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The New York Times tapped the expertise of SMU’s Peter Weyand, an expert in human locomotion, in an Aug. 8 article “As Debate Goes On, Amputee Will Break Barrier”
Journalist Juliet Macur examines the controversy surrounding double-amputee sprinter Oscar Pistorius. Preparing now for the 2012 London Olympics, the 24-year-old South African once again is under the spotlight for his controversial carbon-fiber prosthetic legs that attach just below his knees.
Weyand is widely quoted in the press for his expertise on human speed. He led a team of scientists who are experts in biomechanics and physiology in conducting experiments on Oscar Pistorius and the mechanics of his racing ability. Pistorius has made headlines worldwide trying to qualify for races against runners with intact limbs, including the Olympics.
Weyand is an SMU associate professor of applied physiology and biomechanics in the Annette Caldwell Simmons School of Education & Human Development.
EXCERPT:
By Juliet Macur
The New York Times
The moment that the sprinter Oscar Pistorius had hoped for and trained for finally came Monday when he was named to South Africa’s team for the track and field world championships, which will make him the first amputee to compete at the event.“If I manage to make it through the heats, I would be thrilled.” Oscar Pistorius, on qualifying for the world championships.
Pistorius, a four-time Paralympic champion, will race in the 400 meters and the 4×400 relay against men who have two natural legs, while he uses prosthetics. Last month, he ran fast enough to meet the Olympic qualifying standard, and now he will blaze a trail.
“This will be the highest-profile and most prestigious able-bodied event which I have ever competed in, and I will face the highest caliber of athletes from across the planet,” Pistorius, 24, said in a statement sent Monday by his agent, Peet van Zyl. “If I manage to make it through the heats, I would be thrilled.”
The road to the world championships could just lead to a berth in the 2012 London Games for Pistorius, who said he had never considered himself disabled and had never considered the world championships or Olympics out of his reach.
Even so, that road to making the team for this month’s world championships, which will begin Aug. 27 in Daegu, South Korea, has not been smooth for Pistorius — and his road to the Olympics may not be any smoother.
Born without his fibulas, the long bones that span from the knees to the ankles, Pistorius relies on carbon-fiber prosthetic limbs to propel him around the track in times comparable to some of the world’s top runners. And therein remains the question that has been the crux of a continuing debate: do those high-tech legs give him an unfair advantage?
In 2008, the International Association of Athletics Federations, track and field’s governing body, thought so. It ruled that Pistorius was ineligible to compete in the worlds because his prosthetic legs made it easier for him to run than competitors with legs made of flesh and bone. But he appealed to the Court of Arbitration for Sport and won in May 2008.
The court, though, provided no definitive answer to the underlying question of whether Pistorius was naturally fast or just fast because of his prosthetic legs. It said that the I.A.A.F. failed to meet its burden of proving that Pistorius’s legs provided him with an overall advantage or disadvantage.
To further complicate the issue, the court made it clear that the case could be reopened, saying that advances in technology and a different testing regime might prove that Pistorious’s legs did, in fact, give him an edge.
“There was a disagreement among the scientists, but I feel that the conclusion was overwhelming that he’s a lot faster with the legs than someone is without them,” said Peter Weyand, an associate professor of applied physiology and biomechanics at Southern Methodist University and one of seven scientists who in 2008 conducted physiological and biomechanical tests on Pistorius at Rice University.
SMU is a nationally ranked private university in Dallas founded 100 years ago. Today, SMU enrolls nearly 11,000 students who benefit from the academic opportunities and international reach of seven degree-granting schools. For more information see www.smu.edu.
SMU has an uplink facility located on campus for live TV, radio, or online interviews. To speak with an SMU expert or book an SMU guest in the studio, call SMU News & Communications at 214-768-7650.
