Showing posts with label Michelle Livne. Show all posts
Showing posts with label Michelle Livne. Show all posts

February 23, 2018

How Do Sports Affect Our Mind?

Sports are well-known to be good for our physical health. Many studies have confirmed the effectiveness of regular physical activity in the primary and secondary prevention of several diseases like cardiovascular disease, diabetes, cancer, hypertension, obesity, osteoporosis and premature death. Exercising appears to have a direct relationship with many aspects of our health status, i.e., exercising more leads to further improvement in physical well-being [1]. The next question is: what is the effect of sports on our mind?
 
Source: http://bit.ly/1U7mgoT
Physical activity helps our brain in many ways. It decreases anxiety and depression, protects from loss of cognitive function in people with a risk of Alzheimer's and conserves cognitive brain functions across one's lifespan. Likewise, it helps healthy people by improving sleep, reducing the risk of Alzheimer's and other neurodegenerative diseases [2,3,4,5].
Excercise Improves Mood Instantly
Our mood also benefits from physical activity. Regular exercise was verified to improve mental well-being in the general population. It increases our quality of life by enhancing self-esteem, improving mood and reducing stress [2]. Not only do sports help us in the long run, but they were shown to improve our mood almost instantaneously. Most likely, if you do 20 sit-ups right now, you will feel happier immediately (once you catch your breath) [6].
So the next time you go for a run, know that you are not only taking care of your body but also of your brain!

[1] Warburton et al., CMAJ, 2006
[2] Fox, Public Health Nutr, 1999
[3] Lautenschlager et al., JAMA, 2008
[4] Scarmeas et al., JAMA, 2009
[5] Kramer and Erickson, Trends Cogn Sci, 2007
[6] Yeung, J Psychosom Res, 1996

By Michelle Livne, PhD Student AG Sobesky

January 14, 2017

Does Money Make You Happy?

We have been talking about New Year's resolutions lately, among them were "Exercise more often", "Eat Healthier and Diet" and "Quit Smoking". Today we focus on another common resolution "Spend Less, Save More". But is this really a good idea? Will it make me happy to not spend the money but to save it?

via flickr
We live in a world where happiness is advertised to us as reachable by material things. Be it a big house, a new car or a vacation in the Caribbean, we are promised that we are only one step away from greater happiness by simply buying things. There is no doubt that money controls our life to a great extent. But does money truly make us happy?


Money Matters – to a Certain Degree
The relationship between money and happiness has fascinated researchers for many years. Fifteen years ago, it was shown that there is a high correlation between the general wealth of nations and the mean reports of subjective well-being (SWB), the standard measure for happiness. However, within each nation, there were only small correlations between the two (see also "The Happiest (Or Wealthiest?) Countries On Earth" on page 14). Moreover, an increase in individual income did not have a clear effect on SWB and recent economic growth was followed by only a small rise in SWB [1]. The study concluded that more money increases SWB when it means avoiding poverty (as the difference in SWB between developing countries and developed countries suggests) but income does not change the SWB levels over the long term.
Other recent studies have examined happiness levels with regard to SWB showing that a high income improves our evaluation of life in the rational sense, but not SWB in the emotional sense. In other words, money makes you think you feel better but it actually does not [2]. Finally, a fascinating study examined the happiness levels of lottery winners and accident victims along time. Surprisingly, after a certain period of time had passed (a year), both groups returned to their original baseline happiness levels [3].
Overall, it seems that money plays a relatively minor role in happiness – it is important to a certain degree, to provide for the basic necessities in life, but once these necessities are met, money will have almost no effect on our happiness levels.

Culture and the Money-Happiness Relationship
To understand the relationship between income and happiness, the consumption norms of a society seem to be essential. In a culture where ostensibly money plays such a large role in defining our social class, it may have a prominent effect on our happiness, and not necessarily in the right direction. People who value money highly and are materialistic tend to be less happy [4-6]. This is due to motives of social comparison, seeking power, showing off and an urge to overcome self-doubt.
These bad side effects of materialism were not only found in people with a materialistic personality, but also in people who were simply exposed enough to a consumption-promoting environment [7]. So whether money itself makes us happy or not, it is clear beyond doubt that pursuing it definitely makes us feel less happy. 

If Not Money -  Then What Does Make Us Happy?
Autonomy seems to be part of the answer. A meta-analysis with data from 63 countries showed that individualism was consistently a better predictor than wealth for happiness [8]. Many other studies emphasize the positive effect of gratitude on an individual's happiness [9]. Grateful thinking and gratitude expression improve mood, promote savoring the good things, boosts our self-esteem, and helps strengthen social bonds and relationships.
Leading a healthy lifestyle with regard to food, physical activity, and sleep also has an effect on our happiness. Bad foods (covered in our last issue on Nutrition and Neuroscience) has a bad effect on our mood [10], while engaging in physical activity enhances self-esteem, improves our mood, and reduces anxiety [11]. Sleep also has an important role for our happiness [12] - dreaming in particular - is an important mechanism to deal with painful memories [13]. In addition, sleep deprivation decreases our job satisfaction [14].  

