of the nervous system to training, by pre-programming specific training regimens to induce changes which result in greater workload capacity would obviously be of benefit to any athlete who wishes to maximize performance by teaching his body how to handle greater workloads, and how to receive greater benefits from the workloads he is handling. These are the most core principles of Innervation Training Methodology.
So far, we have determined the nervous system’s control of muscles in action, in a general sense. More specifically I have demonstrated that strength and strength performance is determined not only by the size of involved muscles, but also by the ability of the nervous system to appropriately activate the muscles. Furthermore, I am suggesting that the “size contribution” of involved muscles is also a result of previous neurological adaptation of muscles to specific forms of stress. These broad-based descriptions of neurologically based adaptations to resistance training are just the tip of the iceberg. Now we can look more closely at Neurological Adaptations to Training and mechanisms of neural adaptation which will illustrate further that intensity is a learned process, the result of which is greater workload capacity, and less importantly greater strength. Research shows that although most individuals can fully activate their prime movers (Behn 1995, Komi 1975; 1992, Sale 1987), synergistic muscle activity helps promote greater force output for trained individuals. “The activation and/or co-ordination of synergistic muscles may be less than optimal in untrained individuals (Behn 1995; pp265)”.
A further look at the research exemplifies the fact that strength gains associated with neural adaptations include altering recruitment, rate coding or firing frequency (which I’ve already noted), synchronization of motor units, reflex potential, co-contraction of antagonists, and synergistic muscle activity. (Komi 1992) This is also known as total activation; or total activation potential. While not every above variable is crucial to those in the iron-game, most of these neural adaptations play a key role in an individual’s progress, or lack of progress in training. A program designed to elicit these results right down to the technique employed during a repetition and during a set, is a program of high intensity. By now, the reader should begin to understand that intense training is more than just an interpretation of effort expended. It should be effort expended in a certain performance parameter, in order to force a specific adaptation to produce a certain performance result, in order to enhance performance: whether this means bigger muscles, lifting more weight, jumping higher, training longer etc, etc.
The mechanisms of neural adaptations to training can be summarized and presented in four different headings. The four mechanisms together approximate a working definition of Intensity applied. 1) Increased activation of agonists. That is, the ability to achieve maximum fiber recruitment, especially of the largest threshold motor neurons, as well as increasing firing rates. 2) Selective recruitment of motor units within agonists. This point especially reflects the need for proper exercise selection and technique in exercise performance. I will expound upon this further when I discuss “Functional Differentiation”, and the concept of “segmented utilization” in a future article. Selective recruitment also entails the idea of a “rotation of motor units” recruited during maximal voluntary contractions (Komi 1992, Sale 1982, 1983, 1987) That is, motor units may act kind of like rows of soldiers going into battle, suggesting an orderly aspect of neuronal response to training. Of importance here is that rotation only tends to occur within units of similar thresholds (following the main tenets of Hemmeman’s size principle of fiber recruitment, 1965). If this is true (and it is) then proper exercise selection and technique become even more important since exercising in a plane or range of motion outside of the muscle you intend to target, will recruit fibers from other muscles in that plane and range of motion which may share the same excitation threshold. I will discuss proper exercise selection and technique in later articles where I can address applied Innervation Training Techniques. 3) Selective activation of agonists within a muscle group further reinforces the necessity of precise movement pattern specificity and proper sequencing of exercises when developing programs. A person with short limbs and an average torso for instance would be well suited to do bench press as a good pec structural exercise or power movement. However, someone with longer limbs would not be well-suited at all for bench press since the range of motion in that specific plane of motion would almost certainly guarantee that the anterior delts would become the agonist with the most fiber recruitment activity. Maybe by now you can begin to see how complex training strategy should be if you are a true athlete seeking maximum performance and maximum gains. The fourth mechanism of neural adaptations to training is known as P.M.S. No it’s not a female thing. P.M.S. is the analogue meaning Pre-Movement Silence. As Behm states; “Agonist muscles during a ballistic contraction exhibit little or no motor unit activity prior to the contraction. This brief pre-movement silent period may bring all motor neurons into a nonrefractory state, allowing them to be more readily recruited at the maximum possible firing rates-P.M.S. may be a learned rather than an automatic response to ballistic tasks; perhaps an increased frequency of it reflects a neural adaptation to high-velocity training. This common nonrefractory period with ballistic contractions may contribute to the increased incidence on synchronization found with training. P270” see also Mortimer et al 1987.
For athletes like weightlifters, throwers, jumpers, and powerlifters, the pre-movement silent period would be a quantifiable adaptation to training affecting performance. This brief look at the way the nervous system responds to training stress illustrate many levels that would affect training strategy to produce results. It should be obvious now that different training “programs” may or may not suit certain athletes or weight trainers depending upon how far along their nervous systems are in the adaptation process. High volume high set training and low volume “heavy duty” training are all parts of a greater whole. It takes an expert to address specific training protocol and exercise selection for each individual person. “Experts” who go along ranting that their “system” is the right one (for everyone), obviously don’t understand the first thing about intensity, especially as an adaptive process. They also don’t understand that the “individual” is the actual determinant of the right program and the right strategy based upon their activity and workload capacity, as well as their own body’s anatomical arrangement. Once again be wary of the “gurus” and their one-dimensional approach to training, supplementing etc. This brief look at the concept of strength and intensity reflected by the adaptive process of the nervous system, is also a one-dimensional treatise about neuromuscular adaptations to resistance training. When I address facts from the field of Kinesiology, and biomechanics of resistance exercise, the picture gets more complicated, but more exact. When I combine the neurological research with proper biomechanics of exercise, as well as, an understanding of levers, prime movers, synergists, and excitation thresholds of muscles in action, then Innervation Training Theory, and how to apply it is complete. The research in this area that vindicates a great deal of traditional bodybuilding training styles is known as “Functional Differentiation” of muscles in action. Functional Differentiation and “segmented utilization” are the topics for my next article. After addressing these two topics I will finally be able to illustrate sample training programs and their application. Then you will all know “Innervation Training” as the only true training system in the resistance training industry. I will show first hand how a client like Troy Thompson put on 50 lbs. in two years of structural training. That’s not a gimmick it’s a fact.
Stay tuned and stay hungry!!!