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PCNSE Palo Alto Networks Certified Security Engineer (PCNSE) PAN-OS 8.0

PCNSE - Palo Alto Networks Certified Network Security Engineer

The test covers the following topics:
Deploy and Configure
Configuration Troubleshooting
Core Concepts

The test covers the following topics:

Next-Generation Security Platform and Architecture
Firewall Configuration
Security and NAT Policies
URL Filtering
Monitoring and Reporting
Security Best Practices

Palo Alto Networks Certified Security Engineer (PCNSE) PAN-OS 8.0
Palo-Alto Certified outline
Killexams : Palo-Alto Certified outline - BingNews Search results Killexams : Palo-Alto Certified outline - BingNews Killexams : Big Money Little Kids and a Grand Experiment </head> <body id="readabilityBody" readability="488"> <h3>Can AltSchool, the edtech startup backed by $174 million from Mark Zuckerberg, Peter Thiel and Laurene Powell Jobs, save itself from failure?</h3> <p><img src=""/><br/></p> <p>"We might not be around in five years," says Max Ventilla, AltSchool's 38-year-old cofounder and CEO, as the two publicists minding our interview cringe. "Don't put that in your article," says AltSchool's communications director, Maggie Quale, while a young woman from Rubenstein, the giant New York-based corporate PR firm, sits in awkward silence.</p> <p>We're two intense hours into an interview in a stuffy, glass-paned meeting room in a former 24 Hour Fitness that is now home to one of AltSchool's two small private schools in San Francisco for grades pre-K through 8. Ventilla, who left Google to launch AltSchool in 2013, has spent $30 million annually over the last several years while trying to find steady footing for his for-profit education startup, which runs four schools; the other two are in New York City.</p> <p>AltSchool's 240 students, including two of Ventilla's children--Leonardo, 5, and Sabine, 7--are guinea pigs for a software platform that AltSchool is attempting to sell to hundreds of schools both private and public. So far it has 28 customers. Revenue in 2018 was $7 million. "Our whole strategy is to spend more than we make," he says. Since software is expensive to develop and cheap to distribute, the losses, he believes, will turn into steep profits once AltSchool refines its product and lands enough customers.</p> <p>But as Ventilla admits when he lets his guard down, reaching profitability will be quite a stretch. The story of how AltSchool arrived at this point--burning cash in a failed attempt to create a profitable private-school network and fighting to sell an expensive edtech product in a crowded field--shows that the best intentions, an impressive career in tech and an excess of Silicon Valley money and enthusiasm don't easily translate into success in a tradition-bound marketplace where budgets are tight.</p> <p>Ventilla, wearing jeans, scuffed black leather slip-ons, a faded polo shirt with AltSchool's logo and a black fleece jacket, has been able to hemorrhage cash because, as he has it, "I'm good at telling AltSchool's story and I'm good at raising money early." So good that he has raised $174 million in venture capital at a $440 million valuation, according to PitchBook, more than almost any other startup working on K-12 education. That sum includes a personal investment of more than $15 million from Mark Zuckerberg and his wife, Priscilla Chan. Zuckerberg initiated two hours-long one-on-one meetings with Ventilla in late 2014, when AltSchool was only 18 months old. "He's very detail-oriented, and he likes to drill down," Ventilla says of Zuckerberg.</p> <p>It's easy to see how Ventilla would appeal to tech billionaires and their investment vehicles, including Laurene Powell Jobs' Emerson Collective, Pierre Omidyar's Omidyar Network, Peter Thiel's Founders Fund and Marc Andreessen's Andreessen Horowitz, all of which have become AltSchool backers on the strength of his high-minded pitch. "Our mission has always been to make the best education the most available," he says. "Students shouldn't just be cogs in a wheel. They should be agents of their own goals." (None of the five billionaires responded to requests for comment.)</p> <p>Before starting AltSchool, Ventilla says, he read two dozen books on education and emerged a fan of Sir Ken Robinson, a British TED Talk speaker known for lamenting the dearth of creativity in early education, and Angela Duckworth, a psychologist and the winner of a MacArthur "genius" grant who has written about the need for children to cultivate "grit." The quality of primary and secondary education in America, stuck in an industrial-age model, has been in steady decline for the last century, says Ventilla, citing the most latest Programme for International Student Assessment (PISA) results, a worldwide test of reading, math and science ability in which U.S. 15-year-olds ranked 38th out of 71 countries. "The factory model in a non-factory world disengages kids," he says. AltSchool's solution: "Foster in children the development of an internal compass so that as things are changing around them more rapidly, they can always reorient."</p> <p>To do this, AltSchool adopted an educational philosophy backed by the Bill &amp; Melinda Gates Foundation and the Emerson Collective and by Zuckerberg in his much-publicized letter to his oldest daughter, Maxima, born in 2015, a year after his meeting with Ventilla. Known variously as "personalized learning," "learner-centric learning" and "competency-based learning," the philosophy argues against the traditional model of an all-knowing teacher dictating from the head of the class, sometimes called the "sage on the stage" approach, where students are expected to progress as a group. Instead children, together with teachers, set individual goals, explore areas that most interest them within a defined curriculum and trade lots of feedback along the way.