Tips for Seeking Happiness
Overall, it seems that money is a bad focus point to achieve happiness. If you want to enhance your happiness, you should concentrate on the following:
  • Do not set money as your top priority
  • Express gratitude and remember to be grateful especially for the things you may take for granted
  • Lead a healthy lifestyle – move more, eat healthy, and SLEEP!
[1] Diener et al., Social Indicators Research, 2001
[2] Kahneman and Deaton, PNAS, 2010
[3] Brickman et al., J Pers Soc Psychol, 1978
[4] Srivastava et al., J Pers Soc Psychol, 2001
[5] Kasser et al., Motiv Emot, 2014
[6] Nickerson et al., Psychol Sci, 2003
[7] Bauer et al., Psychol Sci, 2012
[8] Fischer and Boer., J Pers Soc Psychol, 2011
[9] Watkins et al., Soc Behav Pers, 2003
[10] Golomb et al., PLOS One, 2012
[11] Fox, Public Health Nutr, 1999
[12] Griffith and Rosbash, Nat Neurosci, 2008
[13] Science Daily, UC Berkeley
[14] Science Daily, ESRC

by Michelle Livne, PhD Student AG Sobesky

January 02, 2017

Does Physical Activity Improve Learning?

Happy New Year everyone! Did you make any New Year's resolutions? What about exercising more often? This classic New Year's resolution might not only benefit your waistline, but also your brain!
 
As a teenager in high school, I spent most of my sports classes running away from the ball. Like me,
Source: Dirk Hansen via Wikimedia Commons
many of us have wondered why we deserved this torture in the shape of sports classes. When I came to think about this question later, my main answer was the value of physical activity for healthy development. However, more and more evidence has emerged suggesting that the importance of sports goes far beyond mere physical education.
The relationship between physical activity and learning was first studied in rodents. In several experiments in mice and rats, running was found to enhance neurogenesis and improve spatial learning performance. The experimental findings suggested that physical activity can regulate hippocampal neurogenesis, synaptic plasticity and learning [1,2,3]. From this, it soon became clear that physical activity has a positive effect on learning abilities in rodents. But how?

What's the Link Between Brains and Brawn?
The mechanism behind the positive effect in rodents was related to several effects in the hippocampus. Exercising was found to cause alterations in the hippocampal bound protein kinase C (PKC) activity [1]. Rats that had exercised showed enhanced hippocampal high affinity choline uptake (HACU) and muscarinic receptor binding. This enhancement in the hippocampal cholinergic functioning appeared to improve the learning performance [3]. Another effect of physical activity consisted in the induction of fibroblast growth factor 2 (FGF) and its mRNA in the hippocampus. These results demonstrate that exercise regulates FGF-2 expression and suggests that growth factors are likely mediators of the positive effects of exercise on the brain [4].
The effect of physical activity on learning abilities in humans is yet under controversy. Both results from studies with animal and cross-sectional studies with humans were consistent about the positive effect of aerobic exercise on cognitive functions. However, results from studies with humans cannot be interpreted that easily since individuals who select to exercise or not may differ on other variables that could influence cognitive performance. Therefore, in order to correctly test the hypothesis with humans, long intervention studies are necessary [5].
Nevertheless, indirect evidence for the positive effect of sports on learning was demonstrated in many studies. A meta-analysis from 2010 of over 30,000 patients showed that subjects who performed physical activity showed better cognitive abilities and were protected against cognitive decline [6]. Furthermore, several interventional studies in children showed improvement in different cognitive tests when engaging in physical activity, comparing to control groups who didn’t [7,8,9]. 

What Sport Should I Start?
Aerobic training in particular seems to have a unique effect on learning compared with other types of sport. Immediately after intensive physical exercise, learning abilities are facilitated and brain-derived neurotrophic factor (BDNF) catecholamines levels are elevated, implying they mediate the way physical exercise improves learning [10]. Along with the positive effect on learning, aerobic training was found to improve cognitive function and protect against brain tissue loss in elderly people [11,12]. Therefore, aerobic training seems to have an especially beneficial effect on our cognitive functions and learning.
To summarize, more and more findings support the positive effect of sports on learning abilities. Through several physiological mechanisms, involving neurotrophic factors and neurogenesis in the hippocampus, exercising mediates and enhances learning abilities and protects against cognitive decline and brain tissue loss in old age.


[1] Fordyce and Wehner, Brain Res, 1993
[2] Praag et al., Proc Natl Acad Sci USA, 1999
[3] Fordyce and Farrar, Behav Brain Res, 1991
[4] Gomez-Pinilla et al., Brain Res, 1997
[5] Dustman et al., J Aging Phys Act, 1994
[6] Sofi et al., J Intern Med, 2010
[7] Kamijo et al., Dev Sci, 2011
[8] Hilman et al., Neuroscience, 2009
[9] Pesce et al., Ment Health Phys Act, 2009
[10] Winter et al., Neurobiol Learn Mem, 2007
[11] Colcombe et al., J Gerontol A Biol Sci Med Sci, 2002
[12] Fabre et al., Int J Sports Med, 2002


by Michelle Livne, PhD Student AG Sobesky