A group of amateur runners in a long-distance race in Switzerland.
A group of amateur runners in a long-distance race in Switzerland.
Burton Holmes' photograph entitled "1896: Three athletes in training for the marathon at the Olympic Games in Athens".
Burton Holmes' photograph entitled "1896: Three athletes in training for the marathon at the Olympic Games in Athens".
Paavo Nurmi, also known as the "Flying Finn", at the 1924 Summer Olympics in Paris; at the time, he won Olympic gold in the 5,000-meter long-distance running.[1]
Paavo Nurmi, also known as the "Flying Finn", at the 1924 Summer Olympics in Paris; at the time, he won Olympic gold in the 5,000-meter long-distance running.[1]

Long-distance running, or endurance running, is a form of continuous running over distances of at least 3 km (1.9 mi). Physiologically, it is largely aerobic in nature and requires stamina as well as mental strength.[2]

Within endurance running comes two different types of respiration. The more prominent side that runners experience more frequently is aerobic respiration. This occurs when oxygen is present, and the body is able to utilize oxygen to help generate energy and muscle activity. On the other side, anaerobic respiration occurs when the body is deprived of oxygen, and this is common towards the final stretch of races when there is a drive to speed up to a greater intensity. Overall, both types of respiration are used by endurance runners quite often but are very different from each other.

Among mammals, humans are well adapted for running significant distances, particularly so among primates. The capacity for endurance running is also found in migratory ungulates and a limited number of terrestrial carnivores, such as bears, dogs, wolves, and hyenas.

In modern human society, long-distance running has multiple purposes: people may engage in it for physical exercise, for recreation, as a means of travel, for economic reasons, or for cultural reasons. Long-distance running can also be used as a means to improves cardiovascular health.[3]

Endurance running is often a component of physical military training. Long-distance running as a form of tradition or ceremony is known among the Hopi and Tarahumara people, among others.[4][5]

In the sport of athletics, long-distance events are defined as races covering 3 km (1.9 mi) and above. The three most common types are track running, road running, and cross country running, all of which are defined by their terrain – all-weather tracks, roads, and natural terrain, respectively.

History

Hunting

Main article: Persistence hunting

Anthropological observations of modern hunter-gatherer communities have provided accounts for long-distance running as a historic method for hunting among the San of the Kalahari,[6] American Indians,[7] and Aboriginal Australians.[8] In this method, the hunter would run at a slow and steady pace between one hour and a few days, in an area where the animal has no place to hide. The animal, running in spurts, has to stop to pant in order to cool itself, but as the chase goes on it would not have enough time before it has to start running again, and after a while would collapse from exhaustion and heat.[9] The body structure of a skeleton of a 12-year-old Nariokatome boy is suggested to prove that early humans from 1.5 million years ago were eating more meat and fewer plants, and hunted by running down animals.[10][11]

Messengers

With developments in agriculture and culture, long-distance running took more and more purposes other than hunting: religious ceremonies, delivering messages for military and political purposes, and sport.[9]

Running messengers are reported from early Sumer, were named lasimu[12] as military men as well as the king's officials who disseminated documents throughout the kingdom by running.[13] Ancient Greece was famous for its running messengers, who were named hemerodromoi, meaning "day runners".[14] One of the most famous running messengers is Pheidippides, who according to the legend ran from Marathon to Athens to announce the victory of the Greek over the Persians in the Battle of Marathon in 490 B.C. He collapsed and died as he delivered the message "we won".[15] While there are debates around the accuracy of this historical legend,[16] whether Pheidippides actually ran from Marathon to Athens or between other cities, how far this was, and if he was the one to deliver the victory message,[17] the marathon running event of 26.2 miles / 42.195 km is based on this legend.

Competition

Typical long-distance track races range from 3000 metres (1.87 miles) to 10,000 metres (6.2 miles), cross country races usually cover 5 to 12 km (3 to 712 miles), while road races can be significantly longer, reaching 100 km (62 mi) and beyond. In collegiate cross-country races in the United States, men race 8,000 or 10,000 meters, depending on their division, whereas women race 6,000 meters.[18] The Summer Olympics features four long-distance running events: the 3000 metres steeplechase (which also involves jumping over barriers and water), the 5000 metres, 10,000 metres and marathon (42.195 kilometres, or 26 miles and 385 yards).

