To understand and study the process of muscle recovery and repair, it is
useful to develop a
MODEL. Modeling the biochemical reactions to stress and the observed effects
such as
soreness allow for a better understanding of the events and TIME COURSE
necessary for
muscle recovery. Such a model comes from the study of the wound healing
process;
particularly the inflammatory reponse (7,9). Whenever muscle cells are
subjected to high
intensity anaerobic training stress, damage occurs at the cellular level
(1-4,7-9). The DEGREE
of damage depends upon the degree of intensity--the higher the intensity,
the greater the
damage (2,4,5,7,9,10). It is the process of healing this damage which then
makes the muscle
cell larger and stronger(2,9).
Recovery from training stress requires a number of steps; each of which
must proceed to
completion UNINTERRUPTED for COMPLETE recovery and adaptive response (7,9).
While the exact mechanisms are unclear at the present time and subject
to further research and
clarification, it is thought that acute inflammation is the initial response
to muscle cell damage
(7,9,10). This is especially the case where high intensity eccentric work
is performed such as
Negative Training, Hyper Training or when accentuating the Lowering of
the weight during
standard repetitions. Delayed-onset muscle soreness is thought to be one
of the effects of this
acute inflammatory response as well (1-8,10). This sequence of events occurs
in the following
manner and time:
1.Connective and/or contractile tissue (muscle cell) damage occurs during
intense muscular
contraction, particularly eccentric action (1-10).
2.Within the first 24 hours, levels of neutrophils (white blood cells which
respond to injury)
increase and migrate to the site of injury or exercise trauma (1,6,9).
3.At the same time, lysosomal enzymes which digest and break down damaged
tissue are
released and this breakdown activity commences (3,6,8,9,10).
4.Macrophages (cells which aid lysosomes and synthesize a variety of chemicals
in
response to inflammation) begin to accumulate around 24 hours and continue
to do so for
up to several days. One of the chemicals these cells secrete, PGE2, is
believed to make
nerves , more sensitive to pain and may help explain soreness sensations
starting 24
hours or so after exercise, and lasting for as long as 7 or more days (1-7,9,10).
5.This inflammatory response causes further damage to the affected area
and may continue
for several days beyond imposition of the INITIAL training stress damage
(1,6,7,9).
6.Once these initial inflammatory responses (steps 1-5) are completed,
then signs of the
BEGINNINGS of tissue regeneration (rebuilding of the muscle) can be observed
(4,7,9).
The muscle cell must first rebuild to normal levels of structure and function
and then, only
then, and only IF allowed FURTHER TIME, will it supercompensate and build
up to levels
GREATER than before. The next question is: How long does this ENTIRE process
take?
It must be remembered that the severity of response and so the time necessary
to complete it
vary according to the degree of trauma or in this case, the intensity of
the work, the muscle
has been subjected to (2,4,5,10). Numerous studies have examined this response
process,
especially with eccentric contractions (1-10). The time course for completion
of the above 6
steps ranges from 5 days to over 6 weeks (1-10)! This has profound implications
regarding
FREQUENCY of training! The more intense your training, the longer you must
allow for
recovery. If you add 50% to the weight you normally use for high intensity
repetitions and
then proceed to perform NEGATIVE repetitions, you have just dramatically
increased the
stress and therefore the TIME necessary for the muscle to recover. One
concrete training
example may help further clarify these ideas.
From mid-July to mid-October 1997, my training partner and I increased
our Squat and
Deadlift poundages 49% and 70%, respectively. We used standard repetition
protocol--2
seconds concentric (raising) and 4 second eccentric (lowering). We terminated
sets when no
more full-range, unassisted reps were possible. In other words, we performed
no Forced Reps,
Negatives or any other technique which would have increased the intensity
of the sets. Further,
we had been performing only 2 sets per workout every 7 days on Mike's Consolidation
Routine.
By early November, we had experienced 2 consecutive workouts with no further
progress in
any of our sets. We then took 23 days off. We returned to the gym and we
were now able to
add 10% to the Squat poundages for the same number of reps as our previous
squat workout
AND we had not performed squats for 30 days!
At first, this may seem beyond belief--an absolute impossibility! Not,
however, if you
understand recovery from the standpoint of the inflammatory response and
recovery model
outlined in steps 1-6 above. It is important to never forget that high
intensity anaerobic weight
training stress is a study properly subsumed under the heading of MEDICAL
SCIENCE. As
such, medical science can teach us much, but as pioneers in the field of
high intensity,
anaerobic exercise, so too can we teach medical science much!
1) Clarkson, PM, Nosaka, K. Muscle function after exercise-induced
muscle damage and rapid
adaptation. Medicine and Science in Sports and Exercise. Vol.24, No.5,
512-20, 1992
2) Clarkson, PM, Tremblay, I. Exercise-induced muscle damage, repair and
adaptation in
humans. Journal of Applied Physiology. Vol.65, No.1, 1-6, 1988
3) Friden, J.,et al Myofibrillar damage following intense eccentric exercise
in man. International
Journal of Sports Medicine. Vol.24, No.3, 170-176,1983
4) Golden, CL, Dudley, GA., Strength after bouts of eccentric or concentric
actions. Medicine
and Science in Sports and Exercise. Vol.24, No.8, 926-33, 1992
5) Howell, JN, Chleboun,G., Muscle stiffness, strength loss, swelling and
soreness following
exercise-induced injury to humans. Journal of Physiology 464, 183-96, 1993
6) Jones, DA, Newham, JM., et al, Experimental human muscle damage: morphological
changes in relation to other indices of damage. Journal of Physiology 375,
435-48, 1986
7) Mishra, DK, Friden, J., et al Anti-inflammatory medication after muscle
injury. Journal of
Bone and Joint Surgery, Vol. 77-A, No.10, 1510-19, 1995 8) Newman, DJ,
Jones, DA.,
Repeated high-force eccentric exercise: effects on muscle pain and damage.
Journal of Applied
Physiology Vol.4, No.63, 1381-86, 1987
9) Smith, LL. Acute inflammation: the underlying mechanism in delayed onset
muscle
soreness? Medicine and Science in Sports and Exercise Vol. 23, No.5, 542-51,
1991
10) Tiidus, PM, Ianuzzo, DC., Effects of intensity and duration of muscular
exercise on
delayed soreness and serum enzyme activities. Medicine and Science in Sports
and Exercise
Vol. 15, No.6, 461-5, 1983