{"id":6515,"date":"2023-04-07T18:34:05","date_gmt":"2023-04-07T18:34:05","guid":{"rendered":"https:\/\/liveyourlifept.com\/blog\/?p=6515"},"modified":"2023-04-07T18:34:07","modified_gmt":"2023-04-07T18:34:07","slug":"shop-talk-swedish-scientists-say-skiing-delays-symptom-of-parkinsons-disease","status":"publish","type":"post","link":"https:\/\/liveyourlifept.com\/blog\/2023\/04\/07\/shop-talk-swedish-scientists-say-skiing-delays-symptom-of-parkinsons-disease\/","title":{"rendered":"Shop Talk- Swedish Scientists Say Skiing Delays Symptom of Parkinson\u2019s Disease"},"content":{"rendered":"\n<p>Over the holiday break, I had time to kick back and watch some movies and TV shows. As usual, the workshop gathered to watch&nbsp;<em>Elf<\/em>&nbsp;and&nbsp;<em>The Santa Clause.&nbsp;<\/em>Then I downloaded season 1 of&nbsp;<em>Yellowstone<\/em>&nbsp;to see what everyone has been talking about. I also watched&nbsp;<em>Still Alice<\/em>, a story about a professor with early-onset Alzheimer&#8217;s disease. In one scene, a doctor explains that cognitive decline can be rapid once the condition is diagnosed, especially in people with highly developed intellect. He explains that high cognitive ability makes it possible to compensate for cognitive decline and mask early symptoms. Eventually, the ability to compensate is outstretched by the neuro-degenerative effects of the disease, and a rapid decline in function ensues.<\/p>\n\n\n\n<p>The movie reminded me of a paper I read before the break. It dealt with Parkinson\u2019s disease and had a similar message, suggesting that physical activity delays the clinical manifestations of Parkinson\u2019s disease. Today\u2019s issue of Shop Talk discusses that paper and serves as an entr\u00e9e into upcoming issues that also deal with Parkinson\u2019s disease.<\/p>\n\n\n\n<p>For those approaching this topic for the first time, here is a little background.<\/p>\n\n\n\n<p>Parkinson\u2019s disease is bad. It\u2019s a progressive neurological disorder with no known cure. It occurs when cells in the brain stop making dopamine, a chemical neurotransmitter important for movement, motivation, and pleasure. As dopamine levels decline, people with Parkinson\u2019s disease develop tremors and muscular rigidity. They move more slowly and less accurately than normal and may experience pain, fatigue, sleep disturbances, urogenital dysfunction, and memory problems.<\/p>\n\n\n\n<p>Physical activity reduces the risk of Parkinson\u2019s disease, but we don\u2019t know why. It could be due to&nbsp;<strong>reverse causation<\/strong>, a phenomenon wherein people with Parkinson\u2019s disease reduce their activity prior to diagnosis. Another possibility is&nbsp;<strong>neuroprotection<\/strong>&nbsp;wherein exercise protects dopamine-producing cells from damage and death. Others have proposed a&nbsp;<strong>motor reserve<\/strong>&nbsp;hypothesis that argues that people who are physically fit can sustain a larger amount of brain damage before the onset of overt symptoms.<\/p>\n\n\n\n<p>In their 2020 paper published in&nbsp;the <em>Journal of Parkinson\u2019s Disease<\/em>, Tomas Olsson and his colleagues report evidence in favor of the&nbsp;<strong>motor reserve<\/strong>&nbsp;hypothesis. Their work was done in Sweden and has a uniquely Swedish vibe. The study involved nearly 200,000 cross-country skiers who participated in the Vasaloppet \u2013 the largest long-distance ski race in the world. Race participation served as a proxy for physical activity because the authors reasoned that people participating in a 30, 45, or 90 km ski race were physically well-trained. (I tend to agree.) Using the Swedish National Patient Registry, they compared the skiers to a sample of nearly 200,000 non-skiers from the general population. Both groups were followed for 20 years. The authors tallied the number of people in each group who were diagnosed with Parkinson\u2019s disease and noted the age at which the diagnosis was made.<\/p>\n\n\n\n<p>Until the age of 49, skiers were significantly less likely than non-skiers to be diagnosed with Parkinson\u2019s disease. However, once the skiers hit 50, they were as likely as non-skiers to have a Parkinson\u2019s diagnosis. These observations are consistent with a&nbsp;<strong>motor reserve<\/strong>&nbsp;hypothesis, wherein individuals who exercise experience as much brain pathology as the general population but take longer to manifest clinical signs of disease.<\/p>\n\n\n\n<p>What\u2019s the upshot? To ski or not to ski? I say ski, and the Swedes probably agree. It won\u2019t protect your brain cells, but you\u2019ll feel better for longer. And what else is there to do in the 97 days of January in the Northern hemisphere? Oh right\u2026 TV and movies.<\/p>\n\n\n\n<p>That\u2019s all for now. We\u2019ll be back soon with more on Parkinson\u2019s disease. Meanwhile, you can dig into this topic by checking out the resources below. If you like what we\u2019re doing, please forward this issue to a friend and check out our&nbsp;<a href=\"https:\/\/www.buymeacoffee.com\/ptworkshop\/posts\" target=\"_blank\" rel=\"noreferrer noopener\">archives<\/a>. If you have a moment, tell us what you&nbsp;<a href=\"https:\/\/www.buymeacoffee.com\/ptworkshop\/posts\" target=\"_blank\" rel=\"noreferrer noopener\">think<\/a>. We love hearing from you.