background preloader

Circadian rhythm

Circadian rhythm
Some features of the human circadian (24-hour) biological clock History[edit] The earliest recorded account of a circadian process dates from the 4th century B.C.E., when Androsthenes, a ship captain serving under Alexander the Great, described diurnal leaf movements of the tamarind tree.[1] The observation of a circadian or diurnal process in humans is mentioned in Chinese medical texts dated to around the 13th century, including the Noon and Midnight Manual and the Mnemonic Rhyme to Aid in the Selection of Acu-points According to the Diurnal Cycle, the Day of the Month and the Season of the Year.[2] The first recorded observation of an endogenous circadian oscillation was by the French scientist Jean-Jacques d'Ortous de Mairan in 1729. The term circadian was coined by Franz Halberg in the 1950s.[10] Criteria[edit] To be called circadian, a biological rhythm must meet these three general criteria:[11] Origin[edit] The simplest known circadian clock is that of the prokaryotic cyanobacteria. Related:  Vibrations Through Health

Nerd Fitness: Helping You Lose Weight, Get Stronger, Live Better. I received an email a few months back from a NF reader that made me smile: “I am going back to square one. I noticed the only habit that I changed and stuck with was drinking tons of water. Have you ever started playing a game and get a few hours in and go “man I wish I knew these controls/tips from the beginning”? I’m restarting my journey now that I have a better idea of the controls.” This resonated with me, because when I first played EverQuest (similar to World of Warcraft), the first character I created was terrible. When I started again playing as a new character, I FLEW through the first 30 levels: I understood the controls, how the game worked, and what needed to get done; it was much easier the second time through! The same is true for any boss battle you first encounter in any game. Getting in shape is no different. Each time you start over, you’re getting closer to that point of making things stick.

3D Printed Cast Speeds Bone Recovery Using Ultrasound A new prototype brings together 3D printing, room to breathe and ultrasound pulses to create a cast that is not only comfortable and stylish to wear but is expected to speed healing relative to existing options. However, despite success in vitro and promising results from clinical studies LIPUS has not been widely adopted, partly because the measured benefit has varied across trials, in some cases appearing too small to justify the effort. Where LIPUS currently involves a daily session at a medical clinic, Deniz Karasahin added a portable ultrasound generator to the cast. "For single 20 minute daily sessions this system promises to reduce the healing process up to 38% and increase the heal rate up to 80% in non-union fractures," he has claimed, using figures from the top of the ranges produced in trials of LIPUS without changing cast technology. Photo Gallery

The Open Organisation Of Lockpickers :: Meetings This is a repository of the most up-to-date versions of Deviant's lock diagrams and animations. Seen in all of the TOOOL educational materials and slide decks, these files are all released under the Creative Commons license. You are free to use any of them for non-commercial purposes, as long as they are properly attributed and the same freedom for others is maintained in all derivative works. Please note that these diagrams have evolved and developed over time. While Deviant is still proud of the older versions of his images, if you still have copies of legacy material they should all be replaced with the latest versions available here. Lock Basics and Mechanical Operation How pin tumblers are arranged and how locks operate (or fail to) with conventional keys Introduction to Lockpicking Overview of why lock picking is possible and the use of basic pick tools Manipulation-Resistant Locks Spool pins, mushroom pins, and other ways of increasing security Diagrams of Bumping Attacks

How To Take Photos From the Edge of Space For $150 MIT students build a high-altitude, photo-snapping balloon using off-the-shelf components Icarus Touches the Edge: A $150 view of space 1337arts Scientists and students alike have previously launched low-budget balloons that rise to the upper reaches of Earth's atmosphere, snapping unbelievable photos from near-space. But MIT's Icarus team managed the same feat using only off-the-shelf items, and for a measly cost of $150. Here's how they did it. The MIT students list everything that they used to assemble the launch vehicle, including a prepaid Motorola i290 phone with GPS, a cell phone charger and disposable hand warmers to keep everything operable at the cold high altitudes. "We bought a AA-battery cell phone charger to sustain the phone’s power over the duration of the flight, and we used Energizer lithium batteries (rated to operate at temperatures are low as -40F) to power both this charger as well as our camera," the Icarus team wrote on their website. [via 1337arts ]

Irregular sleep–wake rhythm Irregular sleep–wake rhythm is a rare form of circadian rhythm sleep disorder. It is characterized by numerous naps throughout the 24-hour period, no main nighttime sleep episode and irregularity from day to day.[1] Sufferers have no pattern of when they are awake or asleep, may have poor quality sleep, and often may be very sleepy while they are awake. The total time asleep per 24 hours is normal for the person's age.[2][3][4] The disorder is serious—an invisible disability. Nomenclature[edit] The current formally correct name of the disorder is Circadian Rhythm Sleep Disorder: Irregular Sleep Wake Rhythm Type.[5] This disorder has been referred to by many other terms, including: Irregular Sleep Wake Pattern,[6] irregular sleep wake syndrome,[7] Irregular Sleep Wake Rhythm,[8] Irregular Sleep Wake Cycle,[9] Irregular Sleep Wake Schedule[10] and Irregular Sleep Wake Disorder (ISWD).[4] Sometimes the words sleep and wake are hyphenated (sleep–wake). Causes[edit] Diagnosis[edit]

