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workout...Muscle hypertrophy is a scientific term for the growth and increase of the size of muscle cells.It differs from muscle hyperplasia, which is the formation of new muscle cells.Bodybuilder showing extensive muscle hypertrophy.During puberty in males, hypertrophy occurs at an increased rate.Natural hypertrophy normally stops at full growth in the late teens.Types of hypertrophy
There are two different types of muscular hypertrophy: sarcoplasmic hypertrophy and myofibrillar hypertrophy.Types of myofibrillar hypertrophy
Myofibrillar hypertrophy can, in theory, arise through two processes:
Increase in the number of nuclei within each muscle fiber, or
Increase in the amount of contractile material supported by each nucleus.The latter is the usual means of muscle hypertrophy.Within just a few days, an untrained individual can achieve measurable strength gains resulting from "learning" to use the muscle.As the muscle continues to receive increased demands, the synthetic machinery is upregulated.Muscle hypertrophy due to strength training does not occur for everyone, and is not necessarily well correlated with gains in actual muscle strength: it is possible for muscles to grow larger without becoming much stronger.The additional contractile proteins appear to be incorporated into existing myofibrils (the chains of sarcomeres within a muscle cell).These events appear to occur within each muscle fiber.Experts and professionals differ widely on the best approaches to specifically achieve muscle growth (as opposed to focusing on gaining strength, power, or endurance); it is generally considered that consistent anaerobic strength training will produce hypertrophy over the long term in addition to its effects on muscular strength and endurance.In order to get the best gains out of training sessions, experts agree on some basic principles, however some are contradicted by other research:
Progressive overload is considered the most important principle behind hypertrophy, so increasing the weight, reps and sets will all have a positive impact on growth.Some experts create complicated plans that play around with weight, reps and sets, increasing one while decreasing the others, to constantly shock the body into growing.When microtrauma occurs (from weight training or other strenuous activities), the body responds by overcompensating, replacing the damaged tissue and adding more, so that the risk of repeat damage is reduced.This is why progressive overload is essential to continued improvement, as the body adapts and becomes more resistant to stress.Skeletal muscle hypertrophy is initiated by microtrauma occurring in the exercised muscle tissue.The cells that make up the tissue (myofibers) are polynucleated, gaining additional nuclei from activated satellite cells, which fuse to the already mature muscle cell.In an effort to prevent future trauma, the nuclei, whose number has increased due to the signaling created by the exercise and integration of satellite cells, increase synthesis of sarcomeric proteins, such as actin and myosin, increasing the size of the myofibrils that make up the sarcomeres contained in the muscle cell.Skeletal muscle cells do not divide, size increases occur only at the sarcomeric level.Loon LJ, Goodpaster BH (2006).Prior BM, Yang HT, Terjung RL (2004).Tipton KD, Wolfe RR (2001)."Exercise, protein metabolism, and muscle growth".Dressman H, Thompson PD, Price TB, Hoffman EP, Angelopoulos TJ, Gordon PM, Moyna NM, Pescatello LS, Visich PS, Zoeller RF, Seip RL, Clarkson PM (June 2005).This page was last modified on 20 May 2008, at 18:23.All text is available under the terms of the GNU Free Documentation License.Hypertrophy is the increase of the size of an organ or in a select area of the tissue.Hypertrophy of the breasts
1.Depending on the type of training, the hypertrophy can occur through increased sarcoplasmic volume or increased contractile proteins.Changes can be beneficial or healthy if they occur in response to aerobic or anaerobic exercise, but ventricular hypertrophy is generally associated with pathological changes due to high blood pressure or other disease states.Gigantomastia is the extreme growth of the breasts, i.In severe cases it is possible for women to have breasts that weigh well in excess of 20 lb (9 kg) each.You can help Wikipedia by expanding it.This page was last modified on 18 May 2008, at 23:17.Background The childhood onset of idiopathic cardiac hypertrophy that occurs without a family history of cardiomyopathy can portend a poor prognosis.We sequenced eight genes: MYH7, MYBPC3, TNNT2, TNNI3, TPM1, MYL3, MYL2, and ACTC.Source Information
From the Department of Genetics, Harvard Medical School (H.Partners HealthCare Center for Genetics and Genomics (H.Howard Hughes Medical Institute and Brigham and Women's Hospital (B.Department of Cardiology, Children's Hospital (A.NEJMoa075463) was published at www.Address reprint requests to Dr.Louis Pasteur, Boston, MA 02115, or at cseidmangenetics.Genetic Causes of Cardiac Hypertrophy.The incidence of left ventricular hypertrophy (LVH) increases with age and is more common in people who have high blood pressure or other heart problems.LEGAL CONDITIONS AND TERMS OF USE APPLICABLE TO ALL USERS OF THIS SITE.ANY USE OF THIS SITE CONSTITUTES YOUR AGREEMENT TO THESE TERMS AND CONDITIONS OF USE.As the diagrams show, the prostate is located in front of the rectum and just below the bladder, where urine is stored.The prostate also surrounds the urethra, the canal through which urine passes out of the body.One of its main roles, though, is to squeeze fluid into the urethra as sperm move through during sexual climax.This fluid, which helps make up semen, energizes the sperm and makes the vaginal canal less acidic.It is common for the prostate gland to become enlarged as a man ages.Doctors call the condition benign prostatic hyperplasia (BPH), or benign prostatic hypertrophy.For this reason, some researchers believe that factors related to aging and the testes may spur
the development of BPH.Throughout their lives, men produce both testosterone, an important male hormone, and small amounts of estrogen, a female hormone.As men age, the amount of active testosterone in the blood decreases, leaving a higher proportion of estrogen.Studies done with animals have suggested that BPH may occur because the higher amount of estrogen within the gland increases the activity of substances that promote cell growth.DHT), a substance derived
from testosterone in the prostate, which may help control its growth.Most animals lose their ability to produce DHT as they age.However, some research has indicated that even with a drop in the blood's testosterone level, older men continue to produce and accumulate high levels of DHT
in the prostate.This accumulation of DHT may encourage the growth of cells.Scientists have also noted that men who do not produce DHT do not develop BPH.Symptoms
Many symptoms of BPH stem from obstruction of the urethra and gradual loss of bladder function, which results in incomplete emptying of the bladder.More frequent urination, especially at night.The size of the prostate does not always determine how severe the obstruction or the symptoms will be.Some men with greatly enlarged glands have little obstruction and few symptoms while others, whose glands are less enlarged, have more blockage and greater problems.Such medicines contain a decongestant drug, known as a sympathomimetic.It is important to tell your doctor about urinary problems such as those described above.In 8 out of 10 cases, these symptoms suggest BPH, but they also can signal other, more serious conditions that require prompt treatment.Urine retention and strain on the bladder can lead to urinary tract infections, bladder or kidney damage, bladder stones, and incontinence.If the bladder is permanently damaged, treatment for BPH may be ineffective.The New York Times Company.Neural Response
The first measurable effect is an increase in the neural drive stimulating muscle contraction.Within just a few days, an untrained individual can achieve measurable strength gains resulting from "learning" to use the muscle.Genetic Response
As the muscle continues to receive increased demands, the synthetic machinery is upregulated.Although all the steps are not yet clear, this upregulation appears to begin with the ubiquitous second messenger system (including phospholipases, protein kinase C, tyrosine kinase, and others).These genes appear to dictate the contractile protein gene response.Protein Synthesis
Finally, the message filters down to alter the pattern of protein expression.There appears to be some limit to how large a myofibril can become: at some point, they split.That is, hypertrophy results primarily from the growth of each muscle cell, rather than an increase in the number of cells.
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