</p> <p>The technology piece of personalized learning is the most controversial. No one wants students to sit in front of screens all day doing math drills with software driven by artificial intelligence. At AltSchool, Ventilla proposed developing a software platform that would make it efficient and easy for teachers to customize assignments, assess performance and communicate with administrators and parents. He calls AltSchool's private schools "lab schools," where teachers try various approaches on students while working closely with a staff of engineers, many of whom were hired away from Google, Apple and Facebook.</p> <p>But he learned quickly that education is a much tougher nut to crack than search engines. Early on, he had a big plan to expand into Chicago, and he was working on an idea to franchise a network of AltSchools across the country. But in 2016, he ditched both possibilities. Altogether he started nine schools in San Francisco, Palo Alto and New York. By the end of 2018, he had closed five of them, including the one in Palo Alto, with its 62 students. (Ventilla says most students from the shuttered AltSchools in San Francisco and New York transferred to other campuses.) With tuition starting at $26,000, which is expensive but still lower than many Bay Area private schools, none of the locations were paying for themselves.</p> <p>Ventilla says schools tested different models. One San Francisco location had a single room and 32 students in grades 6 through 8, a setup that died when the school closed. He says he made it clear to parents that the schools were experimental and might remain open for only a short time. "We were doing a lot of iterating and learning," he says.</p> <p>He also abandoned experiments like setting up four cameras per classroom to film students interacting with teachers. He had read a Gates-funded study that recommended videotaping. Teachers used the cameras for two years before Ventilla put a kibosh on the project. "It didn't really make sense when you thought about the cost to maintain the system," he says.</p> <p>Other bigger expenses made even less sense. Because none of the properties had been designed as schools, unexpected problems surfaced, says Carolyn Wilson, AltSchool's former director of education. "What ate our lunch more than anything was doing real estate retrofits," she says. At one of the schools in San Francisco, the toilets kept backing up. None of the locations had playgrounds or gyms, so AltSchool took children to city parks. In one San Francisco park frequented by the homeless, human feces presented a problem. To ensure students' safety, AltSchool hired Mike Ginty, the former head of global security at Uber. (Today, AltSchool has worked out secure arrangements with a combination of public parks and private facilities, like a YMCA in Manhattan.)</p> <p>In 2016 Ventilla decided the most cost-effective way to realize his vision was to put the schools on the back burner and focus on the software platform and selling it to customers he calls "partners." Those schools would give feedback to his engineers, who could further hone the product. He is betting that he will find massive numbers of school leaders ready to embrace personalized learning and pay AltSchool's steep fees. But a half-dozen other companies, including Schoology, Moodle, Blackboard and Canvas, offer so-called learning management systems that also claim to facilitate personalized learning. Canvas, based in Salt Lake City, bills itself as the market leader with thousands of customers, and has both a free product and a customized version for an annual cost per student of $10 or less.</p> <p>By contrast, AltSchool's charges work out to $100 to $150 per student per year. "From what I've heard talking to administrators and educators, $150 per kid feels like a prohibitive price point," says Tony Wan, managing editor of EdSurge, a media company in Burlingame, California, that covers educational technology. "Who can afford that?"</p> <p>Ventilla brushes off the naysayers. "The name of the game is always scale," he says, predicting that AltSchool's software price will fall as low as $50 per student. AltSchool has also been building open education-curriculum software into its product, including math and English lessons that meet state standards, and its software gives automated prompts to teachers that can Excellerate their performance. "We're not just selling software," he says. "We're selling a replacement for the curriculum schools have to buy. We're selling professional development. Those are big numbers for schools, many times what AltSchool is charging now."</p> <p>Ventilla himself was not educated this way. The son of Hungarian immigrants, he grew up with his sister and parents in a one-bedroom apartment on Manhattan's Upper East Side. His father, a filmmaker in Hungary, scraped by as a sculptor and illustrator. His mother taught business courses to Columbia University undergrads and was the family breadwinner. A gifted child, he won a scholarship to Buckley, a private Manhattan boys' school with a traditional approach where Donald Trump Jr. had been a student. He went on to Andover and Yale on scholarship and was admitted to the Yale School of Management in a program for exceptional Yale College grads, called Silver Scholars, which paid the first year of tuition.</p> <p>In 2000, while an undergrad, he started a data-mining software company with some buddies from Andover and Yale, raising $1 million before selling the company 18 months later for an undisclosed sum that he says gave his investors a good return. After business school and a gig working for a classified advertising firm in Europe, he landed at Google in a unit that worked on business operations and strategy.