Physiology

Humans have been considered among the best distance runners among all running animals: game animals are faster over short distances, but they have less endurance than humans.[11] Unlike other primates whose bodies are suited to walk on four legs or climb trees, the human body has evolved into upright walking and running around 2-3 million years ago.[19] The human body can endure long-distance running through the following attributes:

  1. Bone and muscle structure: unlike quadruped mammals, which have their center of mass in front of the hind legs or limbs, in biped mammals including humans the center of mass lies right above the legs. This leads to different bone and muscular demands, especially in the legs and pelvis.[19]
  2. Dissipation of metabolic heat: humans’ ability to cool the body by sweating through the body surface provides many advantages over panting through the mouth or nose. These include a larger surface of evaporation and independence of the respiratory cycle.[11]

One distinction between upright walking and running is energy consumption during locomotion. While walking, humans use about half the energy needed to run.[20]

Factors

Aerobic capacity

One's aerobic capacity or VO2Max is the ability to maximally take up and consume oxygen during exhaustive exercise. Long-distance runners typically perform at around 75–85% of peak aerobic capacity, while short-distance runners perform at closer to 100% of peak.[21]: 3 

Aerobic capacity depends on the transportation of large amounts of blood to and from the lungs to reach all tissues. This in turn is dependent on having a high cardiac output, sufficient levels of hemoglobin in blood and an optimal vascular system to distribute of blood.[22] A 20-fold increase of local blood flow within the skeletal muscle is necessary for endurance athletes, like marathon runners, to meet their muscles' oxygen demands at maximal exercise that are up to 50 times greater than at rest.[22]

Elite long-distance runners often have larger hearts and decreased resting heart rates that enable them to achieve greater aerobic capacities. Increased dimensions of the heart enable an individual to achieve a greater stroke volume. A concomitant decrease in stroke volume occurs with the initial increase in heart rate at the onset of exercise. Despite an increase in cardiac dimensions, a marathoner's aerobic capacity is confined to this capped and ever-decreasing heart rate.[21]: 4–5 

The amount of oxygen that blood can carry depends on blood volume, which increases during a race, and the amount of hemoglobin in the blood.[21][page needed][23]

Other physiological factors affecting a marathon runner's aerobic capacity include pulmonary diffusion, mitochondria enzyme activity, and capillary density.[21][page needed]

A long-distance runner's running economy is their steady state requirement for oxygen at specific speeds and helps explain differences in performance for runners with very similar aerobic capacities. This is often measured by the volume of oxygen consumed, either in liters or milliliters, per kilogram of body weight per minute (L/kg/min or mL/kg/min). As of 2016 the physiological basis for this was uncertain, but it seemed to depend on the cumulative years of running and reaches a cap that longer individual training sessions cannot overcome.[21]: 7 

Lactate threshold

A long-distance runner's velocity at the lactate threshold is strongly correlated to their performance. The lactate threshold is the cross-over point between predominantly aerobic energy usage and anaerobic energy usage and is considered a good indicator of the body's ability to efficiently process and transfer chemical energy into mechanical energy.[21]: 5–6  For most runners, the aerobic zone doesn't begin until around 120 heartbeats per minute.[24] Lactate threshold training involves tempo workouts that are meant to build strength and speed, rather than improve the cardiovascular system's efficiency in absorbing and transporting oxygen.[25] By running at your lactate threshold, your body will become more efficient at clearing lactic acid and reusing it to fuel your muscles. Uncertainty exists in regard to how lactate threshold affects endurance performance.[26]

Fuel

In order to sustain high-intensity running, a marathon runner must obtain sufficient glycogen stores. Glycogen can be found in the skeletal muscles or liver. With low levels of glycogen stores at the onset of the marathon, premature depletion of these stores can reduce performance or even prevent the completion of the race. ATP production via aerobic pathways can further be limited by glycogen depletion.[21]: 56–57  Free Fatty Acids serve as a sparing mechanism for glycogen stores. The artificial elevation of these fatty acids along with endurance training demonstrates a marathon runner's ability to sustain higher intensities for longer periods of time. The prolonged sustenance of running intensity is attributed to a high turnover rate of fatty acids that allows the runner to preserve glycogen stores later into the race.[21]: 51 

