Sequence Your Training for Optimal Results
by Chris Mason
With the recent massive increase in the popularity of training multiple fitness components simultaneously (CrossFit being the driving force of this movement) the topic of exercise sequencing for optimal results has become particularly poignant.
Physical fitness and performance are comprised of many different specific attributes. For example, strength has many forms all of which contribute to the body’s ability to move through space. Strength can be viewed as a spectrum ranging from starting strength (the ability to produce maximal force in the first 30 milliseconds of movement), to explosive strength (the ability to very quickly, albeit not quite as quickly as starting strength, generate a high degree of force), to maximal strength (the ability to volitionally produce the highest force possible). Muscular endurance, the ability to produce relatively low levels of force for prolonged periods, also has a strata with things like speed endurance and strength endurance.
Each attribute above and more must be trained in order to excel physically across a broad spectrum of performance markers. In short, you must get good at a lot of stuff to be a well-rounded athlete. The decathlete has historically best exemplified the all-around athlete, but the best of the best CrossFitters now equally well personify one.
As training time is limited for most athletes those that seek to be all-around machines must organize their training to permit optimized adaptation to all physical traits which are being worked. If all, or multiple attributes are to be trained in a single session the order should be as follows:
1) Technique or skill work
2) Speed work
3) Strength work
3) Endurance work of all forms with speed endurance work being done first to be followed by lower intensity prolonged exercise
Following the order prescribed above will allow for maximized results within the confines of training multiple attributes in a single session. A similar order should be followed when training will target multiple attributes via individual sessions over the course of several days. Care must be taken in those situations to permit recovery of the nervous system after endurance work prior to the next skill, speed, and or strength session. Either a day or two of rest or active rest are recommended.
A Special Note about the Nervous System and Performance
Technique or skill work for athletics are generally understood to be essentially wholly a function of the nervous system. What is perhaps less generally well known is that strength and speed work are also almost exclusively the domain of the nervous system. They may be less known in the scientific sense, but we can all empirically appreciate it as each of us have tried, at one point or another, to perform a high intensity activity when already fatigued from a lower intensity effort and know the sense of a lack of coordination and explosiveness which are manifest at such times.
In a simplified nutshell, lower intensity prolonged activities exert a negative effect on the nervous system in the short and mid-term. They reduce coordination, increase reaction time, and increase the chance of injury when higher intensity activities succeed them prior to complete recovery.
There is a paucity of scientific explanation for the specific causes of this central nervous system fatigue (central fatigue). One generally agreed upon factor is an increase of serotonin (5-HT) in the brain. This is thought to occur due to an increase in brain levels of free tryptophan (f-TRP) which is an amino acid precursor for 5-HT production.
During prolonged exercise f-TRP transport across the blood brain barrier increases due to two main causes. One has to do with tryptophan and albumin. Tryptophan (TRP) binds to albumin in the blood. During endurance exercise, blood borne fatty acid levels increase. Fatty acids displace TRP from binding to albumin thus increasing f-TRP.
The other main cause relates to branched chain amino acids (BCAA). F-TRP (i.e. unbound TRP) competes with the BCAA for transport to the brain thus a decrease in circulating BCAA will result is more f-TRP being able to pass to the brain. Prolonged exercise decreases circulating BCAA as the skeletal muscles take them up and oxidize them for energy.
While the science as to the specific physiologic cause(s) of central fatigue is scant, there is no lack of scientific and empirical evidence verifying the existence of central fatigue as a result of prolonged endurance exercise. There is also no lack of scientific and empirical data verifying the proper sequencing of exercise for specific adaptations. Take care to properly sequence your training and you will permit the best results possible.
Chris Mason is the owner of AtLarge Nutrition, LLC and an accomplished author in the fitness genre. He has written for numerous websites and magazines to include The CrossFit Journal and Iron Man Magazine.