{"id":18069,"date":"2025-08-06T08:59:45","date_gmt":"2025-08-06T12:59:45","guid":{"rendered":"https:\/\/observatoireprevention.org\/?p=18069"},"modified":"2025-08-06T08:59:46","modified_gmt":"2025-08-06T12:59:46","slug":"the-impact-of-evening-exercise-on-sleep","status":"publish","type":"post","link":"https:\/\/observatoireprevention.org\/en\/2025\/08\/06\/the-impact-of-evening-exercise-on-sleep\/","title":{"rendered":"The Impact of Evening Exercise on Sleep"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<p>All our basic physiological functions\u2014such as blood pressure, heart rate, breathing, and digestion\u2014are regulated automatically, without requiring conscious effort. The nervous system responsible for this autonomous control is divided into two major branches that work together to ensure the body responds appropriately to different situations:<\/p>\n\n\n\n<p>\u2013&nbsp;<strong>The sympathetic nervous system<\/strong>&nbsp;is activated when energy demands increase, such as in stressful or alert situations (physical exertion or perceived danger), preparing the body to face a physical or psychological challenge. For example, it increases heart rate and the strength of heart contractions, dilates airways to raise blood oxygen levels, triggers the release of stored energy, dilates arteries in the muscles used during activity (including the heart) to boost blood flow, and enhances muscle strength.<\/p>\n\n\n\n<p>\u2013&nbsp;<strong>The parasympathetic nervous system<\/strong>, on the other hand, acts as a counterbalance to the sympathetic system, aiming to restore the body\u2019s equilibrium. It slows the heart rate, reduces blood pressure, stimulates digestion to replenish energy reserves, and promotes tissue repair through anti-inflammatory actions. Regular physical activity boosts parasympathetic activity, reflected by a slower resting heart rate and greater heart rate variability.<\/p>\n\n\n\n<p><strong>Parasympathetic Sleep<\/strong><\/p>\n\n\n\n<p>Sleep is perhaps one of the best examples of the importance of the balance between sympathetic and parasympathetic nervous system activity. Under normal conditions, parasympathetic activity dominates at bedtime, slowing the heart rate and relaxing the muscles; the resulting sleep supports physical and mental regeneration. However, external stimuli such as noise, bright light, potential threats, or mental stress can trigger sympathetic activity, which interferes with these recovery signals and disrupts both the duration and quality of sleep.<\/p>\n\n\n\n<p>This balance between the sympathetic and parasympathetic systems during sleep can also be influenced by physical activity. On one hand, it is well documented that exercise has positive effects on sleep by promoting dominant parasympathetic activity, increasing energy expenditure, reducing stress, and improving mood. On the other hand, it is also clearly established that workouts performed close to bedtime can cause strong sympathetic activation (e.g. increased breathing and heart rate), and&nbsp;<a href=\"https:\/\/link.springer.com\/article\/10.1007\/s00421-014-2873-2\">the resulting physiological arousal may disrupt sleep<\/a>. In other words, the timing of physical activity can greatly influence sleep quality\u2014either positively or negatively.<\/p>\n\n\n\n<p><strong>Evening Exercise<\/strong><\/p>\n\n\n\n<p>For many people, exercising in the evening is the most practical way to fit their favourite sport into their daily routine. According to the results of&nbsp;<a href=\"https:\/\/www.nature.com\/articles\/s41467-025-58271-x\">a recent study<\/a>, this timing is not incompatible with quality sleep\u2014provided that the activity is completed long enough before going to bed.<\/p>\n\n\n\n<p>In this study, researchers analyzed data collected over one year from 14,689 users of the biometric monitoring platform WHOOP Inc. (Boston, MA), all of whom were at least 18 years old and physically active (engaging in at least 1\u20132 exercise sessions per week). These wearable devices continuously track several physiological parameters, including heart and breathing rates, heart rate variability, sleep periods, and physical activity levels. Within this cohort, four major categories of physical activity were identified, ranging from light to very intense (Table&nbsp;1).<\/p>\n\n\n\n<table id=\"tablepress-160\" class=\"tablepress tablepress-id-160\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Strain<\/th><th class=\"column-2\">Exercise count<\/th><th class=\"column-3\">Example<\/th><th class=\"column-4\">Intensity<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Light<\/td><td class=\"column-2\">834,363 (46.5%)*<\/td><td class=\"column-3\">Brisk walk<\/td><td class=\"column-4\">30 min at 65% of HRmax**<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Moderate<\/td><td class=\"column-2\">643,045 (35.8%)<\/td><td class=\"column-3\">Gym class<\/td><td class=\"column-4\">45 min at 85% of HRmax<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">High<\/td><td class=\"column-2\">274,459 (15.3%)<\/td><td class=\"column-3\">15 km run<\/td><td class=\"column-4\">90 min at 85% of HRmax<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Maximal<\/td><td class=\"column-2\">43,437 (2.4%)<\/td><td class=\"column-3\">Hockey game<\/td><td class=\"column-4\">120 min at 85% of HRmax<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-160 from cache -->\n\n\n<p><strong>Table&nbsp;1. Levels of Exercise Performed by Study Participants<\/strong><br>*&nbsp;Note: Activities lasting less than one minute as well as relaxation exercises such as yoga and stretching were excluded from the analysis. **&nbsp;HRmax = maximum heart rate. HRmax can be approximately calculated using the formula \u201c220 \u2013 age\u201d for men and \u201c226 \u2013 age\u201d for women. The numbers in parentheses represent the percentage of total exercise sessions performed by all participants.