Physical fitness

Physical fitness can be achieved through exercise. Photo shows Rich Froning Jr. – four-time winner of "Fittest Man on Earth" title.

Physical fitness is a general state of health and well-being and, more specifically, the ability to perform aspects of sports, occupations and daily activities. Physical fitness is generally achieved through proper nutrition,[1] moderate-vigorous physical exercise, physical activity,[2] and sufficient rest.[3]

Before the industrial revolution, fitness was defined as the capacity to carry out the day’s activities without undue fatigue. However, with automation and changes in lifestyles physical fitness is now considered a measure of the body's ability to function efficiently and effectively in work and leisure activities, to be healthy, to resist hypokinetic diseases, and to meet emergency situations.[4]

Fitness

Fitness is defined as the quality of being suitable to perform a particular task. Around 1950, perhaps consistent with the Industrial Revolution and the treatise of World War II, the term "fitness" increased in western vernacular by a factor of ten.[5] Modern definition of fitness describe either a person or machine's ability to perform a specific function or a holistic definition of human adaptability to cope with various situations. This has led to an interrelation of human fitness and attractiveness which has mobilized global fitness and fitness equipment industries. Regarding specific function, fitness is attributed to personnel who possess significant aerobic or anaerobic ability, i.e. strength or endurance. A holistic definition of fitness is described by Greg Glassman in the CrossFit journal as an increased work capacity across broad times and modal domains; mastery of several attributes of fitness including strength, endurance, power, speed, balance and coordination and being able to improve the amount of work done in a given time with any of these domains.[6] A well rounded fitness program will improve a person in all aspects of fitness, rather than one, such as only cardio/respiratory endurance or only weight training.

A woman performs plank exercise for strengthening of muscles

A comprehensive fitness program tailored to an individual typically focuses on one or more specific skills,[7] and on age-[8] or health-related needs such as bone health.[9] Many sources[10] also cite mental, social and emotional health as an important part of overall fitness. This is often presented in textbooks as a triangle made up of three points, which represent physical, emotional, and mental fitness. Physical fitness can also prevent or treat many chronic health conditions brought on by unhealthy lifestyle or aging.[11] Working out can also help some people sleep better and possibly alleviate some mood disorders in certain individuals.[12]

Developing research has demonstrated that many of the benefits of exercise are mediated through the role of skeletal muscle as an endocrine organ. That is, contracting muscles release multiple substances known as myokines which promote the growth of new tissue, tissue repair, and various anti-inflammatory functions, which in turn reduce the risk of developing various inflammatory diseases.[13]

Activity guidelines

The Physical Activity Guidelines for Americans was created by the Office of Disease Prevention and Health Promotion. This publication suggests that all adults should avoid inactivity to promote good health mentally and physically. For substantial health benefits, adults should participate in at least 150 minutes (two hours and 30 minutes) a week of moderate-intensity, or 75 minutes (1 hour and 15 minutes) a week of vigorous-intensity aerobic physical activity, or an equivalent combination of moderate- and vigorous-intensity aerobic activity. Aerobic activity should be performed in episodes of at least 10 minutes, and preferably, it should be spread throughout the week. For additional and more extensive health benefits, adults should increase their aerobic physical activity to 300 minutes (5 hours) a week of moderate-intensity, or 150 minutes a week of vigorous-intensity aerobic physical activity, or an equivalent combination of moderate- and vigorous-intensity activity. Additional health benefits are gained by engaging in physical activity beyond this amount. Adults should also do muscle-strengthening activities that are moderate or high intensity and involve all major muscle groups on 2 or more days a week, as these activities provide additional health benefits.[14]

Training

Specific or task-oriented fitness is a person's ability to perform in a specific activity with a reasonable efficiency: for example, sports or military service. Specific training prepares athletes to perform well in their sports.

Examples are:

Swimmers perform squats prior to entering the pool in a U.S. military base, 2011

In order for physical fitness to benefit the health of an individual, an unknown response in the person called a stimulus will be triggered by the exertion. When exercise is performed with the correct amount of intensity, duration and frequency, a significant amount of improvement can occur. The person may overall feel better but the physical effects on the human body take weeks or months to notice and possibly years for full development. For training purposes, exercise must provide a stress or demand on either a function or tissue. To continue improvements, this demand must eventually increase little over an extended period of time. This sort of exercise training has three basic principles: overload, specificity, and progression. These principles are related to health but also enhancement of physical working capacity.[21]

High Intensity Interval Training (HIIT)

