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<blockquote data-quote="BigTex" data-source="post: 235019" data-attributes="member: 43589"><p>Here is what science has found out in the last few years. There are thought to be two types of hypertrophy:</p><p></p><p>[ATTACH=full]26110[/ATTACH]</p><p>We know myofibrillar hypertrophy is accomplished via the growth and multiplication of the myofibrils inside each muscle fiber. This is thought to happen optimally in the lower repetition ranges (1-5) with heavy weight. This type of hypertrophy is more functional, so the muscles get much stronger.</p><p></p><p>Sarcoplasmic hypertrophy in theory is accomplished by the expansion of the sarcoplasm (the cytoplasm of the muscle) inside the muscle fiber. This is a more non-functional growth which is thought to kickstart hypertrophy process. When the muscle cell is super saturated with glucose and amino acids you feel more of a pump. This results in the sarcoplasm expanding at a significantly faster rate than the myofibrils grow and divide. This seems to be accomplished with higher rep ranges (6-15).</p><p></p><p>This probably explains the difference in musculature between powerlifters and bodybuilders. It also explains why your muscles feel different doing low reps and heavy weight and higher reps and lower weight.</p><p></p><p>Here is one of themore recent studies on sarcoplasmic hypertrophy</p><p></p><p>[URL unfurl="true"]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6550381/[/URL]</p></blockquote><p></p>
[QUOTE="BigTex, post: 235019, member: 43589"] Here is what science has found out in the last few years. There are thought to be two types of hypertrophy: [ATTACH type="full" alt="Hypertrophy.JPG"]26110[/ATTACH] We know myofibrillar hypertrophy is accomplished via the growth and multiplication of the myofibrils inside each muscle fiber. This is thought to happen optimally in the lower repetition ranges (1-5) with heavy weight. This type of hypertrophy is more functional, so the muscles get much stronger. Sarcoplasmic hypertrophy in theory is accomplished by the expansion of the sarcoplasm (the cytoplasm of the muscle) inside the muscle fiber. This is a more non-functional growth which is thought to kickstart hypertrophy process. When the muscle cell is super saturated with glucose and amino acids you feel more of a pump. This results in the sarcoplasm expanding at a significantly faster rate than the myofibrils grow and divide. This seems to be accomplished with higher rep ranges (6-15). This probably explains the difference in musculature between powerlifters and bodybuilders. It also explains why your muscles feel different doing low reps and heavy weight and higher reps and lower weight. Here is one of themore recent studies on sarcoplasmic hypertrophy [URL unfurl="true"]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6550381/[/URL] [/QUOTE]
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