MAF FITNESS NEWSLETTER

Vol. II, Issue 5, May 1995



T he subject of this month's issue is exercises for the muscles of the back, specifically the Trapezius, Rhomboids, Latisimus Dorsi, Erector Spinae, and the Posterior Deltoids (see Note 1) are also involved even though they are shoulder muscles, and will be addressed again in a later issue of this newsletter. Because of the large area and the number of muscles involved, the back will be treated as three separate areas, with a set of exercises for each.

UPPER BACK - This is primarily the Trapezius muscle.


Figure 5-1

MIDDLE BACK - This is primarily the Latisimus Dorsi muscle.

LOWER BACK - This is primarily the Erector Spinae muscle group.

_______________________________
Note 1 - This note describes the location and basic function, in very general terms, of the muscles mentioned. The trapezius is a kite shaped muscle, which attaches at the base of the skull, runs down the neck, where it fans out to the shoulders, then angles down to where it attaches to the bottom of the spine. It is involved in elevation of the scapulae, as in "upright rows." The rhomboids (major and minor) run between the bottom of the cervical vertebrae and upper thoracic vertebrae, and the medial borders of the shoulder blades (scapulae). They basically move the shoulder blades (scapulae) toward the spinal column, as in "cable rows." The latisimus dorsi muscle has an attachment on the upper, medial side of the humerus, and fans out to where it attaches to the lower spine and the hip girdle. The "lats" are heavily involved in "pulling" movements, like "chinups." The erector spinae runs from the hip girdle up, on each side of the spinal column, to where it attaches to the base of the skull. It is involved in spinal extensions, as in "dead lifts." The posterior deltoids are actually the rear part of the triangular muscle that caps the shoulders, and are not separate muscles. They are involved in "pulling" movements, like in "bent rows."
_______________________________

* * * * *


QUESTIONS AND ANSWERS

Q I have been exposed to some confusing information about eating, both before and after exercise, and about glycogen (see Note 2) replacement after exercise. Can you enlighten me?
M.C.A.C., Sunnyvale, CA

A After talking to Dorie Krepton, M.S. of the Health and Fitness Institute (HFI) in Hayward, CA, and Gail Butterfield, Ph.D. an acknowledged expert in sports nutrition; and some additional research, I can offer you the following information. First, eating within 90 minutes of exercise. It is best not to (there are some physiological reasons not to), but it won't kill you, and as Donald Chu, Ph.D. (HFI) says, "eat when you can." For instance, a friend and I used to run a hilly 7-miler with his fast, 50-year-old uncle, immediately after he ate dinner. Most people couldn't tolerate that. On the other end of an exercise session, it seems that eating 50-100 grams of carbohydrates facilitates rapid glycogen replacement. There seems to be a two-hour "window" after exercise, and the quicker it is used, the more efficient it is. Studies have been done with two, four, and six hour windows; and the stored glycogen was greatest after two hours. It should be noted that rapid glycogen restoration is only significant for those who do two-a-day sessions, or long endurance events, like running a marathon. For a 40 minute aerobics class, or a normal weight training session, glycogen wouldn't ordinarily be depleted to a significant level. A normal diet, and normal subsequent glycogen restoration should be sufficient.

Q I have been told that aerobic exercise and weight training are "incompatible." What does that really mean?
A.S., WA D.C.

A The answer to your question depends on your goal. If, for example, you are a runner, weight training may improve your performance. Many college or Olympic level runners (and more casual runners, as well) include weight training in their fitness programs. If strength development is your goal, it appears that weight training isn't adversely affected by running, or any other aerobic activity. However, if muscle growth is your goal, aerobic activities can have a negative effect. But, even professional body builders do some aerobics, for cardiovascular fitness and to "burn" fat get cut up. This information is supported by a recent study done by the U.S. Army, as reported in the March 1995 Penn State Sports Medicine Newsletter. For those who want to do both activities, it is recommended that they be divided into separate sessions different days, or different sessions (four or five hours apart) on the same day. If you have to do them together, do the highest priority activity (aerobics, or weight training) first, because the initial activity may leave you too tired to get the most out of the second one.

Q There is supposedly a large genetic factor involved in how fat one is. Does that mean that weight management is doomed to failure?
N.M.K.F., Las Vegas, NV

A No! There are still many mysteries regarding body composition, and the X-factor. The genetic component is not fully understood, but at least one thing seems fairly clear, and that is that one's genetic "map" seams to determine where an individual will store fat. There is the "android," or male-fat-patternwaist, abdomen, which isn't exclusively male; and the "gynoid," or female-fat-pattern hips, thighs, not limited to women. This genetic distribution seems to be related to a hormone called Lipoprotein lipase (LPL), which seems to be essentially a fat storing hormone. Where a person tends to get fat has been found to contain an abundance of this hormone, but, it doesn't necessarily make you excessively fat, unless your diet and activity level are out of synch. There is no "final word" here; research is still going on. But one thing seems clear, and that is that no matter what your genetic predisposition is, it is still your option to make the best out of what you've got.

_______________________________
Note 2 Glycogen is the storage form of glucose, which is the resulting fuel source from carbohydrate metabolism. The brain can only be fueled by glucose, and fat is only burned in the presence of glucose. It is easy, therefore, to understand the need for glycogen restoration after exercise. It should also be noted that the capacity for glycogen storage is not unlimited, unlike fat.
_______________________________




_______________________________
For questions, call (408) 739-0501, or write to:
MAF, 964 Ponderosa Ave., Suite 25, Sunnyvale, CA 94086-8931.
Email to Mike_Fenner@netcom.com