High Intensity Interval Training consists of repeated, short bursts of exercise, completed at a high level of intensity. These sets of intense activity are followed by a predetermined time of rest or low intensity activity.[22] Studies have shown that exercising at a higher intensity has increased cardiac benefits for humans, compared to when exercising at a low or moderate level.[23] When your workout consists of an HIIT session, your body has to work harder to replace the oxygen it lost. Research into the benefits of HIIT have revealed that it can be very successful for reducing fat, especially around the abdominal region. Furthermore, when compared to continuous moderate exercise, HIIT proves to burn more calories and increase the amount of fat burned post- HIIT session.[24] Lack of time is one of the main reasons stated for not exercising; HIIT is a great alternative for those people because the duration of an HIIT session can be as short as 10 minutes, making it much quicker than conventional workouts.[25]

Cardiovascular training

Cardiovascular capacity can be measured using VO2 max, a measure of the amount of oxygen the body can uptake and utilize.[26] Cardiorespiratory training involves movement that increases the heart rate to improve the body's oxygen consumption. This form of exercise is an important part of all training regiments ranging from professional athletes to the everyday person. Also, it helps increase stamina.

Examples are:

Effects

Controlling blood pressure

Physical fitness has proven to result in positive effects on the body's blood pressure because staying active and exercising regularly builds up a stronger heart. The heart is the main organ in charge of systolic blood pressure and diastolic blood pressure. Engaging in a physical activity will create a rise in blood pressure, once the activity is stopped, however, the individual’s blood pressure will return to normal. The more physical activity that one engages in, the easier this process becomes, resulting in a more ‘fit’ individual.[28] Through regular physical fitness, the heart does not have to work as hard to create a rise in blood pressure, which lowers the force on the arteries, and lowers the over all blood pressure.[29]

Cancer prevention

Centers for disease control and prevention provide lifestyle guidelines of maintaining a balanced diet and engaging in physical activity to reduce the risk of disease. The WCRF/ American Institute for Cancer Research (AICR) published a list of recommendations that reflect the evidence they have found through consistency in fitness and dietary factors that directly relate to Cancer prevention.

The WCRF/AICR recommendations include the following:

These recommendations are also widely supported by the American Cancer Society. The guidelines have been evaluated and individuals that have higher guideline adherence scores substantially reduce cancer risk as well as help towards control with a multitude of chronic health problems. Regular physical activity is a factor that helps reduce an individual’s blood pressure and improves cholesterol levels, two key components that correlate with heart disease and Type 2 Diabetes.[31] The American Cancer Society encourages the public to "adopt a physically active lifestyle" by meeting the criteria in a variety of physical activities such as hiking, swimming, circuit training, resistance raining, lifting, etc. It is understood that cancer is not a disease that can be cured by physical fitness alone, however because it is a multifactorial disease, physical fitness is a controllable prevention. The large associations tied with being physically fit and reduced cancer risk are enough to provide a strategy to reduce cancer risk.[30] The American Cancer Society assorts different levels of activity ranging from moderate to vigorous to clarify the recommended time spent on a physical activity. These classifications of physical activity consider the intentional exercise and basic activities done on a daily basis and give the public a greater understanding by what fitness levels suffice as future disease prevention.

Inflammation

Studies have shown an association between increased physical activity and reduced inflammation.[32] It produces both a short-term inflammatory response and a long-term anti-inflammatory effect.[33] Physical activity reduces inflammation in conjunction with or independent of changes in body weight.[34] However, the mechanisms linking physical activity to inflammation are unknown.

Immune system

Physical activity boosts the immune system. This is dependent on the concentration of endogenous factors (such as sex hormones, metabolic hormones and growth hormones), body temperature, blood flow, hydration status and body position.[35] Physical activity has shown to increase the levels of natural killer (NK) cells, NK T cells, macrophages, neutrophils and eosinophils, complements, cytokines, antibodies and T cytotoxic cells.[36][37] However, the mechanism linking physical activity to immune system is not fully understood.

Cardiovascular disease prevention

Physical activity affects one’s blood pressure, cholesterol levels, blood lipid levels, blood clotting factors and the strength of blood vessels. All factors that directly correlate to cardiovascular disease. It also improves the body’s use of insulin. People who are at risk for diabetes, Type 2 (insulin resistant) especially, benefit greatly from physical activity because it activates a better usage of insulin and protects the heart. Those who develop diabetes have an increased risk of developing cardiovascular disease. In a study where a sample of around ten thousand adults from the Third National Health and Nutrition Examination Survey, physical activity and metabolic risk factors such as insulin resistance, inflammation, dyslipidemia were assessed. The study adjusted basic confounders with moderate/vigorous physical activity and the relation with CVD mortality. The results displayed physical activity being associated with a lower risk of CVD mortality that was independent of traditional metabolic risk factors.