ESPN: The Olympics loom for Oscar Pistorius
- Post author By Margaret Allen
- Post date August 5, 2011
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Sports journalist Johnette Howard quotes SMU’s Peter Weyand, an expert in human locomotion, in an Aug. 5 article “The Olympics loom for Oscar Pistorius”
Howard examines the accomplishments of double-amputee sprinter Oscar Pistorius and the controversy that has dogged his racing career. Preparing now for the 2012 London Olympics, the 24-year-old South African once again is under the spotlight for his controversial carbon-fiber prosthetic legs that attach just below his knees.
Weyand is widely quoted in the press for his expertise on human speed. He led a team of scientists who are experts in biomechanics and physiology in conducting experiments on Oscar Pistorius and the mechanics of his racing ability. Pistorius has made headlines worldwide trying to qualify for races against runners with intact limbs, including the Olympics.
Weyand is an SMU associate professor of applied physiology and biomechanics in the Annette Caldwell Simmons School of Education & Human Development.
EXCERPT:
By Johnette Howard
ESPN
You hope the murmuring and arguing that has already restarted now that Oscar Pistorius has done the remarkable, the extraordinary, the heretofore unfathomable will not drag him down between now and the 2012 London Olympics. Because what Pistorius, a double-amputee sprinter, was able to do on a muggy night in Lignano, Italy, on July 19 is the sort of mind-blowing achievement that shouldn’t be unfairly derailed by this unsettled debate. He thought he had already navigated it once, but now it’s likely to trail the 24-year-old South African all the way to next year’s Olympic Summer Games. [ … ]Perhaps the most contentious assertion, Peter Weyand, an associate professor of applied physiology and biomechanics at Southern Methodist University, and Matthew Bundle, now an assistant professor at the University of Montana, have argued that, among other things, Pistorius enjoys as much as a 10 to 12 second advantage in a 400-meter race using his prosthetic legs, for reasons Weyand says have to do with the frequency of how quickly Pistorius is able reposition his lightweight legs as he strides; the force he exerts; the longer length of time each of his prosthetic feet remains on the ground; and reduced ground force requirements to attain the same sprinting speeds.
“You can collect more data, but the answers about Oscar Pistorius are in, in my opinion,” Weyand said in a phone interview Tuesday. “He is able to run faster than many of his competitors even though he does not hit the ground as hard.”
To which Hugh Herr of MIT, another member of the Pistorius research group, retorts, “It baffles me why Weyand and Bundle continue to say that.”
Herr, an associate professor and director of MIT’s biomechatronics research group, argues, “You really have to have rigorous, peer-reviewed, published, carefully examined scientific evidence. [Weyand-Bundle’s argument] is simply a calculation, nearly a back-of-the-envelope calculation. To label it as a scientific study is very misleading. ??? Their calculation was never published in a peer-reviewed paper. It was in the point/counterpoint article, which was not rigorously peer-reviewed.”
So the debate about Pistorius lives on. But how much does it still matter?
Other than perhaps inhibiting his training — as the IAAF controversy and CAS fight did back in 2008, when he admitted it dragged him down emotionally (“It’s been completely on this kid’s back to prove everything himself so he can run,” Mullins says) — the griping needn’t stop him.
“As far as we are concerned, the CAS decision is final and the case is closed, as long as he continues to compete on the same prosthetic legs the CAS ruled on,” insisted Jeffrey Kessler, the New York-based attorney who took on Pistorius’ case on a pro bono basis and represents the National Basketball Player’s Association and NFL Players Association in their labor negotiations. “I spoke to Oscar on the phone the other day and I’ve committed to him that when he runs in London, I will be there. To me, this is about the rights of the disabled. He is one of the most inspiring people I’ve ever met in my life.”
Weyand has been careful to stress that he admires Pistorius, too, and finds the man and his accomplishments “absolutely extraordinary.” But Weyand considers himself just a scientist doing his job, and added that nothing he has asserted, “should in any way diminish what Oscar has done.”
SMU is a nationally ranked private university in Dallas founded 100 years ago. Today, SMU enrolls nearly 11,000 students who benefit from the academic opportunities and international reach of seven degree-granting schools. For more information see www.smu.edu.