Long-distance runners generally practice carbohydrate loading in their training and race preparation.[21]: 50–55 

Thermoregulation and body fluid loss

The maintenance of core body temperature is crucial to a marathon runner's performance and health. An inability to reduce rising core body temperature can lead to hyperthermia. In order to reduce body heat, the metabolically produced heat needs to be removed from the body via sweating, which in turn requires rehydration to compensate for. Replacement of fluid is limited but can help keep the body's internal temperatures cooler. Fluid replacement is physiologically challenging during the exercise of this intensity due to the inefficient emptying of the stomach. Partial fluid replacement can serve to avoid a marathon runner's body overheating but not enough to keep pace with the loss of fluid via sweat evaporation.[21]: 69ff  Environmental factors can especially complicate heat regulation.[21]: 73–74 

Altitude

Since the late 1980s, Kenyans, Moroccans, and Ethiopians have dominated in major international long-distance competitions.[27] The high altitude of these countries has been proven to help these runners achieve more success. High altitude, combined with endurance training, can lead to an increase in red blood cells, allowing increased oxygen delivery via arteries. The majority of these East African successful runners come from three mountain districts that run along the Great Rift Valley.[28] While altitude may be a contributing factor, a culture of hard work, teamwork, as well as an advanced institutional structure also contributes to their success.[29]

Impact on health

"… an evolutionary perspective indicates that we did not evolve to run long distances at fast speeds on a regular basis. As a result, it is unlikely there was a selection for the human body to cope with some of the extreme demands runners place on their bodies."[30]

The impact of long-distance running on human health is generally positive. Various organs and systems in the human body are improved: bone mineral density is increased,[31] and cholesterol is lowered.[32]

However, beyond a certain point, negative consequences might occur. Older male runners (45-55) who run more than 40 miles (64 kilometers) per week face reduced testosterone levels, although they are still in the normal range.[33] Running a marathon lowers testosterone levels by 50% in men and more than doubles cortisol levels for 24 hours.[34] Low testosterone is thought to be a physiological adaptation to the sport, as excess muscle caused maybe shed through lower testosterone, yielding a more efficient runner. Veteran, lifelong endurance athletes have been found to have more heart scarring than control groups, but replication studies and larger studies should be done to firmly establish the link, which may or may not be causal.[35] Some studies find that running more than 20 miles (32 kilometers) per week yields no lower risk for all-cause mortality than non-runners,[36] although these studies are in conflict with large studies that show longer lifespans for any increase in exercise volume.[37]

Elite-level long-distance running is associated with a 3 to 7 times higher risk of the knee osteoarthritis later in life compared to non-runners.[38]

The effectiveness of shoe inserts has been contested. Memory foam and similar shoe inserts may be comfortable, but they can make foot muscles weaker in the long term.[39] Running shoes with special features,[40] or lack thereof in the case of minimalist designs,[41] do not prevent injury. Rather, comfortable shoes and standard running styles are safer.[42]

In sport

Men in the 10 km run section of the 2011 Grand Prix de Triathlon in Paris.
Men in the 10 km run section of the 2011 Grand Prix de Triathlon in Paris.

Many sporting activities feature significant levels of running under prolonged periods of play, especially during ball sports like association football and rugby league. However, continuous endurance running is exclusively found in racing sports. Most of these are individual sports, although team and relay forms also exist.

The most prominent long-distance running sports are grouped within the sport of athletics, where running competitions are held on strictly defined courses, and the fastest runner to complete the distance wins. The foremost types are long-distance track running, road running and cross-country running. Both track and road races are usually timed, while cross country races are not always timed, and typically only the placing is of importance.[43] Other less popular variants such as fell running, trail running, mountain running, and tower running combine the challenge of distance with a significant incline or change of elevation as part of the course.[44][45]

Multisport races frequently include endurance running. Triathlon, as defined by the International Triathlon Union, may feature running sections ranging from five kilometres (3.1 miles) to the marathon distance (42.195 kilometres, or 26 miles and 385 yards), depending on the race type.[46] The related sport of duathlon is a combination of cycling and distance running.[47] Previous versions of the modern pentathlon incorporated a three or four-kilometre (1.9–2.5 mi) run, but changes to the official rules in 2008 meant the running sections are now divided into three separate legs of one kilometre each (0.6 mi).[48]

Depending on the rules and terrain, navigation sports such as foot orienteering and rogaining may contain periods of endurance running within the competition.[49] Variants of adventure racing may also combine navigational skills and endurance running in this manner.[50]

Running competitions

Track running

Main article: Track and field

Runners turning the bend in the men's 10,000 metres final at the 2012 Summer Olympics.
Runners turning the bend in the men's 10,000 metres final at the 2012 Summer Olympics.