</p> <p>But he stayed only a year before starting a social search engine company called Aardvark in 2007, funded with $10 million in venture capital. Less than three years in, he sold the company to Google for $50 million, making his stake, which Forbes estimates at more than 10%, worth upwards of $5 million. "It was totally life-changing money for me," he says. He bought a house in San Francisco's Twin Peaks neighborhood with his wife, Jenny Stefanotti, a UC Berkeley and Harvard grad he had met during his first stint at Google. Before starting AltSchool, he returned to Google for three years, where he worked in a small group that developed the Google Plus social network, before heading up the company's personalization team.</p> <p>By the winter of 2012, he and Stefanotti already had Sabine, who was one and a half, and son Leonardo was on the way. They started searching for preschools and were appalled by what they found. "There were a handful of good preschools, and each one of them was insanely competitive to get into," he says. "The implication was that if you didn't get your kid into the right preschool, they were going to be penniless and alone by the time they were 30."</p> <p>Itching to start a new venture, he threw himself into researching the kind of school where he imagined Sabine would thrive. Within months he quit Google and started raising cash. In the deck for his Series A funding round, he showed a picture of himself lying on a bed, memorizing to Sabine and baby Leonardo, a Gandhi quote across the top of the screen: "Be the change you want to see in the world."</p> <p>Though Ventilla's business plan was no more than a vague outline, he was a Silicon Valley insider, and investors bought in. "He was talking about a shift from a lecture-based model of education to a learner-centric model," says First Round Capital partner Josh Kopelman, who sits on AltSchool's board. "That made total sense to us."</p> <p>Inside AltSchool's Manhattan middle school, in an office building on the busy corner of Fifth Avenue and 14th Street, there are more books, papers, pens and pencils than computers, though students are each assigned a Chromebook, which they use off and on throughout the day. In a humanities class, a black-clad teacher with close-cropped hair, Jaqi Ruiz-Garcia, is conducting a Socratic discussion with her eight seventh and eighth graders. They have all read the same texts: Ta-Nehisi Coates' Between the World and Me, printed on dead trees, and a photocopied James Baldwin essay. Students refer to essays they have written with pencils in old-fashioned notebooks, and Ruiz-Garcia has a stuffed yellow caterpillar that she passes around the classroom to each student who wants to speak.</p> <p>"People need to be more aware that we're not a perfect country," says one girl.</p> <p>"What are some ways we can build bridges in society?" asks Ruiz-Garcia.</p> <p>"There was more time in this country--250 years--when people were enslaved than when they were free," responds a girl with tight braids. "People who make $15 an hour are still enslaved."</p> <p>"I heard a quote on Instagram: 'Vote like your life depends on it,'�‰" says another student.</p> <p>As the yellow caterpillar makes its way around the group, three kids are staring into space.</p> <p>After class Ruiz-Garcia, a five-year AltSchool veteran, explains that she is making the unit learner-centric by expecting students to do the memorizing at their own pace. She is also using a feature of AltSchool's software called a "playlist," which allows teachers to customize "cards," AltSchool's word for assignments. One card directs a student to practice paraphrasing. The teacher-facing side of the platform requires Ruiz-Garcia to assess students on up to seven skills, including summarizing and analyzing information and connecting the past to the present. None of it suggests a new education system transformed by technology.</p> <p>At AltSchool's Fort Mason campus in San Francisco, five-year-old Leonardo Ventilla's teacher Dina Hamaoui has written out his goals on paper worksheets. All AltSchool students set social and emotional goals in addition to academic goals. One of Leonardo's sheets says, "I will be able to talk about what zone my brain and body are in and use strategies to shift between them." When he finishes a worksheet, he takes it to a white easel where he photographs it with an iPad and uses AltSchool's "capture" feature to upload it to AltSchool's software platform, where it can be viewed by his teacher, who can email it to his parents.</p> <p>Among 11 parents interviewed for this story, some recommended by AltSchool and others not, many are happy and even like the idea that their offspring were being used to test AltSchool's product. "We went into this with our eyes wide open," says Gamal Walker, a parent in New York who works in finance. His two daughters are thriving, he says. He also likes that AltSchool is certified as a B Corporation, a designation that obligates the company to put the interest of its stakeholders and community ahead of profits.</p> <p>Others are less pleased. One mother, whose son is now in public school, says that AltSchool wrongly assessed his memorizing level and he spent a year making no progress. "We were just guinea pigs, supplying Max with data," she says. (Since she works in the tech industry, she doesn't want to be quoted by name.) "He was supposed to change the world with his edtech product, but the teachers couldn't even teach writing."</p> <p>"We had really mediocre educators using technology as a crutch," says a father who transferred his child to a different private school after two years at AltSchool. (He runs a startup and also doesn't want his name in print.) "We learned that it's almost impossible to really customize the learning experience for each kid."</p> <p>Ventilla declines to comment on the experiences of individual students and families.