SMU has an uplink facility located on campus for live TV, radio, or online interviews. To speak with an SMU expert or book an SMU guest in the studio, call SMU News & Communications at 214-768-7650.
Panic attacks that seem to strike sufferers out-of-the-blue are not without warning after all, according to new research.
A study based on 24-hour monitoring of panic sufferers while they went about their daily activities captured panic attacks as they happened and discovered waves of significant physiological instability for at least 60 minutes before patients’ awareness of the panic attacks, said psychologist Alicia E. Meuret at Southern Methodist University in Dallas.
In a rare study in which patients were monitored around-the-clock, portable recorders captured changes in respiration, heart rate and other bodily functions, said Meuret, lead researcher on the study.
The new findings suggest sufferers of panic attacks may be highly sensitive to — but unaware of — an accumulating pattern of subtle physiological instabilities that occur before an attack, Meuret said.
Monitoring data also showed patients were hyperventilating on a chronic basis.
Simulated panic sufferer and monitoring equipment. (Photo: SMU) |
“The results were just amazing,” Meuret said. “We found that in this hour preceding naturally occurring panic attacks, there was a lot of physiological instability. These significant physiological instabilities were not present during other times when the patient wasn’t about to have a panic attack.”
It is notable that patients reported the attacks as unexpected, lacking awareness of either the coming attack or their changing physiology.
“The changes don’t seem to enter the patient’s awareness,” Meuret said. “What they report is what happens at the end of the 60 minutes — that they’re having an out-of-the blue panic attack with a lot of intense physical sensations. We had expected the majority of the physiological activation would occur during and following the onset of the panic attack. But what we actually found was very little additional physiological change at that time.”
Unexpected attacks have been a mystery; little research to explain them
The diagnostic standard for psychological disorders, the DSM-IV, defines panic attacks as either expected or unexpected.
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Those that are expected, or cued, occur when a patient feels an attack is likely, such as in closed spaces, while driving or in a crowded place.
“But in an unexpected panic attack, the patient reports the attack to occur out-of-the-blue,” Meuret said. “They would say they were sitting watching TV when they were suddenly hit by a rush of symptoms, and there wasn’t anything that made it predictable.”
To sufferers and researchers alike, the attacks are a mystery.
Change-point analysis uncovered physiological instabilities one hour before attacks
Meuret and her colleagues discovered the significant physiological instabilities using change-point analysis, a statistical method that searches for points when changes occur in a “process” over time.
“This analysis allowed us to search through patients’ physiological data recorded in the hour before the onset of their panic attacks to determine if there were points at which the signals changed significantly,” said psychologist David Rosenfield of SMU, lead statistician on the project.
The study is significant not only for panic disorder, but also for other medical problems where symptoms and events have seemingly “out-of-the blue” onsets, such as seizures, strokes and even manic episodes.
“I think this method and study will ultimately help detect what’s going on before these unexpected events and help determine how to prevent them,” Meuret said. “If we know what’s happening before the event, it’s easier to treat it.”
Meuret, an assistant professor in the SMU Department of Psychology, reported the results in the journal Biological Psychiatry in the article “Do Unexpected Panic Attacks Occur Spontaneously?” Rosenfield is an associate professor in SMU’s Department of Psychology.
A multi-disciplinary collaboration, other authors on the study were psychologist Thomas Ritz, SMU Department of Psychology; psychologist Frank H. Wilhelm, University of Salzburg, Austria; electrical engineer Enlu Zhou, University of Illinois at Urbana-Champaign; and psychologist Ansgar Conrad and psychiatrist Walton T. Roth, both of Stanford University.
Meuret discusses the research in an SMU Research youtube video.
Subtle physical changes impact panic sufferers more severely
People with panic disorder probably won’t be surprised by the results, Meuret said.
By definition, the majority of the 13 symptoms of panic attack are physiological: shortness of breath, heart racing, dizziness, chest pain, sweating, hot flashes, trembling, choking, nausea and numbness. Only three are psychological: feeling of unreality, fear of losing control and fear of dying.
