Doing Math With Better Posture Improves Performance, Study Finds

The research has implications for other areas of performance too.

If you’ve ever felt like a deer in the headlights before taking a math test or speaking before a large group of people, you could benefit from a simple change in posture. As part of a new study by researchers at San Francisco State University, 125 college students were tested to see how well they could perform simple math — subtracting 7 from 843 sequentially for 15 seconds — while either slumped over or sitting up straight with shoulders back and relaxed. Fifty-six percent of the students reported finding it easier to perform the math in the upright position.

“For people who are anxious about math, posture makes a giant difference,” said Professor of Health Education Erik Peper. “The slumped-over position shuts them down and their brains do not work as well. They cannot think as clearly.” Before the study began, students filled out an anonymous questionnaire asking them to rate their anxiety levels while taking exams and performing math; they also described any physical symptoms of stress they experienced during test taking.

According to co-author Associate Professor of Health Education Richard Harvey, slumping over is a defensive posture that can trigger old negative memories in the body and brain. While the students without math anxiety did not report as great a benefit from better posture, they did find that doing math while slumped over was somewhat more difficult.

Peper and Harvey say these findings about body position can help people prepare for many different types of performance under stress, not just math tests. Athletes, musicians and public speakers can all benefit from better posture prior to and during their performance. “You have a choice,” said Peper. “It’s about using an empowered position to optimize your focus.”

That empowerment could be particularly helpful to students facing the challenge called “stereotype threat,” said Lauren Mason, one of the paper’s authors and a recent SF State graduate. A first-generation college student, Mason can identify with such students, who experience fear and insecurity because of a belief by others — which can become internalized — that they won’t do as well at math. Mason said she has benefitted personally from using a more empowered posture before taking difficult tests, including math. She believes that adopting a more confident posture could help other first-generation students as well as women entering science and math, who often battle stereotype threat, too.

“I always felt insecure about my math abilities even though I excelled at other subjects,” said Mason, who helped design the experiment in the study. “You build a relationship with [math] so early — as early as elementary school. You can carry that negative self-talk throughout your life, impacting your perception of yourself.”

Mason said the study results demonstrate a simple way to improve many aspects of life, especially when stress is involved: “The way we carry ourselves and interact in space influences not only how others perceive us but also how we perceive ourselves.”

Even Minor Dehydration Can Make Thinking More Difficult

If climate change leads to increased temperatures throughout the world, people will sweat off water faster, meaning that they will become dehydrated more quickly. This has clear implications for possibly reducing the average level of decision making among humans.

If you’re finding it hard to get your thoughts straight, dehydration could be to blame. An analysis of previous research has found a link between dehydration and poor performance in tasks that need serious focus or advanced mental processing.

While we know that staying hydrated is good for us for all kinds of reasons, this new meta-study was designed to take a closer look at exactly which brain processes might be affected and at what level of dehydration.

It turns out that at just a 2 percent level of body mass loss due to dehydration – so losing about a litre of water through sweat – the mental imbalance starts. That underlines how crucial it is for us to keep up our water intake, and how damaging it might be to the mental agility we all rely on if we don’t.

“We find that when people are mildly dehydrated they really don’t do as well on tasks that require complex processing or on tasks that require a lot of their attention,” lead researcher Mindy Millard-Stafford, from the Georgia Institute of Technology, told Allison Aubrey at NPR.

Millard-Stafford and her colleague Matthew Wittbrodt looked at 33 previous studies linking dehydration with mental performance. In total, the studies covered a total of 413 individuals experiencing between 1 percent and 6 percent of body mass loss through dehydration.

That 2 percent point seems to be the tipping point when it comes to staying mentally sharp. According to the experts, it would maybe take an hour’s hike to get to that level.

What’s more, it’s a level of dehydration that we might not actually notice through triggers like increased thirst: so mental performance could decline even when we don’t feel like we need to take on any water.

The analysis backs up previous research suggesting that dehydration impairs some mental processes more than others, with attention, executive function, and motor coordination particularly hard hit. Lower-level tasks like reaction time aren’t as badly affected, the meta-study shows.

While it’s different for every individual, experts recommend that women get up to 2.7 litres or 95 fluid ounces (11.5 cups) of water every day, and men up to 3.7 litres or 130 fluid ounces (15.5 cups).

The body as a whole is 60 percent water, which it leverages for jobs like transporting nutrients around the body and lubricating our eyeballs.

When there isn’t enough water available – it’s regularly lost through sweating and urination – these vital functions start to break down. We become thirsty, start to feel nauseous, and become more likely to feel exhausted.