Endurance Exercise

Original Editor - Lucinda hampton

Top Contributors - Lucinda hampton  

Introduction[edit | edit source]

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The fundamental requirement for any endurance sport is the ability to sustain a submaximal work rate for a prolonged period. Examples include cycling, swimming, rowing, cross-country skiing etc. The ability to compete strongly in endurance events is influenced by our physical fitness and psychological strengths

  • Endurance training involves developing both general and event specific endurance. And the mental toughness or “grit” needed to achieve our peak performance..

Types of Endurance Exercise[edit | edit source]

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Endurance exercise means a general ability to do any kind of physical activity that increases your heart rate above 50% of your maximum. It can be divided into general endurance and specific endurance.

  1. Specific endurance is the ability to stand against fatigue in sport specific conditions. The better the sport specific endurance, the better performance at this specific sport. It can be characterised as a combination of various types of endurance needed to maximise the ability to succeed in the discipline. eg, if you’re a 1500m runner, you use a combination of endurance training methods to perform better at your specific distance.
  2. General endurance characterises the ability of the whole body to tolerate endurance exercises and diminish fatigue. The better your general endurance the better you can stand longer efforts at various sports disciplines. eg, if you are a 30 km cyclist you have a high level of general endurance, you can perform at a relativly high level also at 100km, but you can’t beat 100 km cyclists who have been developing their distance specific endurance[2].

New Insights[edit | edit source]

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The classical view of training specificity is that: individuals who train by exercising for a long time will develop better oxygen delivery to muscle and endurance capacity; those who work against a heavy load will get bigger and stronger muscles.

Recent work using high-intensity interval training (HIIT) to increase endurance and low-load resistance training to failure to increase muscle size and strength have challenged the classical view of training specificity.[3]

HIIT

  • Is a highly desirable workout, because it engaging all muscle fibers, the fast twitch as well as the slow twitch. This makes anaerobic (HIIT) good for a complete training effect.
  • The benefits from anaerobic (HIT) exercise depend on the effort put in. Maximum “effort” by a large muscle mass, such as the legs, produces optimum benefits for the whole body.
  • Typically, a HIIT workout will range from 10 to 30 minutes in duration[4].

Adaptations in Skeletal Muscle[edit | edit source]

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Endurance training leads to adaptations in both the cardiovascular and musculoskeletal system that supports an overall increase in exercise capacity and performance.

The local adaptations in skeletal muscle, such as increased mitochondrial biogenesis and capillary density, aid in the body’s ability to transport and use oxygen to generate energy and therefore delay the onset of muscle fatigue during prolonged aerobic performance. The mitochondrion is the main organelle for energy production through the generation of adenosine triphosphate (ATP) via the electron transport system.[3]

Cardiovascular Adaptations[edit | edit source]

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Aerobic exercise training leads to cardiovascular changes that markedly increase aerobic power and lead to improved endurance performance. The functionally most important adaptation is the improvement in maximal cardiac output which is the result of an enlargement in cardiac dimension, improved contractility, and an increase in blood volume, allowing for greater filling of the ventricles and a consequent larger stroke volume. In parallel with the greater maximal cardiac output, the perfusion capacity of the muscle is increased, permitting for greater oxygen delivery. To accommodate the higher aerobic demands and perfusion levels, arteries, arterioles, and capillaries adapt in structure and number. The diameters of the larger conduit and resistance arteries are increased minimizing resistance to flow[5].

  • Cardiac dimension: The thickness of both, the septum and posterior wall increases to the same extent as the interior volume. The mass/volume ratio, and therefore the maximum systolic wall stress, remains constant in contrast to pathologic forms of hypertrophy.[6]

Endurance Exercise Performance in Ageing[edit | edit source]

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Peak endurance performance is maintained until ∼35 years of age, followed by modest decreases until 50–60 years of age, with progressively steeper declines thereafter. Among the three main physiological determinants of endurance exercise performance (i.e. VO2 max, lactate threshold and exercise economy), a progressive reduction in VO2 max appears to be the primary mechanism associated with declines in endurance performance with ageing.