Simple Science Fitness. Burn Fat & Build Muscle for Healthy Humans. Cooking Cooking is mandatory for a healthy lifestyle. Low quality fast food and pre-cooked packages have replaced the time, effort, and skill required for cooking. Even though going to a restaurant requires time and effort, the trade-off for grocery shopping, preparation, and cooking is that your diet, wallet, and health will buy you additional years of enjoyable living. Pound for pound, buying food in bulk from places such as Costco and Trader Joe's is significantly cheaper than fast food in the long run. Not only is cooking a useful and gratifying skill, you can also make leftovers to save time. Your Kitchen By creating your own meals, most of your fresh foods and leftovers will be stocked in the fridge and freezer, with less stored in the pantry. To save time, a rice cooker, slow cooker, and blender are useful kitchen appliances. Combining Foods The Power of Spices Most sauces and dressings are high in energy dense sugar and seed oils. Improving Palatability and Health On A Budget

| 5 Common Food Items That Could Save Your Life From the Team at Green Med Info… Some of the most powerful medicines on the planet are masquerading around as foods and spices. While they do not lend themselves to being patented, nor will multi-billion dollar human clinical trials ever be funded to prove them efficacious, they have been used since time immemorial to both nourish our bodies, and to prevent and treat disease. So valued were these in ancient times that they were worth their weight in gold, and entire civilizations either rose to great power or collapsed as a result of their relationship to them. What is even more amazing is that many of these “plant allies” are found growing in our backyards, and often sitting there in our refrigerators and spice racks, neglected and under appreciated. In fact, many of us use these daily unaware that this is why we don’t get sick as often as those who do not incorporate them into their diet. This amazing list underscores how important it is to keep a supply of garlic close by! 2.) Sources:

Inside the Ghost Ships of the Mothball Fleet | Beyond the Photos For decades, dozens of forgotten Navy and merchant ships have been corroding in Suisun Bay, 30 miles northeast of San Francisco. These historic vessels—the Mothball Fleet—served their country in four wars: WWII, the Korean War, the Vietnam War, and Desert Storm. After a decade of impasse, the ghost fleet is slowly dwindling as the ships are towed out one-by-one for scrapping. About 15 retired ships are already gone; by 2017, the entire fleet will be just a memory. Over a two-year period, several close friends and I gained unprecedented access to the decaying ships, spending several days at a time photographing, documenting, and even sleeping aboard them—often in the luxury of the captain’s quarters. Sneaking on-board required months of planning and coordination, and it involved taking significant risks. History and Current State These ghost ships, part of the National Defense Reserve Fleet (NDRF) overseen by the U.S. Guns on the deck of the USS Iowa. Ticking Environmental Time Bombs

Chronobiology Chronobiology is a field of biology that examines periodic (cyclic) phenomena in living organisms and their adaptation to solar- and lunar-related rhythms.[1] These cycles are known as biological rhythms. Chronobiology comes from the ancient Greek χρόνος (chrónos, meaning "time"), and biology, which pertains to the study, or science, of life. The related terms chronomics and chronome have been used in some cases to describe either the molecular mechanisms involved in chronobiological phenomena or the more quantitative aspects of chronobiology, particularly where comparison of cycles between organisms is required. Chronobiological studies include but are not limited to comparative anatomy, physiology, genetics, molecular biology and behavior of organisms within biological rhythms mechanics.[1] Other aspects include development, reproduction, ecology and evolution. Description[edit] The circadian rhythm can further be broken down into routine cycles during the 24-hour day:[2] History[edit]

Accessible Fitness & Active Lifestyle Exercise Guides - Photos and Instructions for Over 500 Exercises We have included step by step instructional guides for over 500 different resistance training exercises. This database of exercises covers everything from weight training, kettlebell, medicine ball, elastic bands, exercise ball, Pilates and stretching movements. Each instructional page will show you how to properly perform a specific resistance training exercise. Abs | Back | Biceps | Butt | Calves | Chest | Forearms Hamstrings | Neck | Quadriceps | Shoulders | Traps | Triceps Elastic Bands Exercises | Kettlebell Exercises | Medicine Ball Exercises Exercise Ball | Core Exercises | Pilates Exercises | Stretching Exercises

True Facts Facts - interesting, provocative, well-seasoned One out of ten children in Europe are conceived on an IKEA bed. Antarctica is the only continent without reptiles or snakes. An eagle can kill a young deer and fly away with it. In the Caribbean there are oysters that can climb trees. Intelligent people have more zinc and copper in their hair. The world's youngest parents were 8 and 9 and lived in China in 1910. When George Lucas was mixing the American Graffiti soundtrack, he numbered the reels of film starting with an R and numbered the dialog starting with a D. The youngest pope was 11 years old. Mark Twain didn't graduate from elementary school. Proportional to their weight, men are stronger than horses. Pilgrims ate popcorn at the first Thanksgiving dinner. They have square watermelons in Japan - they stack better. Iceland consumes more Coca-Cola per capita than any other nation. Heinz Catsup leaving the bottle travels at 25 miles per year. It is possible to lead a cow upstairs but not downstairs.

Circadian rhythm sleep disorder Circadian rhythm sleep disorders (CRSD) are a family of sleep disorders affecting, among other things, the timing of sleep. People with circadian rhythm sleep disorders are unable to sleep and wake at the times required for normal work, school, and social needs. They are generally able to get enough sleep if allowed to sleep and wake at the times dictated by their body clocks. Unless they also have another sleep disorder, their sleep is of normal quality. Humans, like most animals and plants, have biological rhythms, known as circadian rhythms, which are controlled by a biological clock and work on a daily time scale. Sleep researcher Yaron Dagan states that "[t]hese disorders can lead to harmful psychological and functional difficulties and are often misdiagnosed and incorrectly treated due to the fact that doctors are unaware of their existence Types of circadian rhythm sleep disorders[edit] Extrinsic type[edit] Intrinsic type[edit] Normal circadian rhythms[edit] See also[edit]

Related: