{"id":2821,"date":"2020-09-07T11:27:42","date_gmt":"2020-09-07T17:27:42","guid":{"rendered":"https:\/\/strengthsenseiinc.com\/?p=2821"},"modified":"2021-08-31T15:04:00","modified_gmt":"2021-08-31T21:04:00","slug":"understanding-phasic-and-tonic-muscles","status":"publish","type":"post","link":"https:\/\/strengthsenseiinc.com\/2020\/09\/07\/understanding-phasic-and-tonic-muscles\/","title":{"rendered":"Understanding Phasic and Tonic Muscles"},"content":{"rendered":"\t\t
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Understanding Phasic and Tonic Muscles<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A closer look at the science of fast and slow-twitch fibers in program design<\/h6>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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By Strength Sensei CP
Publication Date: 2004<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Vladimir Janda was born in Czechoslovakia in 1928 and contracted polio at the age of 15, leaving him unable to walk for two years. He recovered and became a neurologist and exercise physiologist known for his pioneering work in corrective exercise. Not to
discredit Professor Janda\u2019s contributions to physical medicine, but many of his ideas cannot be applied to developing athletic superiority.\u00a0<\/p>

Especially popular with personal trainers who focus on so-called \u201ccore training,\u201d the terms tonic<\/i> and phasic muscles<\/i> refer to how muscles function. Tonic muscles are\u00a0considered postural muscles that provide stability and are designed to resist gravity (and\u00a0<\/span>are often called anti-gravity muscles). Typically, these muscles cross only one joint,\u00a0<\/span>involved in extension, and consist primarily of slow-twitch (Type I) muscle fibers. Janda\u00a0<\/span>believed these muscles are susceptible to being chronically shortened.<\/span><\/p>

Phasic muscles typically function to produce movement, often cross more than one joint, involved in flexion, and contain more fast-twitch (Type II) muscle fibers. Janda believed these muscles are susceptible to being chronically weak (or as Janda would say, inhibited).<\/p>

The practical application of this knowledge is that correcting postural problems often involved stretching tight tonic muscles (such as the iliopsoas and pectorals) and strengthening weak phasic muscles (such as the abdominals and glutes).\u00a0<\/p>

That\u2019s my understanding of what Janda taught, but this approach to classifying muscles has little application to designing programs for athletes. I say this because training affects how muscles perform.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Got fast-twitch? Andrei Aramnau does. This Belarus weightlifter won the 231-pound class in the 2008 Olympics, snatching a world record of 440 pounds. Eleven years later, competing in the 2019 World Weightlifting Championships, Aramnau took the silver medal in the 240-pound class and snatched 436 pounds, shown here. (This photo by Tim Scott, LiftingLift.com; lead photo by Milo\u0161\u00a0\u0160ar\u010dev)<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Several years ago, I tested the neck extensor strength of a world-class speed-skater and a world-class hammer thrower. Using a weight representing 85 percent of their maximum for a single repetition, the hammer thrower completed three reps and the speed-skater did 200 reps! Yes, 200 reps! Again, these athletes were testing the strength of the same muscles using the same exercise. Would these results also suggest that all the muscles in the speed skater\u2019s body are tonic, and all the muscles in the hammer thrower are phasic? Obviously not \u2013 their performance on this test with these specific muscles was a result of
their training.<\/p>\n

A general guideline to develop maximum strength is to use reps within the 1-6 range. Because using strict percentages of 1-repetition maximums may not fall within this range, I advise letting the reps determine the load. This guideline also applies to other types of strength, such as relative strength and strength-endurance.<\/p>\n

With all due respect to Dr. Janda, the words phasic <\/i>and tonic <\/i>do not sufficiently describe how muscles function and should not be used to determine program design.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Understanding Phasic and Tonic Muscles A closer look at the science of fast and slow-twitch fibers in program design By Strength Sensei CP Publication Date: 2004 Vladimir Janda was born in Czechoslovakia in 1928 and contracted polio at the age of 15, leaving him unable to walk for two years. He recovered and became a […]<\/p>\n","protected":false},"author":10,"featured_media":2822,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"yoast_head":"\nUnderstanding Phasic and Tonic Muscles - Strength Sensei Inc<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/strengthsenseiinc.com\/2020\/09\/07\/understanding-phasic-and-tonic-muscles\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Understanding Phasic and Tonic Muscles - Strength Sensei Inc\" \/>\n<meta property=\"og:description\" content=\"Understanding Phasic and Tonic Muscles A closer look at the science of fast and slow-twitch fibers in program design By Strength Sensei CP Publication Date: 2004 Vladimir Janda was born in Czechoslovakia in 1928 and contracted polio at the age of 15, leaving him unable to walk for two years. 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