The history of long-distance track running events are tied to the track and field stadia where they are held. Oval circuits allow athletes to cover long distances in a confined area. Early tracks were usually on flattened earth or were simply marked areas of grass. The style of running tracks became refined during the 20th century: the oval running tracks were standardised to 400 metres in distance and cinder tracks were replaced by synthetic all-weather running track of asphalt and rubber from the mid-1960s onwards. It was not until the 1912 Stockholm Olympics that the standard long-distance track events of 5000 metres and 10,000 metres were introduced.

Road running

Women runners on a closed-off-road at the 2009 Yokohama Marathon.
Women runners on a closed-off-road at the 2009 Yokohama Marathon.

Main articles: Road running and Marathon race

See also: List of World Athletics Label marathon races

Long-distance road running competitions are mainly conducted on courses of paved or tarmac roads, although major events often finish on the track of a main stadium. In addition to being a common recreational sport, the elite level of the sport – particularly marathon races – is one of the most popular aspects of athletics. Road racing events can be of virtually any distance, but the most common and well-known is the marathon, half marathon, and 10 km run.

The sport of road running finds its roots in the activities of footmen: male servants who ran alongside the carriages of aristocrats around the 18th century, and who also ran errands over distances for their masters. Foot racing competitions evolved from wagers between aristocrats, who pitted their footman against that of another aristocrat in order to determine a winner. The sport became professionalised as footmen were hired specifically on their athletic ability and began to devote their lives to training for gambling events. The amateur sports movement in the late 19th century marginalised competitions based on the professional, gambling model. The 1896 Summer Olympics saw the birth of the modern marathon and the event led to the growth of road running competitions through annual public events such as the Boston Marathon (first held in 1897) and the Lake Biwa Marathon and Fukuoka Marathons, which were established in the 1940s. The 1970s running boom in the United States made road running a common pastime and also increased its popularity at the elite level.[51]

The marathon is the only road running event featured at the IAAF World Championships in Athletics and the Summer Olympics, although there is also the IAAF World Half Marathon Championships held every two years. The marathon is also the only road running event featured at the IPC Athletics World Championships and the Summer Paralympics. The World Marathon Majors series includes the six most prestigious marathon competitions at the elite level – the Berlin, Boston, Chicago, London, Tokyo, and New York City marathons. The Tokyo Marathon was most recently added to the World Marathon Majors in 2012.[52]

Ekiden contests – which originated in Japan and remain common there – are a relay race variation on the marathon, in contrast to the typically individual sport of road running.

Cross country running

Main articles: Cross country running, Trail running, Fell running, and Mountain running

Cross-country running is the most naturalistic form of long-distance running in athletics as competitions take place on open-air courses over surfaces such as grass, woodland trails, earth, or mountains. In contrast to the relatively flat courses in track, road races, and cross country usually incorporates obstacles such as muddy sections, logs, and mounds of earth. As a result of these factors, weather can play an integral role in racing conditions. Cross country is both an individual and team sport, as runners are judged on an individual basis and a points-scoring method is used for teams. Competitions are typically races of 4 km (2.5 mi) or more which are usually held in autumn and winter. Cross country's most successful athletes often compete in long-distance track and road events as well.

Women racing on snow in the 2012 European Cross Country Championships
Women racing on snow in the 2012 European Cross Country Championships

The history of the sport is linked with the game of paper chase, or hare and hounds, where a group of runners would cover long distances to chase a leading runner, who left a trail of paper to follow. The Crick Run in England in 1838 was the first recorded instance of an organised cross-country competition. The sport gained popularity in British, then American schools in the 19th century and culminated in the creation of the first International Cross Country Championships in 1903.[53] The annual IAAF World Cross Country Championships was inaugurated in 1973 and this remains the highest level of competition for the sport. A number of continental cross country competitions are held, with championships taking place in Africa, Asia, Europe, Oceania, North America and South America. The sport has retained its status at the scholastic level, particularly in the United Kingdom and the United States. At the professional level, the foremost competitions come under the banner of the IAAF Cross Country Permit Meetings.