</p> <p>two of altschool's public partner school districts are in Paramount and Arcadia, California, outside Los Angeles. Paramount, a predominantly Latino district where almost all 4,700 students in its biggest high school qualify for free lunch, is running a pilot using AltSchool's software at a new high school with a STEM focus called Odyssey. Opened in August, Odyssey has 138 ninth graders, with plans to ramp up to four grades and 550 students. Enthusiastic kids show projects they are working on in a "maker space" classroom, where they can use a 3-D printer. Student Honey Robinson, dressed up as Michael Jackson with a glove on one hand, delivers the polished elevator pitch she composed in a course that walks students through the steps for finding an internship, which they then work part-time for eight weeks of the school year.</p> <p>Odyssey seems to be off to a promising start, but Ryan D. Smith, Paramount's assistant superintendent, says there are as yet no plans to adopt AltSchool's software throughout the district. "In a new school, you have an opportunity to do things completely different from the very beginning," he says. "At our old schools, we'd have a lot of other work to do before we could have a more personalized learning environment for our students."</p> <p>Which is where Ventilla's plans hit a roadblock. Most of AltSchool's current partners are small private schools. At the eight public districts that are customers, all are running pilots, and only two have plans to move beyond that stage. Ventilla is betting they will ramp up. "If the 250,000 total students in our partner districts use AltSchool, we could bring down our price point and start to turn a profit," he says. But if they don't, which seems more likely, it's tough to imagine AltSchool surviving.</p> <p>Ventilla and his team are competing in a field crowded with companies trying to find digital solutions to one of the world's toughest challenges--how to Excellerate K-12 education in America. So far there have been some monumental failures and only moderate successes. In 2015, News Corp wrote down nearly $400 million after investing more than $1 billion in Amplify, an edtech division that failed to find enough buyers for the hardware and curriculum software it developed for the K-12 market. (Now majority-owned by the Emerson Collective, Laurene Powell Jobs' impact-investing firm, Amplify is finally approaching profitability through sales of a K-8 science curriculum that combines books, kits and software.)</p> <p>Edmodo, an online social network for classrooms founded in 2008 in San Mateo, California, raised more than $100 million and spread to 400,000 schools in nearly 200 countries. But it never came up with a business model for its free product and wound up losing $19.5 million in 2017 on revenue of just $1 million. In April 2018, China's NetDragon, which makes online games, bought the company for $137.5 million.</p> <p>At its lab schools, AltSchool's remaining students seem to be performing well. Two to three times a year, they take a math, memorizing and language-usage test called MAP, which assesses progress. Last year the test measured the students' growth in academic progress at 34% above the national average. They have also placed into well-regarded private high schools, including Lick-Wilmerding in San Francisco and the College Preparatory School in Oakland.</p> <p>But the company will last only if it can boost sales of its software. "That's the big risk of a startup," says Ventilla.</p> <p>"I'll be at it until I can't do it anymore. There are lots of entrepreneurs who won't go into education because it's just not worth it," he explains. "If they do something well, they get very little praise or help... . I could do a lot of things that would pay me a lot more money and bring me a lot more fame."</p> <p>Why do it, then? "I'm doing this because I think it's really important in the world, and I don't think there are an abundance of others who have the resources and can pull it off."</p> <p><strong>Head of the Class</strong></p> <p>Thanks to a roster of A-plus investors, AltSchool has built one of edtech's biggest war chests. Meet the smart money taking the big risk.</p> <p><strong>MARK ZUCKERBERG</strong><br/>Chan Zuckerberg Initiative<br/>Zuckerberg and wife Priscilla Chan have invested more than $300 million in edtech companies, nonprofits and school districts. Zuck wrote to his infant daughter Maxima in 2015: "You'll have technology that understands how you learn best and where you need to focus."</p> <p><strong>PETER THIEL</strong><br/>Founders Fund<br/>The Stanford alum is known for hating traditional education, and his VC fund invests in an array of education companies, including adaptive-learning software makers Declara and Knewton. "I think one of the downsides of too much education is that you get the most brainwashed."</p> <p><strong>LAURENE POWELL JOBS</strong><br/>Emerson Collective<br/>Emerson has pledged $130�‰million to 19 public schools across the country. "School was the thing that really worked for me... . I know it in my core that, without that, I never would have had the opportunities that I have in my life."</p> <p><strong>MARC ANDREESSEN</strong><br/>Andreessen Horowitz<br/>Among the companies Andreessen's VC firm is backing: Wonderschool, a network of home-based child-care centers, and MOOC provider Udacity. "The classroom of the future is going to be much more software-powered than it is today."</p> <p><strong>PIERRE OMIDYAR</strong><br/>Omidyar Network<br/>The eBay founder's impact-investing firm supports nearly 100 education ventures, from teachers'-instruction content platform LearnZillion to free instructional-video producer Khan Academy. "You'll fail at some things--that's a learning experience that you need so that you can take that on to the next experience."</p> <p>EDTECH</p> </body> </description> <pubDate>Thu, 19 May 2022 11:19:00 -0500</pubDate> <dc:format>text/html</dc:format> <dc:identifier></dc:identifier> </item> <item> <title>Killexams : A Controlled Pilot Study of Stress Management Training of Elderly Patients With Congestive Heart Failure

