I’m new here, thought I’d post my introduction here then reply to this subject since it has fascinated me for so long
I was refered to your forum on the Supertraining digest, once I started reading your posts I started itching to participate. I have been looking, for years, for a forum that is real “sciency”
I myself, am not a sprinter or into running, just a recreational weightlifter with passion for muscle physiology and all those interesting type subjects.
I have tried on many forums to get some good talk going on things like sarcoplasmic hypertrophy etc, but cannot coax anyone to ‘get into it’
This thead is really great and makes a lot of good points. I too have also thought the theory sounded plausable but was wanting for some evidence. I finally came across a couple studies on Pubmed that point to the phenomena of sarcoplasmic hyertrophy, I’ll guess I’ll just post them and let you guys comment on them
(sorry if you have already seen these and they are ‘old news’ )
Muscle ultrastructural characteristics of elite powerlifters and bodybuilders.
MacDougall JD, Sale DG, Elder GC, Sutton JR.
Muscle ultrastructure of a group of subjects possessing extreme hypertrophy was compared with that of a control group which had undergone 6 months of heavy resistance training. Two needle biopsies were taken from triceps brachii of two international calibre powerlifters and five elite bodybuilders. In addition, samples were taken from five healthy volunteers before and after 6 months of training of the elbow extensors. One biopsy was prepared for electron microscopy and analyzed stereologically, and the other was stained for myosin ATPase activity and photographed under the light microscope. Despite large differences in elbow extension strength and arm girth there was no significant difference in fibre areas or percentages of fibre types between the elite group and the trained controls. This suggests that the elite group possessed a greater total number of muscle fibres than the controls did. Mitochondrial volume density of the elite group was similar to that of the control group following training but significantly less (p less than 0.05) than the pretraining control measurements. Myofibrillar volume density was significantly lower and cytoplasmic volume density significantly higher in the elite group than in the trained controls. There was a considerably higher incidence of structural abnormalities including central nuclei and atrophied fibres in the elite group than in the control group, which might possibly have been associated with the use of anabolic steroids by the elite group.
Characteristics of muscle-cellular adaptation to intense physical loads.
Brzank KD, Pieper KS.
We studied the influence of a 5-weeks training program, mainly with intense work-loads in form of explosive power, on the skeletal muscle system in 7 male sports students. Muscle biopsy specimens from m. vastus lateralis were analysed histochemically, biochemically and by means of electron microscopy. After the training of several weeks, a clear hypertrophy of FT-fibres (24%, p less than 0.05) and ST-fibres (20%, p less than 0.05) became evident. The fibre composition was not affected by the training program. The increase of mean cross-sectional areas of muscle fibres was not connected with any shifting of volume proportions of cellular compartments (volume density of mitochondria, myofibrils and sarcoplasm) at ultrastructural level. Only in the peripheric fibre region mitochondrial volume density increased from 5.9 +/- 2.5 to 8.3 +/- 1.2% in tendency. Contrary to endurance athletes and untrained subjects, power athletes show higher values of sarcoplasmic volume density in their muscle fibres. Results will be discussed in connection with specific demands of explosive powerful muscular performances.