While cross country competitions are no longer held at the Olympics, having featured in the athletics programme from 1912 to 1924, it has been present as one of the events within the modern pentathlon competition since the 1912 Summer Olympics.

Fell running, trail running, and mountain running can all be considered variations on the traditional cross country which incorporate significant uphill and/or downhill sections as an additional challenge to the course.

Adventure running

The term adventure running is loosely defined and can be used to describe any form of long-distance running in a natural setting, regardless of the running surface. It may include river crossing, scrambling, snow, extremely high or low temperatures, and high altitudes. It has both competitive and non-competitive forms, the latter being for individual recreation or social experience. As a result, courses are often set in scenic locations and feature obstacles designed to give participants a sense of achievement. It bears similarities to running sections of adventure racing.[54][55]

Ultra-long distance: extended events and achievements

Main articles: Ultramarathon and Multiday races

A number of events, records, and achievements exist for long-distance running, outside the context of track and field sports events. These include multiday races, ultramarathons, and long-distance races in extreme conditions or measuring hundreds or thousands of miles.

Beyond these, records and stand-alone achievements, rather than regular events, exist for individuals who have achieved running goals of a unique nature, such as running across or around continents (see lists of runners: America, Australia) or running around the world.

See also

Notes and references

  1. ^ "50 stunning Olympic moments No31: Paavo Nurmi wins 5,000m in 1924 | Simon Burnton". The Guardian. 18 May 2012. Retrieved 4 January 2023.
  2. ^ Grine, Frederick E. et al (October 2006). The First Humans - Origin and Early Evolution of the Genus Homo Archived 1 November 2013 at the Wayback Machine. Stonybrook University. Retrieved 11 April 2013.
  3. ^ Herreman, Kari (12 September 2013). "What Are the Health Benefits of Running Half Marathons?". runnersgoal.com. Retrieved 1 March 2017.
  4. ^ Running in Hopi History and Culture. Hopi Cultural Preservation Office/Northern Arizona University. Retrieved 11 April 2013.
  5. ^ Lonergan, J. E. The ecology of servitude in Tarahumara ritual tesgüinada. International Society for Gesture Studies. Retrieved 11 April 2013.
  6. ^ Bjerre, Jens. Kalahari. Hill and Wang, 1960.
  7. ^ Bennett, Wendell Clark, and Robert Mowry Zingg. "The Tarahumara, an Indian tribe of northern Mexico." (1935).
  8. ^ Sollas, W. J. 1924. Ancient hunters and their modern representatives. New York: Macmillan
  9. ^ a b Sears, Edward Seldon. Running through the Ages. McFarland, 2001.
  10. ^ Walker, A., and Leakey, R. (1993). Nariokotome Homo Erectus Skeleton.
  11. ^ a b c Carrier, D. R., Kapoor, A. K., Kimura, T., Nickels, M. K., Satwanti, Scott, E. C., So, J. K., & Trinkaus, E. (1984). The energetic paradox of human running and hominid evolution. Current Anthropology, Vol. 25, No. 4 (Aug. - Oct. 1984), pp. 483-495.
  12. ^ The Assyrian Dictionary L (Chicago: The Oriental Institute), 104–108. 1973
  13. ^ Deane Anderson Lamont, Running Phenomena in Ancient Sumer" Journal of Sport History, Vol.22, No. 3 (Fall 1995).
  14. ^ "UltraLegends.com is for sale". HugeDomains. Retrieved 4 January 2023.
