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Peer Reviewed Studies Discussion / Re: Fiber type is irrelevant for size and strength...but for speed and power...it is
« on: June 08, 2009, 04:34:48 pm »
nice, I like the shotputter study.. studies like that really hold some weight..
thanks KB, some good stuff in there.
my bad, i was actually doing the TOC for you.. glad i modified it as you were doing it, so it didn't overwrite your post.
1. The influence of variations in muscle fibre composition on muscle strength and cross-sectional area in untrained males.Maughan RJ, Nimmo MA.
2. Muscle strength from adolescence to adulthood--relationship to muscle fibre types.
Glenmark B, Hedberg G, Kaijser L, Jansson E.
Department of Clinical Physiology, Karolinska Hospital, Stockholm, Sweden.
3.
4. Muscle fiber number in biceps brachii in bodybuilders and control subjects.
MacDougall JD, Sale DG, Alway SE, Sutton JR.
5. Muscle hypertrophy in bodybuilders.
Tesch PA, Larsson L.
6. Leg extension power and muscle fiber composition.
Coyle EF, Costill DL, Lesmes GR.
7.
thanks KB, some good stuff in there.
my bad, i was actually doing the TOC for you.. glad i modified it as you were doing it, so it didn't overwrite your post.
1. The influence of variations in muscle fibre composition on muscle strength and cross-sectional area in untrained males.Maughan RJ, Nimmo MA.
Quote
From the results it can be concluded that there is no difference in the force per unit area which can be generated by the different muscle fibre types present in human skeletal muscle. Variations in muscle fibre composition between individuals cannot, therefore, account for the large variations observed in the ratio of strength to muscle cross-sectional area.
2. Muscle strength from adolescence to adulthood--relationship to muscle fibre types.
Glenmark B, Hedberg G, Kaijser L, Jansson E.
Department of Clinical Physiology, Karolinska Hospital, Stockholm, Sweden.
Quote
The sex differences in strength increased from age 16 to 17 years. Body dimension, sex, percentage of type II, mean fibre area and the activity index contributed to explaining 50-75% of the strength at both ages. Different changes in relationship between fibre type composition and strength in women and men was seen with increasing age. In the women, the relationship between strength and the percentage of type II fibres changed with age (from 16 to 27 years of age) from a positive correlation (only Sargent jump) to negative correlations for all the strength tests, i.e. the more type I fibres the stronger the subject.
3.
Quote
The maximal torque correlated strongly to the muscle cross-sectional area times an approximative measure on the lever arm (body height). Maximal tension developed per unit of muscle cross-sectional area did not correlate significantly with per cent type I fibre area and did not differ between the female and male students or bodybuilders. Neither did the relative decrease in torque with increasing contraction velocity show any significant relationship to the per cent type I fibre area.
4. Muscle fiber number in biceps brachii in bodybuilders and control subjects.
MacDougall JD, Sale DG, Alway SE, Sutton JR.
Quote
We conclude that in humans, heavy resistance training directed toward achieving maximum size in skeletal muscle does not result in an increase in fiber numbers.
5. Muscle hypertrophy in bodybuilders.
Tesch PA, Larsson L.
Quote
Values for fiber type composition and fiber size were more similar to values reported for physical education students and non-strength trained individuals. The results suggest that weight training induced muscle hypertrophy may be regulated by different mechanisms depending upon the volume and intensity of exercise
6. Leg extension power and muscle fiber composition.
Coyle EF, Costill DL, Lesmes GR.
Quote
These data suggest that muscle fiber composition becomes increasingly more related to power performance as the velocity of movement increases.
7.
Quote
The large difference between type I and type II fiber size, even in the untrained state, in both shot putter 1 and his brother is not usually seen in humans and maybe a genetic characteristic. We suggest that the ability to selectively increase the relative area of his type II fibers in the 15 years of strength training was a key element in his success as a shot putter. The observed increase in the expression of fast myosin light chain mRNAs in both fiber types is indicative of further adjustment of the myofibrillar apparatus towards the generation of very high peak power.