“Most patients obviously feel that there must be something going on physically,” Meuret said. “They worry they’re having a heart attack, suffocating or going to pass out. Our data doesn’t indicate there’s something inherently wrong with them physically, neither when they are at rest nor during panic. The fluctuations that we discovered are not extreme; they are subtle. But they seem to build up and may result in a notion that something catastrophic is going on.”
Notably, the researchers found that patients’ carbon dioxide, or C02, levels were in an abnormally low range, indicating the patients were chronically hyperventilating. These levels rose significantly shortly before panic onset and correlated with reports of anxiety, fear of dying and chest pain.
“It has been speculated, but never verified with data recordings in daily life, that increases in CO2 cause feelings of suffocation and can be panic triggers,” Meuret said.
Fanny pack monitor tracked physiological changes before, during and after attacks
To capture the physiological data, 43 patients wore the monitoring devices for 24 hours on two separate occasions. The researchers collected 1,960 hours of ambulatory monitoring data, including 13 unexpected panic attacks.
Participants, all of whom suffer from panic disorder, were each outfitted with an array of electrodes and sensors attached to various parts of their bodies.
The ambulatory monitoring device was toted in a small waist pack the patients wore. Also included was a portable capnometer to measure CO2 collected from exhaled breath. The physiological responses were recorded continuously as digital data in a time series.
Each monitoring pack included a “panic button.” Patients were instructed to press the button if they had an attack and to write down their symptoms. By triggering the panic button, patients inserted a marker into the time-series data, marking the moment the attack began.
The sensors measured eight physiological indices, including changes in respiration, such as how deep, fast or irregular people were breathing; cardiac activity; and evidence of sweating.
Data analysis found strikingly significant changes in the hour before attacks
From the nearly 2,000 hours of data, the change-point analysis program allowed the researchers to slice out 70-minute periods around each of the 13 panic attacks — from one hour before onset until 10 minutes after the attacks began.
For each index, the program checked for any significant change in the signal that remained stable over a specified period of time.
Those results were collapsed across all 13 panic attacks, with minute-by-minute averages. The information was then compared to a 70-minute control period randomly chosen during non-panic periods.
“We found 15 subtle but significant changes an hour before the onset of the panic attacks that followed a logical physiological pattern. These weren’t present during the non-panic period,” Meuret said.
“Why they occurred, we don’t know. We also can’t say necessarily they were causal for the panic attacks. But the changes were strikingly and significantly different to what was observed in the non-panic control period,” she said.
Findings prompt look at “panic” definition and treatment
The study’s results invite a reconsideration of the DSM diagnostic definition that separates “expected” from “unexpected” attacks, Meuret said.
Also, the study might explain why medication or interventions aimed at normalizing respiration for treating panic are effective, she said. Medication generally buffers arousal, keeping it low and regular, thereby preventing unexpected panic attacks.
For psychological treatments such as Cognitive Behavior Therapy (CBT), the results are more challenging. CBT requires a patient to focus on examining thoughts to prevent an attack.
“But a patient can’t work on something they don’t know is going to happen,” Meuret said.
New methodology can be universalized to other unexpected medical problems
The study’s use of change-point analysis can be applied to other medical issues. Traditional statistics are ineffective at analyzing such data, Meuret said, because they look only at level differences at pre-determined times and won’t find a signal for an unknown point.
“This study is a step toward more understanding and hopefully opening more doors for research on medical events that are difficult to predict. The hope is that we can then translate these findings into new therapies,” she said.
The research was funded by the National Institutes of Mental Health, Department of Veterans Affairs and the Beth and Russell Siegelman Foundation. — Margaret Allen
SMU is a nationally ranked private university in Dallas founded 100 years ago. Today, SMU enrolls nearly 11,000 students who benefit from the academic opportunities and international reach of seven degree-granting schools. For more information see www.smu.edu.