  15. ^ Hammond, N. G. L. (1968). "The Campaign and the Battle of Marathon". The Journal of Hellenic Studies. 88: 13–57. doi:10.2307/628670. JSTOR 628670.
  16. ^ "The History of the Olympic Marathon". marathonguide.com. Retrieved 4 January 2023.
  17. ^ The" Hemerodromoi": Ultra Long-Distance Running in Antiquity. The Classical World, Vol. 68, No. 3 (Nov. 1974), pp. 161-169.
  18. ^ "Should you think about running in college? – Running Writings". runningwritings.com.
  19. ^ a b Lovejoy, C. O. (1988). Evolution of human walking. Scientific American (0036-8733), 259 (5), p. 82.
  20. ^ Margaria, R.; Cerretelli, P.; Aghemo, P.; Sassi, G. (1963). "Energy cost of running". Journal of Applied Physiology. 18 (2): 367–370. doi:10.1152/jappl.1963.18.2.367. PMID 13932993.
  21. ^ a b c d e f g h i j k Zinner, Christoph; Sperlich, Billy, eds. (2016). Marathon Running: Physiology, Psychology, Nutrition and Training Aspects. Springer. ISBN 9783319297286.
  22. ^ a b Sarelius, I; Pohl, U (August 2010). "Control of muscle blood flow during exercise: local factors and integrative mechanisms". Acta Physiologica. 199 (4): 349–65. doi:10.1111/j.1748-1716.2010.02129.x. PMC 3157959. PMID 20353492.
  23. ^ Mairbäurl, Heimo (12 November 2013). "Red blood cells in sports: effects of exercise and training on oxygen supply by red blood cells". Frontiers in Physiology. 4: 332. doi:10.3389/fphys.2013.00332. PMC 3824146. PMID 24273518.
  24. ^ "Lactate Threshold: What It Is And How Do You Leverage It In Training? | Competitor.com". Competitor.com. 17 March 2014. Retrieved 22 May 2018.
  25. ^ "Benefits of Lactate Threshold Training for Distance Runners". Minneapolis Running. 23 March 2015. Retrieved 22 May 2018.
  26. ^ Faude, Oliver; Kindermann, Wilfried; Meyer, Tim (2009). "Lactate threshold concepts: how valid are they?". Sports Medicine (Auckland, N.Z.). 39 (6): 469–490. doi:10.2165/00007256-200939060-00003. ISSN 0112-1642. PMID 19453206. S2CID 31839157.
  27. ^ Roth, Stephen (2011). Exercise Genomics. p. 186.
  28. ^ "Why Are Kenya And Ethiopia So Good at Long-Distance Running?". Mpora. Retrieved 22 May 2018.
  29. ^ "Why Ethiopia's running success is about more than poverty and altitude". The Guardian. 15 August 2018. Retrieved 23 December 2022.
  30. ^ Lieberman, Daniel E. (2017). "History of Distance Running". In Waite, Brandee L.; Krabak, Brian J.; Lipman, Grant S. (eds.). The Long Distance Runner's Guide to Injury Prevention and Treatment. Skyhorse Publishing. pp. 2–17.
  31. ^ Hagihara, Yoshinobu; Nakajima, Arata; Fukuda, Satoshi; Goto, Sumio; Iida, Haruzo; Yamazaki, Masashi (October 2009). "Running exercise for short duration increases bone mineral density of loaded long bones in young growing rats". The Tohoku Journal of Experimental Medicine. 219 (2): 139–143. doi:10.1620/tjem.219.139. ISSN 1349-3329. PMID 19776531.
  32. ^ Gordon, Benjamin; Chen, Stephen; Durstine, J. Larry (July 2014). "The effects of exercise training on the traditional lipid profile and beyond". Current Sports Medicine Reports. 13 (4): 253–259. doi:10.1249/JSR.0000000000000073. ISSN 1537-8918. PMID 25014391. S2CID 10408945.
  33. ^ MacKelvie, K; Taunton, J; McKay, H; Khan, K (August 2000). "Bone mineral density and serum testosterone in chronically trained, high mileage 40–55-year-old male runners". British Journal of Sports Medicine. 34 (4): 273–278. doi:10.1136/bjsm.34.4.273. ISSN 0306-3674. PMC 1724199. PMID 10953900.