Research Design and Methods

The initial study demo consisted of 13 men and 20 women with an average age of 66±9 years. Thirteen participants were middle-class Anglo-Americans, with one Asian American woman, and were invited to participate by the nurse at a local cardiac rehabilitation facility. Nineteen participants were inner city, low socioeconomic status African American, Asian American, or Latino patients, and were invited to participate by their cardiologists.

Subjects had been diagnosed as having NYHA class I to very early class III CHF at least 3 months previously and had been on a stable medication regimen for at least 1 month. A cardiologist evaluated each patient's medical file and certified each participant as eligible for the study. Stanford University's Institutional Review Board approved this project.

Participants were assigned to either of two treatment groups or to the wait-listed control group through incomplete randomization. Full randomization was attempted, but because only one class was held per location, four participants in the treatment group could not make the training sessions and became control group participants. Subsequently, five control group members were assigned to the treatment groups. Control group members were invited to attend a 1-day training at the completion of the intervention.

All participants received the same 10 hours of training offered during eight weekly 75-minute sessions spread over 10 weeks. The two treatment groups followed the same topical outline that was taught by one of the authors (Frederic Luskin), a licensed psychotherapist. The training was primarily didactic in nature, with an emphasis on guided practice of the techniques. A limited amount of time was set aside for participant sharing of personal experience. After each session, participants were given practice assignments for the week.

