- 04-25-2011, 06:24 PM
- 04-25-2011, 11:07 PM
04-26-2011, 11:59 AM
Certain movements and/or angles will put greater emphasis on the a region of fibers of a particular muscle. Incline presses place greater emphasis on the upper fibers of the pecs. Cable crossovers can place greater emphasis on the "inner" fibers of the pec. Decline presses place greater stress on the fibers of the lower pec.s
Pull ups place greater emphasis on the upper fibers of the lats, and chin ups place more emphasis on the lower fibers of the lats.
Incline curls place more emphasis on the long head fibers of the bicep, and preacher curls place more emphasis on the inside short head fibers.
04-29-2011, 11:23 AM
There are two heads to the pec major: clavicular and sternal. The fibers run horizontal. You can put emphasis on the upper vs. lower fibers, but not on the internal vs. external fibers.
The lat is one muscle with one head. The teres major are often mis-termed the upper lats. Pull ups with an overhand and wider grip will result in both lat and teres major recruitment. Chin ups with the elbows close to the body decreases teres major involvement and increases lat involvements.
Not so sure about the two heads of the biceps; however both run from scapula to radius, and I don't believe changing angle of the shoulder will switch emphasis from one to the other. Many people confuse the brachialis, which lies under neath the biceps closer to the elbow, for the lower biceps.
04-29-2011, 03:20 PM
I made the mistake in my early training in just training flat and decline bench cause I hated incline. I paid for it later then my development was off and I looked very flat on the superior portion (clavicular head) of my pec major. I had to double the effort to help even it out for a more symmetrical appearance.
Serious Nutrition Solutions rep
05-03-2011, 09:01 PM
As a side note, I have found that the angle of most non-adjustable benches is too steep and puts too much focus on the anterior delts. There are only a few benches at my gym that let me adjust them to a shallow enough angle to really hit my upper pecs when I do incline dumbbell press. I really wish the equipment manufacturers would make their benches with much shallower angles for incline.
05-05-2011, 10:09 PM
05-11-2011, 02:15 PM
It's one of those bodybuilding myths. You can only emphasize more muscle fibers. not target certain areas of the chest. Some research that I've seen has showed that a decline press will activate the most muscle fibers in the chest. Really though you have to do what works for you. Do the exercises that you feel the most. I mainly do flat stuff. Doing flys because you think it will round out your chest isn't going to help. Your limited to the genetic shape of your muscle. Do flys or whatever exercise because you feel it the most, not because of area you think it will target. I personally love push-ups. They are the ultimate builder IMO.
ôLord, whom shall we go away to? You have sayings of everlasting life"- John 6:68
05-11-2011, 04:25 PM
05-11-2011, 04:41 PM
05-11-2011, 05:14 PM
05-11-2011, 10:06 PM
ôLord, whom shall we go away to? You have sayings of everlasting life"- John 6:68
05-11-2011, 10:21 PM
Suffer now.. and live like a champion later.
05-12-2011, 11:26 PM
You target your inner chest with a closer hand grip. You target your outer chest with a wider hand grip. Haven't you ever heard of diamond push ups, they focus stress on your inner pectorals and your Triceps. You can combine inner chest workouts with incline or decline as you can with outer chest workouts.
05-13-2011, 09:03 AM
We know the fibers of the pecs run horizontal. We also know that there are two heads of the pecs, clavicular (collar bone) and sternal (ribs). And, we know from EMG readings that while certain exercises can result in stronger contractions higher or lower in the pecs, there is no evidence to even suggest that a difference in contraction takes place between the medial (inner) or distal (outer) attachments.
05-15-2011, 09:32 AM
Good thread, and one that comes up quite often on every bodybuilding forum. Something to take away from it is, not to neglect either the flat or incline bench if you're serious about pec development.
I personally like to rotate every month or so, emphasing on one or the other - i.e. if I'm going to emphasise my incline, I'll do incline before bench, and a few more sets at a higher intensity. Then when I want to emphasis flat, I'll do the opposite.
Always depends on the individual tho.
05-19-2011, 08:10 PM
06-13-2011, 03:34 PM
Muscle fibers ONLY pull toward their center. You cannot tell it to pull toward one side more than the other.
As for the inner and outer grip...the only thing your manipulating is the amount of tension your triceps have during the movement. Inner grip works more tris, outer grip helps to activate more pec major fibers.
You cannot pretend to know A&P just cause you workout.
06-13-2011, 05:22 PM
Studies may not validate that different areas of the pectorals can be targeted, but the burning in my chest validates it enough for me. After some workouts my outer chest burns and is sore but not the inner. Then, after other types of workouts the inner portion of my chest burns while the outer doesn't feel anything. It may just be in my mind but I don't see how it could be. Of course, I failed A&P the first time I took it so theres no tellin lol.
06-13-2011, 05:34 PM
I haven't seen any studies, but personally I feel I can target my inner and outer, by changing grip.
I've been able to get that defined line down the middle, only by certain exercises. Not sure what it's called, but holding two dumbells together and pushing on a slight incline, seems to work for this, for me... just saying. Not sure why or how though...
But you can test this yourself. Flex the pec on one side of your chest, while slowing moving your arm to the opposite side, and feel the inside of your chest. As your arms gets closer to the center (ie: narrow grip), if you use your other hand to feel it, you should feel the inner portion of your pec really harden/tighten up. As you move your arm back out wide, the tension moves more to your front delt/outer chest.
06-14-2011, 11:59 AM
06-14-2011, 11:03 PM
Neuromuscular physiology is not my strong suit, but this is interesting because I feel their must be some relationship between muscle length during a contraction, and where the most tension is placed within the muscle. In other words, does muscle tension remain evenly spread throughout the entire pec major (or one of the heads) during a complete muscle contraction... or does it transfer inward from the origin/insertion towards the middle as the muscle shortens?
I would instinctively say that the latter is true, but I haven't studied the neuromuscular aspects of weight-training yet so I'm truly not sure.
06-15-2011, 08:10 AM
The origin of the the sternal head of the pec major is quite expansive, however. It includes the sternum, the first 7 or 8 costal cartiliges, and even a little bit onto the apneurosis (connective tissue) of the external obliques. That said, the origin of the pec depending on the fiber may be the sternum (ie. inner) or further onto the costal cartilige (outter). Displacement of where the fibers originate and rib cage structure are just one of the genetic make ups that account for various shapes of developed pecs between individuals.
During contraction, however, the entire fiber shortens. One nerve innervates a number of muscle fibers...not several nerves innervating different areas of each fiber.
06-15-2011, 02:53 PM
06-15-2011, 04:45 PM
I guess I'm referring more to muscle damage than actual motor recruitment. I agree you cannot target the recruitment of motor neurons in different parts of a single muscle. What i'm not sure about is whether or not different angles, exercises, contraction length etc... create more stress tension on various parts of a single muscle (i.e. the inner/outer portion of the pec major). And if so, would this lead to more muscle damage and hypertrophy of a particular portion of the pec or not.
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