what's the changes of muscle in different type exercise training

[match2011]

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weight lifting

marathon

sprint


what's the changes:

number of mitochondria
myoglobin concentration
number of myocyte
actin per myocyte
myofibril



Thanks

 

[Orthodoc2be]

weight lifting

marathon

sprint


what's the changes:

number of mitochondria
myoglobin concentration
number of myocyte
actin per myocyte
myofibril



Thanks

Marathon - this requires endurance, and, therefore, primarily utilizes Type I muscle fibers (slow oxidative). You will have an increase number of mitochondria (need an increase oxidative phosphorylation); [myoglobin] increases to provide muscle with more oxygen needed for oxidative phosphorylation; myocyte numbers never increase since they stay in the G0 phase; there may be an increase in the contractile proteins such as actin and myosin, but to a lesser degree than in weight lifting

Weight lifting - hypertrophy of type II muscle fibers (fast glycolytic); [mitochondria] doesn't really change; less myoglobin than in endurance athletes (white appearance of muscle due to lack of heme pigment in myoglobin); again, myocytes (aka muscle cells) don't increase...hypertrophy (not hyperplasia) is due to an increase in sarcoplasm and contractile elements such as actin and myosin within a myofibril

Sprint - basically the same as weight lifting, except you don't get as much hypertrophy of the muscle

 

[match2011]

got it

thanks

Marathon - this requires endurance, and, therefore, primarily utilizes Type I muscle fibers (slow oxidative). You will have an increase number of mitochondria (need an increase oxidative phosphorylation); [myoglobin] increases to provide muscle with more oxygen needed for oxidative phosphorylation; myocyte numbers never increase since they stay in the G0 phase; there may be an increase in the contractile proteins such as actin and myosin, but to a lesser degree than in weight lifting

Weight lifting - hypertrophy of type II muscle fibers (fast glycolytic); [mitochondria] doesn't really change; less myoglobin than in endurance athletes (white appearance of muscle due to lack of heme pigment in myoglobin); again, myocytes (aka muscle cells) don't increase...hypertrophy (not hyperplasia) is due to an increase in sarcoplasm and contractile elements such as actin and myosin within a myofibril

Sprint - basically the same as weight lifting, except you don't get as much hypertrophy of the muscle

 

[sgod34]

I understand the above comparisons in regards to type 1 vs type 2 muscle. However, I'm a little confused in the exact changes seen in weigh-lifting and sprinting. I understand since they are type 2 fibers they have less myoglobin and mitochondria than type 1 fibers, but if the question was asking the specific changes seen in type 2 muscle hypertrophy would you say no change to mitochondria and myoglobin, or increased (just not as much as type 1 would be). Also, in either type, is there any change to the number of myofibrils? Thanks!

 

[hyrule]

I understand the above comparisons in regards to type 1 vs type 2 muscle. However, I'm a little confused in the exact changes seen in weigh-lifting and sprinting. I understand since they are type 2 fibers they have less myoglobin and mitochondria than type 1 fibers, but if the question was asking the specific changes seen in type 2 muscle hypertrophy would you say no change to mitochondria and myoglobin, or increased (just not as much as type 1 would be). Also, in either type, is there any change to the number of myofibrils? Thanks!

Based on what I've learned, I don't think there will be an increase in # of myofibrils. There is an increase in proteins: actin and myosin, for example. There are also 2 types of hypertrophy associated with lifting.. I doubt you have to know these for boards though:

Sarcoplasmic hypertrophy: think bodybuilders
Myofibrillar hypertrophy: think skinny Olympic lifters who lift 700lbs