  34. ^ França, Sheyla Carla A.; Neto, Barros; Leite, Turíbio; Agresta, Marisa Cury; Lotufo, Renato Fraga M.; Kater, Claudio E. (December 2006). "Divergent responses of serum testosterone and cortisol in athlete men after a marathon race". Arquivos Brasileiros de Endocrinologia & Metabologia. 50 (6): 1082–1087. doi:10.1590/S0004-27302006000600015. ISSN 0004-2730. PMID 17221115.
  35. ^ Wilson, Mathew G.; O'Hanlon, Rory; Prasad, Sanjay; Deighan, Amanda; MacMillan, Philip; Oxborough, David; Godfrey, Richard J.; Smith, Gill; Maceira, Alicia (17 February 2011). "Diverse patterns of myocardial fibrosis in lifelong, veteran endurance athletes". Journal of Applied Physiology. 110 (6): 1622–6. doi:10.1152/japplphysiol.01280.2010. ISSN 8750-7587. PMC 3119133. PMID 21330616.
  36. ^ Design, ISITE. "OASIS". abstractsonline.com. Retrieved 14 June 2017.
  37. ^ Wen, Chi Pang; Wai, Jackson Pui Man; Tsai, Min Kuang; Yang, Yi Chen; Cheng, Ting Yuan David; Lee, Meng-Chih; Chan, Hui Ting; Tsao, Chwen Keng; Tsai, Shan Pou (1 October 2011). "Minimum amount of physical activity for reduced mortality and extended life expectancy: a prospective cohort study". Lancet. 378 (9798): 1244–1253. doi:10.1016/S0140-6736(11)60749-6. ISSN 1474-547X. PMID 21846575. S2CID 9538733.
  38. ^ Driban JB, Hootman JM, Sitler MR, Harris KP, Cattano NM (June 2017). "Is Participation in Certain Sports Associated With Knee Osteoarthritis? A Systematic Review". Journal of Athletic Training. 52 (6): 497–506. doi:10.4085/1062-6050-50.2.08. PMC 5488840. PMID 25574790.
  39. ^ Richard A. Lovett (9 June 2014). "A Guide to Running Shoe Inserts". Runner's World. Retrieved 14 April 2018.
  40. ^ Arnold, John. "Expensive running shoes don't prevent injuries, but comfortable ones might". The Conversation. Retrieved 14 April 2018.
  41. ^ Craig Payne (28 January 2017). "RCT of traditional running shoes vs minimalist running shoes". The American Journal of Sports Medicine. 45 (5): 1162–1170. doi:10.1177/0363546516682497. PMID 28129518. S2CID 25996480. Retrieved 14 April 2018.
  42. ^ "The evidence-based solution for choosing running shoes". evidencebasedliving.human.cornell.edu. Retrieved 14 April 2018.
  43. ^ Competition Rules 2012-13. IAAF. Retrieved 13 April 2013.
  44. ^ 60-Second Guide: Fell Running Archived 8 August 2014 at the Wayback Machine. Runner's World (25 March 2008). Retrieved 13 April 2013.
  45. ^ "Benjie Goodhart: Why is tower running so popular?". The Guardian. 2 June 2008. Retrieved 4 January 2023.
  46. ^ Triathlon, World. "Age-Group". World Triathlon. Retrieved 4 January 2023.
  47. ^ About Duathlon Archived 13 February 2013 at the Wayback Machine. USA Triathlon. Retrieved 13 April 2013.
  48. ^ Branch, John (27 November 2008). "Modern Pentathlon Gets a Little Less Penta". The New York Times. ISSN 0362-4331. Retrieved 4 January 2023.
  49. ^ "Where to Find New Running Routes Near You". Verywell Fit. Retrieved 4 January 2023.
  50. ^ Adventure Racing Basics Archived 3 September 2012 at the Wayback Machine. Adventure Sports Online. Retrieved 13 April 2013.
  51. ^ Road running – Introduction Archived 23 October 2012 at the Wayback Machine. IAAF. Retrieved 27 May 2010.
  52. ^ Belson, Ken (2 November 2012). "Tokyo Will Be Added as Sixth Major Marathon". The New York Times. Retrieved 1 March 2017.
  53. ^ Cross country – Introduction Archived 27 February 2011 at the Wayback Machine. IAAF. Retrieved 27 May 2010.
  54. ^ "Results". DGL AdventureRunning. Retrieved 4 January 2023.
  55. ^ WR, Team (28 March 2018). "The Call To Adventure Racing". Women's Running. Retrieved 4 January 2023.