The stress management techniques taught were Freeze-Frame, Heart Lock-in, Appreciation and Care vs. Overcare. Freeze-Frame is the basic stress management technique and starts with the conscious shifting of attention from a stressful experience to the area around one's heart. After taking a few slow, deep breaths into the area around the heart, one's attention is drawn to a visualization or memory of a positive emotion, such as care or love. Then the feeling generated by that positive emotion is held in the area around the heart. Heart Lock-in is an extended Freeze-Frame, while Appreciation is learning to focus attention on positive experiences. Care is distinguished from Overcare. Overcare is defined as the tendency to want something or someone so much that the extra effort and/or anxiety obscures the positive experience of care and leads to distress.

The class outline was as follows:

  1. Orientation and class overview. Review research on the effectiveness of practice of Freeze-Frame. Guided practice in Freeze-Frame.

  2. Review of research on effectiveness of stress management in cardiovascular disease. Review of what stress does to the body. Review of Freeze-Frame. Guided practice in Heart Lock-in.

  3. Discussion of stress management practice as a form of complementary medicine. Discussion of importance of self-care. Presentation of concept of Appreciation. Guided practice in Freeze-Frame.

  4. Discussion of secondary gain (behavior that on the surface appears unproductive has personally relevant reason for continuation). Discussion of the difficulty in changing patterns of response. Brainstorming for suggestions. Guided practice in Heart Lock-in.

  5. Practice in thinking of ways to include Freeze-Frame in daily life. Teaching of other simple stress management tips, such as deep breathing and taking a moment before making decisions. Guided practice in Heart Lock-in.

  6. Discussion of Care vs. Overcare and implications for stress management. Presentation of the concept of finding the Care rather than the Overcare in each situation one encounters. Guided practice in Heart Lock-in.

  7. Presentation of mental health as partly the choice of how one responds. Emphasis on decisions that primarily manifest either Care or Overcare. Teaching, through class examples, that suffering is the result of Overcare crowding out Care. Guided practice in Heart Lock-in.

  8. Review of course material. Reminders for future practice, creation of an ongoing practice routine that does not vary, and emphasis on continued practice. Participant feedback on training.

At the conclusion of each class period, participants were given homework practice suggestions. Beginning with the second session, each participant was asked to do one Heart Lock-in per day for 15 minutes. Starting with session 4, each participant was asked to do two Heart Lock-ins per day. In addition, starting with the first session, participants were asked to do at least three Freeze-Frames per day, as well as look for opportunities during the day to practice Freeze-Frame.

All measures were administered 1-2 weeks before the training began (pretest) and 1-2 weeks after the training ended (post-test).

  1. Geriatric Depression Scale: measures participant's level of negative affect.[19]

  2. Perceived Stress Scale: measures participant's perceived level of stress and ability to cope.[20]

  3. Life Orientation Test: measures subject's level of positive expectation or optimism.[21]

  4. State Trait Anxiety Inventory: measures stable or dispositional expression of anxiety.[22]

  5. Medical Outcome Survey Questions 3 and 9: two of the multi-item self-report questions were evaluated that ask participants to rate their ability to complete basic activities and the quality of their emotional experience.[23]

  6. Minnesota Living with Heart Failure: a quality of life measure evaluating the degree to which CHF interferes with the completion of normal life tasks.[24]

  7. Self-report physical fitness: participants are asked to rate their confidence in their physical ability.[25]

  8. Six-minute walk: participants are measured to see how far they can walk in 6 minutes.

  9. Systolic blood pressure: pressure was taken three times with 5-minute intervals and the average pressure was utilized for comparison.

  10. Heart rate variability (HRV): evaluates changes in autonomic tone through 24-hour Holter monitoring, with use of the following indices[26]:

Time domain:

  • Mean heart rate in beats per minute

  • SDNN: standard deviation of the normal-to-normal (NN) interval in milliseconds; measures overall HRV

  • SDNN index: the mean of the 5-minute standard deviation of NN intervals calculated over 24 hours; measures overall HRV

  • RMS-SD: the square root of the mean squared differences of successive NN intervals; a measure of vagal tone

  • 24-Hour triangle index: total number of all NN intervals divided by the maximum NN interval; a measure of overall HRV frequency domain

  • Low frequency: variance in the 0.04-0.15-Hz range; a measure of both parasympathetic and sympathetic tone

  • High frequency: variance in the 0.15-4.00-Hz range; a measure of vagal tone

  • 5-Minute total power: variance of all 5-minute intervals; a measure of overall HRV

  • Total power: variance of all NN intervals; a measure of overall HRV

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