Great questions, thoughts and observations, thanks. Just as a clarification, I am not against strength training, I think it is an absolute must for any athlete for a number of reasons. I am against “bulking up” just for the hell of it, without thought to a program that takes into account more than just the goal of hypertrophy. That alone is not advantageous to an athlete.
To you specific questions;
bodybuilding programs typically entail slow speed of muscle contractions... in what sense?? Are you saying that increasing muscle mass leads to the decrease in the speed of muscle neural motor unit activation?? What evidence would there be for this decrease? And if there isn't any, what do those the statements I've quoted mean?
“Bodybuilders” number one concern is with hypertrophy, or an increase in muscle size. Body building programs typically entail a rep range of 6- 12 most often to exhaustion. They often focus on isolation, to insure symmetrical and aesthetic development of each individual muscle.
The body, when active in sports, rarely works in isolation, and should be trained as a complete unit whenever possible. As far as speed of muscle contraction – athletic movements (especially martial arts) are explosive. The “slow speed of contraction in bodybuilding has limited positive transfer to sports.” Most athletic movements fall between 100 to 180 milliseconds – they are performed quickly. Leg extensions, bicep curls etc, fall within the 600 to 800 millisecond range. This is a noticeable difference in contraction time and ultimately in motor unit and fiber type recruitment.
Again, most bodybuilding programs focus on the aesthetic development of each muscle. Sports focus on a specific ability, and should specify the most dominant ability (ie, the one that a sport requires in higher demand.) Maybe that dominant ability is power, or the ability to perform an explosive movement the shortest amount of time possible. This biomotor ability is a function of maximum strength, and speed strength. Neither of these are trained using a rep range of 6-12 with a 600 millisecond muscle contraction. That is specifically designed for hypertrophy. While more muscle mass may not slow a fellow down, unless it was trained specifically, it wont speed him up, either.
It is the development of a specific dominant biomotor ability a fighter needs to focus on, not just “I wanna get big, man.”
ItÂ’s a matter of goals, in no way does strength training slow a fighter down, nor hurt his flexibility and endurance, but a body building programmed focusing only on gaining size certainly can.
(i) Muscles supply their own vascularization—increase your muscle mass and there's a concommittant increase in local capillary density, so no matter how muscular you get, you're still going to be supplied with nutriants for as much muscle as you have. And muscle growth doesn't involve the slightest decrease in activation time for the muscles involved: the same neural units activate larger muscle bundles as smaller ones, and again, synaptic connections increase as muscle size (indeed any `active' tissue mass) increases. So where would a `slowdown' come from??
Yes, the same neural units activate the muscle regardless of size. However, the type of training does impact the speed at which the muscle fibers can be recruited and the percentage of total muscle fibers recruited. This has a specific effect on starting power, reactive power, speed, and endurance and so each biomotor ability must be trained as such. The speed of contraction is “load related” – that is why you have more force at the beginning of a contraction than at the end. As you know, muscles have “motor nerves” and “sensory nerves” – It is the motor nerves that relate to movement. The motor nerves send impulses from the nervous system to the “motor end plate” which result in muscle contraction. Each muscle has special fibers – that facilitate contraction. The ability a muscle has to contract or exert an amount of force is based on the type of fiber it is – its length, and the actual number of fibers within the muscle. The number of fibers is pretty much set, the rest can be manipulated through training.
A single motor nerve together with muscle fiber is a “motor unit”. You mentioned that
the same neural units activate larger muscle bundles as smaller ones, and again, synaptic connections increase as muscle size (indeed any `active' tissue mass) increases.
Yes, but while the muscle fibers respond to the stimulation of the motor nerve within a single motor unit, not all motor units are activated during a muscle contraction.
The actual number of motor units involved in a contraction depends on the load imposed on the muscle and the contraction duration (600 milliseconds vs. 150 milliseconds). In this regard, a “body building / hypertrophy specific” program would use a moderate load, (say 8 to 12 reps) and recruit a smaller number of total motor units and thus the strength of the contraction is low. Extremely heavy loads recruit all, or almost all, motor units thus training maximal force output (or speed/power).
In addition, motor units are recruited in sequence, and the only way to train the entire muscle is to use maximum loads where every motor unit is recruited.
This begs the question, do we want to train Type I (slow twitch ) or Type II (fast twitch) muscle fibers? What biomotor ability is most prominent in your sport or type of competition?
For example, while endurance (both cardio and muscular) is important to the fighter planning on going 15 rounds (or 5 three minute rounds) he will still rely heavily on fast twitch muscle. This is even more the case for the guy training with self-defense in mind, where speed and force production is of the essence. Fast twitch fibers are used in short, fast burst type activities (a jab, front kick or parry) it is not only the speed of the contraction that that causes motor nerves to recruit fast twitch fibers, but the force of the muscle. This is why athletes that require explosive movements must increase power – Body building programs fail to utilize the contraction speed needed, or the load needed, to fully recruit motor units and the full range of fast twitch fibers. As fighters, we are often concerned with explosive strength. “The ability to produce maximal forces in minimal time is called explosive strength. Strong people do not necessarily possess explosive strength.” The development of one strength quality (ex. max-strength) does not guarantee the development of another
I appreciate the questions and points. I hope this helps explain what I meant, and my view on training. I should note, that most of this info came from my PDBIO classes, the direct quotes and definitions of strength types came from Tudor Bompa, and Ross Enamait. I strongly recommend their material.
Thanks for the conversation sir!