Masters endurance athletes are capable of remarkable athletic and physiological functional performance, thereby representing a uniquely positive example of ‘exceptional ageing’. Nevertheless, endurance exercise performance decreases during middle-age and declines at an even more rapid rate in older age.[7]

Image: Antonio Molinari (born 13 February 1967) World Masters Mountain Running Championships 2021, a course of 7.4 kilometres involving a climb of 775 metres

The Role of Supplements[edit | edit source]

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The world of endurance nutrition is continually evolving and the commercial supplement industry is ever-changing. Elite athletes, after maximising training adaptations, often look to gain marginal benefits with supplements. It is recommended that athletes obtain nutrition from whole foods. However athletes often look to supplements. Below summarises the key recommendations for macronutrients, hydration, and supplements.

  • High carbohydrate diets continue to be recommended in endurance athletes. Most endurance athletes are familiar with high carbohydrate diets, but the importance of protein (both total daily intake and immediate post-exercise consumption) may not be as well-known by athletes. Adequate intake of protein is emphasized to improve recovery, ameliorate muscle damage, and maintain muscle mass.
  • Fats recently have been gaining popularity again, especially with ultra-endurance athletes.
  • There has been a shift away from forced hydration plans and personalizing fluid intake according to thirst and sweat rates to avoid exercise-associated hyponatremia. To reduce this risk fluid intake should be limited to 300–600 mL per hour in ultra-endurance races.[8]
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Athletes commonly take supplements, and a few supplements may have merit in the endurance world.

  • Nitrates are a vasodilator. Vasodilators widen (dilate) the blood vessels, improving blood flow and allowing more oxygen-rich blood to reach the heart muscle. They may help reduce oxygen cost and improve time to exhaustion, possibly cardiorespiratory performance at anaerobic threshold, and even VO2max. Studies are mixed however, and nitrate may preferentially benefit non-elite recreational athletes.
  • Antioxidants may help an athlete who has already peaked in terms of training adaptation, where the main goal is facilitating recovery and earlier return to competition in multi-stage events.
  • Caffeine has a very large body of research behind its ergogenic effects, with side effects being the main limiting factor[9].

References[edit | edit source]

  1. Training for endurance What is endurance? Available: https://training4endurance.co.uk/physiology-of-endurance/what-is-endurance/(accessed 25.11.2021)
  2. Blogsportlyzer Types of Endurance Training Explained Available: https://blog.sportlyzer.com/en/types-of-endurance-training-explained/ (accessed 25.11.2021)
  3. 3.0 3.1 Hughes DC, Ellefsen S, Baar K. Adaptations to endurance and strength training. Cold Spring Harbor perspectives in medicine. 2018 Jun 1;8(6):a029769. Available:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5983157/ (accessed 25/11/2021)
  4. Healthline Anaerobic Exercise Available from: https://www.healthline.com/health/fitness-exercise/anaerobic-exercise#types (accessed 25.11.2021)
  5. Hellsten Y, Nyberg M. Cardiovascular adaptations to exercise training. Comprehensive Physiology. 2011 Jan 17;6(1):1-32.Available:https://pubmed.ncbi.nlm.nih.gov/26756625/ (accessed 26.11.2021)
  6. Dickhuth HH, Röcker K, Mayer F, König D, Korsten-Reck U. Ausdauersport und kardiale Adaptation (Sportherz) [Endurance training and cardial adaptation (athlete's heart)]. Herz. 2004 Jun;29(4):373-80. Available: https://pubmed.ncbi.nlm.nih.gov/15241536/ (accessed 26.11.2021)
  7. Tanaka H, Seals DR. Endurance exercise performance in Masters athletes: age‐associated changes and underlying physiological mechanisms. The Journal of physiology. 2008 Jan 1;586(1):55-63. Accessed https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2375571/26.11.2021)
  8. Nikolaidis PT, Veniamakis E, Rosemann T, Knechtle B. Nutrition in ultra-endurance: state of the art. Nutrients. 2018 Dec;10(12):1995. Available: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6315825/ (accessed 26.11.2021)
  9. Vitale K, Getzin A. Nutrition and supplement update for the endurance athlete: review and recommendations. Nutrients. 2019 Jun;11(6):1289.Available:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6628334/ (accessed 25.11.2021)