SMU has an uplink facility located on campus for live TV, radio, or online interviews. To speak with an SMU expert or book an SMU guest in the studio, call SMU News & Communications at 214-768-7650.
Science Daily: Scientists Find Simple Way to Produce Graphene
- Post author By Margaret Allen
- Post date June 28, 2011
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The online science news site Science Daily has covered the research of SMU Chemistry Department Professor John A. Maguire.
The June 21 article “Scientists Find Simple Way to Produce Graphene” reports the news that Maguire and a team lead by scientists from Northern Illinois University have discovered a simple method for producing high yields of graphene, a highly touted carbon nanostructure that some believe could replace silicon as the technological fabric of the future.
Excerpt:
By Science DailyScientists at Northern Illinois University say they have discovered a simple method for producing high yields of graphene, a highly touted carbon nanostructure that some believe could replace silicon as the technological fabric of the future.
The focus of intense scientific research in recent years, graphene is a two-dimensional material, composed of a single layer of carbon atoms arranged in a hexagonal lattice. It is the strongest material ever measured and has other remarkable qualities, including high electron mobility, a property that elevates its potential for use in high-speed nano-scale devices of the future.
In a June communication to the Journal of Materials Chemistry, the NIU researchers report on a new method that converts carbon dioxide directly into few-layer graphene (less than 10 atoms in thickness) by burning pure magnesium metal in dry ice.
“It is scientifically proven that burning magnesium metal in carbon dioxide produces carbon, but the formation of this carbon with few-layer graphene as the major product has neither been identified nor proven as such until our current report,” said Narayan Hosmane, a professor of chemistry and biochemistry who leads the NIU research group.
Oil & Gas: Geothermal in the oil field, the next emerging market
- Post author By Margaret Allen
- Post date June 22, 2011
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One of the petroleum industry’s major sources for industry news has covered the emergence of geothermal energy from existing oil and gas fields as a potential source of power generation.
The June 20 article “Geothermal in the oil field, the next emerging market” provides context for the emerging technology that is making geothermal production possible. The article cites SMU’s annual geothermal conference as a source of more information about geothermal production.
The SMU Geothermal Laboratory hosted its fifth international conference dedicated to “Geothermal Energy Utilization Associated with Oil & Gas Development” in mid-June on the SMU campus.
EXCERPT:
Oil & Gas Magazine
The petroleum industry is at a crossroads. A perfect storm of declining reserves, aging oilfields, increasing costs for exploration, operating, and decommissioning, volatile oil prices, and the uptick trending of “green” energy — it has never been more important to make the most out of existing reserves, assets and infrastructure.
Geothermal energy is an emerging worldwide energy market. Geothermal often gets overlooked in a world of PV, CSP, wind and hydro; however, geothermal offers more reliability (average 95 per cent capacity factor), lower carbon emissions and lower maintenance costs compared to these more “glamorous” renewable energy sources.
Geothermal has some major barriers to entry to the mainstream energy market. The largest barriers include the high-initial capital costs related to drilling and constructing new geothermal wells, long payback periods, and the risk associated with unknown formation performance when drilling in a new area.
Using proven technology, expertise and reservoir data from the petroleum industry, this unlikely partnership can provide a springboard for the geothermal industry to enter the mainstream renewable energy market, while at the same time benefiting the petroleum industry. If the initial capital costs for drilling geothermal wells could be reduced by utilizing existing oil field infrastructure, while also minimizing risk by using existing oilfield data, the barriers to entry for geothermal suddenly come tumbling down.
Recent advancements in energy conversion technologies and Enhanced Geothermal Systems (EGS) technology have made incorporating geothermal in the oil field a viable and exciting emerging-energy market. In 2009, the American Recovery and Reinvestment Act (ARRA) funded several projects demonstrating electricity generation from geothermal fluids, produced from active, abandoned, or marginal oil and gas wells. Federal tax incentives, the Department of Treasury Cash Grant and the DOE Loan Guarantee program combined with aggressive state renewable portfolio goals are expected to drive growth in the geothermal industry in the near term.