<\/p>\n\n\n\n<p><strong>Further Reading<\/strong><\/p>\n\n\n\n<p>1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read the whole&nbsp;<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/31609700\/\" target=\"_blank\" rel=\"noreferrer noopener\">article<\/a>&nbsp;on skiing and Parkinson\u2019s disease.<\/p>\n\n\n\n<p>Olsson TT, Svensson M, H\u00e5llmarker U, James S, Deierborg T. Delayed Clinical Manifestation of Parkinson&#8217;s Disease Among Physically Active: Do Participants in a Long-Distance Ski Race Have a Motor Reserve?&nbsp;<em>J Parkinsons Dis<\/em>. 2020;10(1):267-274. doi: 10.3233\/JPD-191762. Erratum in:&nbsp;<em>J Parkinsons Dis<\/em>. 2021;11(1):373. PMID: 31609700; PMCID: PMC7029367.<\/p>\n\n\n\n<p>2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Here are some links to&nbsp;<a href=\"https:\/\/www.imdb.com\/title\/tt0319343\/?ref_=fn_al_tt_1\" target=\"_blank\" rel=\"noreferrer noopener\">Elf<\/a>,&nbsp;<a href=\"https:\/\/www.imdb.com\/title\/tt0111070\/\" target=\"_blank\" rel=\"noreferrer noopener\">The Santa Clause<\/a>,&nbsp;<a href=\"https:\/\/www.imdb.com\/title\/tt3316960\/\" target=\"_blank\" rel=\"noreferrer noopener\">Still Alice<\/a>, and&nbsp;<a href=\"https:\/\/www.imdb.com\/title\/tt4236770\/\" target=\"_blank\" rel=\"noreferrer noopener\">Yellowstone<\/a>.<\/p>\n\n\n\n<p>3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For an introduction to Parkinson\u2019s disease, check out&nbsp;<a href=\"https:\/\/www.michaeljfox.org\/parkinsons-101\" target=\"_blank\" rel=\"noreferrer noopener\">Parkinson\u2019s 101<\/a>&nbsp;at the Michael J. Fox Foundation.<\/p>\n\n\n\n<p>4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For the evidence nerds, here are some thoughts on study design.<\/p>\n\n\n\n<p>The Olsson article is a self-described&nbsp;<strong>prospective observational<\/strong>&nbsp;study. Prospective means that data were collected after the study was designed. Observational means that the researchers did not intervene; they just watched.<\/p>\n\n\n\n<p>We might also categorize the study as a&nbsp;<strong>non-inception cohort design<\/strong>&nbsp;where individuals with and without a&nbsp;<strong>risk factor<\/strong>&nbsp;of interest (i.e., physical activity) were identified and followed to see who developed the outcome of interest (i.e., Parkinson\u2019s disease). It might seem strange to call physical activity a risk factor, but that\u2019s the term we use to describe any prognostic indicator regardless of whether it is thought to be detrimental or beneficial.<\/p>\n\n\n\n<p>Observational studies have several strengths. Because researchers need not intervene, it is feasible to examine large samples like the 400,000 Swedes described here. We need large samples to detect small effects and generalize results beyond a sample. Large samples are less feasible when we choose to intervene. Imagine if Olsson\u2019s team set out to train 200,000 participants for a ski race, as one might do in a randomized controlled trial. That study would be labor intensive, costly, and down-right onerous.<\/p>\n\n\n\n<p>But the feasibility of an observational study comes at a cost, usually in the form of experimental control. Olsson\u2019s team could not control for fitness level. And we don\u2019t know what the skiers and non-skiers did over the 20-year follow-up. For example, skiers might have become sedentary after the race, and non-skiers might have been involved in other, equally rigorous forms of exercise. Or maybe not. There\u2019s no way to know.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Over the holiday break, I had time to kick back and watch some movies and TV shows. As usual, the workshop gathered to watch&nbsp;Elf&nbsp;and&nbsp;The Santa Clause.&nbsp;Then I downloaded season 1 of&nbsp;Yellowstone&nbsp;to see what everyone has been talking about. I also &#8230;<\/p>\n","protected":false},"author":103,"featured_media":6516,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,13,16,32,34,56,70,95,96,127,128,136,138,140,182,198,241,245,250,303,327,378],"tags":[4241,4251,4243,1500,4247,2480,4250,2484,4245,2594,4249,2752,2777,2847,4244,4242,4248,3430,3703,3836,4246],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Shop Talk- Swedish Scientists Say Skiing Delays Symptom of Parkinson\u2019s Disease - LYL<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/liveyourlifept.com\/blog\/2023\/04\/07\/shop-talk-swedish-scientists-say-skiing-delays-symptom-of-parkinsons-disease\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Shop Talk- Swedish Scientists Say Skiing Delays Symptom of Parkinson\u2019s Disease - LYL\" \/>\n<meta property=\"og:description\" content=\"Over the holiday break, I had time to kick back and watch some movies and TV shows. 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