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>The analysis revealed that when exercise ended&nbsp;4 to 6 hours&nbsp;before the participants\u2019 usual sleep time,&nbsp;sleep onset was similar&nbsp;to that of days without exercise,&nbsp;regardless of the exercise intensity&nbsp;(Figure&nbsp;1A). However, when exercise ended&nbsp;closer to bedtime, sleep onset became&nbsp;progressively delayed&nbsp;across all levels of exercise intensity, with the effect&nbsp;particularly pronounced&nbsp;for&nbsp;very high-intensity activities.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"906\" src=\"https:\/\/observatoireprevention.org\/wp-content\/uploads\/2025\/08\/Fig-1-ENG-1024x906.jpg\" alt=\"\" class=\"wp-image-18070\" srcset=\"https:\/\/observatoireprevention.org\/wp-content\/uploads\/2025\/08\/Fig-1-ENG-1024x906.jpg 1024w, https:\/\/observatoireprevention.org\/wp-content\/uploads\/2025\/08\/Fig-1-ENG-300x265.jpg 300w, https:\/\/observatoireprevention.org\/wp-content\/uploads\/2025\/08\/Fig-1-ENG-768x680.jpg 768w, https:\/\/observatoireprevention.org\/wp-content\/uploads\/2025\/08\/Fig-1-ENG-1536x1359.jpg 1536w, https:\/\/observatoireprevention.org\/wp-content\/uploads\/2025\/08\/Fig-1-ENG.jpg 1878w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Figure&nbsp;1. Relationship Between Timing of Exercise Before Bedtime and Subsequent Sleep Quality<\/strong><br>Note: Heart rate variability (HRV)\u2014the variation between successive heartbeats\u2014is expressed using a statistical measure called RMSSD (Root Mean Square of Successive Differences). Adapted from&nbsp;<a href=\"https:\/\/www.nature.com\/articles\/s41467-025-58271-x\">Leota et al. (2025)<\/a>.<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>The&nbsp;delay in falling asleep&nbsp;clearly has a tangible impact on total sleep duration, with a&nbsp;relatively modest loss&nbsp;of about&nbsp;15 minutes&nbsp;following&nbsp;light activity performed 2 hours&nbsp;before usual bedtime, but this loss can become quite&nbsp;significant, reaching&nbsp;nearly 45 minutes&nbsp;after&nbsp;very intense activity&nbsp;(Figure&nbsp;2B).<\/p>\n\n\n\n<p>Cardiovascular data analysis indicates that the&nbsp;disruptive effect&nbsp;of exercise performed shortly before bedtime on sleep is due to a&nbsp;reduction in parasympathetic activity. For example, there is a&nbsp;notable increase in resting heart rate, especially among those who performed intense exercise&nbsp;2\u20134 hours&nbsp;before their usual sleep onset (Figure&nbsp;1C), along with a&nbsp;marked decrease in heart rate variability (HRV)&nbsp;(Figure&nbsp;1D).<\/p>\n\n\n\n<p>A healthy heart doesn\u2019t beat like a metronome\u2014HRV refers to the small, natural variations between heartbeats. These variations&nbsp;increase when parasympathetic activity is dominant, so the observed&nbsp;decrease in HRV&nbsp;after&nbsp;moderate to high-intensity evening exercise&nbsp;suggests that the recovery period&nbsp;was not long enough&nbsp;for the parasympathetic nervous system to fully counterbalance the stimulating effects of exercise on the sympathetic system.<\/p>\n\n\n\n<p>Interestingly,&nbsp;<a href=\"https:\/\/link.springer.com\/article\/10.1007\/s40279-013-0083-4\">other studies<\/a>&nbsp;have shown that&nbsp;full parasympathetic recovery after very intense exercise&nbsp;can take more than&nbsp;24 hours, which could explain the&nbsp;higher resting heart rate&nbsp;and&nbsp;lower HRV&nbsp;even when the intense workout was completed&nbsp;more than 10 hours before bedtime&nbsp;(Figures&nbsp;1C and 1D).<\/p>\n\n\n\n<p>In summary, these findings indicate that it is possible to&nbsp;mitigate the stimulating effect&nbsp;of exercise on the sympathetic nervous system\u2014and the resulting&nbsp;disruption to sleep\u2014simply by&nbsp;finishing a workout at least 4 hours&nbsp;before one\u2019s usual bedtime.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A study shows that people who exercise in the evening can improve their sleep quality by finishing their physical activity at least 4 hours before bedtime.<\/p>\n","protected":false},"author":3,"featured_media":17937,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"coauthors":[1619],"class_list":["post-18069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Impact of Evening Exercise on Sleep | Observatoire de la pr\u00e9vention de l&#039;Institut de Cardiologie de 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