The American Heart Association recommendations include the same findings as provided in the WCRF/ AICR recommendations list for people who are healthy. In regards to people with lower blood pressure or cholesterol, the association recommends that these individuals aim for around forty minutes of moderate to vigorous physical activity around three or four times a week.[38]

Weight control

Achieving resilience through physical fitness promotes a vast and complex range of health related benefits. Individuals who keep up physical fitness levels generally regulate their distribution of body fat and stay away from obesity. Abdominal fat, specifically visceral fat, is most directly affected by engaging in aerobic exercise. Strength training has been known to increase the amount of lean muscle in the body, however it can also reduce body fat.[39] Sex steroid hormones, insulin, and an appropriate immune response are factors that mediate metabolism in relation to the abdominal fat. Therefore, physical fitness provides weight control through regulation of these bodily functions.[40]

Neuropsychological effects

Regular exercise is effective for preventing the age-related decline in cognition and improving overall neuropsychological function. The increased synthesis of neurotrophic factors in the body and brain and the resulting neurogenesis in various brain structures is largely responsible for these effects. Exercise also has persistent antidepressant effects and has been found to serve as both a means to prevent and treat drug addictions, particularly psychostimulant addictions.

Menopause and physical fitness

Menopause is the term that is used to refer to the stretch of both before and after a woman's last menstrual cycle. there are an instrumental amount of symptoms connected to menopause, most of which can affect the quality of life of the women involved in this stage of her life. One way to reduce the severity of the symptoms is exercise and keeping a healthy level of fitness. Pre or during menopause as the women body changes there can be physical, physiological or internal changes to the body. These changes can be prevented or the reduced with the use of regular exercise. these changes include;[41]

-Prevention of weight gain: around menopause women tend to lose their muscle mass and have it replaced with abdominal fat. Slight increases in physical exercise can help to prevent this.

-Reduce the risk of breast cancer: due to the weight loss from regular exercise it may offer protection from breast cancer.

-Strengthen the bones of the body: Physical activity can slow the bone loss after menopause reducing the chance of bone fractures and osteoporosis.

-Reduce the risk of disease: Excess weight can increase the risk of heart disease and type 2 diabetes, and the regular physical activity can counter these effects.

-Boost the mood: By being involved in regular activities it can improve the psychological health, this can be the case at any age and not only for times during or after menopause.[42]

The Melbourne Women’s Midlife Health Project provided evidence that showed over an eight-year time period 438 were followed. even though the physical activity was not associated with VMS in this cohort at the beginning. women that reported they were physically active everyday at the beginning were 49% less likely to have reported bothersome hot flushes. this in contrast to women who level of activity decreased were more likely to experience bothersome hot flushes.[43]

See also

References

  1. Tremblay, Mark Stephen; Colley, Rachel Christine; Saunders, Travis John; Healy, Genevieve Nissa; Owen, Neville (2010). "Physiological and health implications of a sedentary lifestyle". Applied Physiology, Nutrition, and Metabolism 35 (6): 725–740. doi:10.1139/H10-079.
  2. de Groot, Gudrun Cathrine Lindgren; Fagerström, Lisbeth (June 14, 2010). "Older adults' motivating factors and barriers to exercise to prevent falls". Scandinavian Journal of Occupational Therapy 18 (2): 153–160. doi:10.3109/11038128.2010.487113. PMID 20545467.
  3. Malina, R (2010). Physical activity and health of youth. Constanta: Ovidius University Annals, Series Physical Education and Sport/Science, Movement and Health.
  4. "President's Council on Physical Fitness and Sports Definitions for Health, Fitness, and Physical Activity". fitness.gov. Archived from the original on 12 July 2012.
  5. "Google Ngram Viewer". Google.
  6. Glassman, Greg (1 October 2002). "What is Fitness?". CrossFit Journal.
  7. Colfer, George R. (19 January 2004). "Skill-related physical fitness essential for sports success". tradoc.army.mil. Archived from the original on June 2011.
  8. Nied, R. J.; Franklin, B (2002). "Promoting and prescribing exercise for the elderly". American family physician 65 (3): 419–26. PMID 11858624.
  9. "Exercise for Your Bone Health". nih.gov.
  10. 4177.0 – Participation in Sport and Physical Recreation, Australia, 2011–12. Australian Bureau of Statistics. 19 December 2012
  11. Physical Activity Fundamental To Preventing Disease. U.S. Department of Health & Human Services. 20 June 2002
  12. "How much physical activity do adults need?". Centers for Disease Control and Prevention. 1 December 2011. Retrieved 29 April 2013.
  13. Pedersen, B. K.; Febbraio, M. A. (2012). "Muscles, exercise and obesity: Skeletal muscle as a secretory organ". Nature Reviews Endocrinology 8 (8): 457–65. doi:10.1038/nrendo.2012.49. PMID 22473333.
  14. Physical Activity Guidelines for Americans. Office of Disease Prevention and Health Promotion. 2008
  15. Mackenzie, B (2001). "Middle Distance Running". Middle Distance Running. BrianMac Sports Coach.
  16. Training: Physical Fitness Program. sccfd.org
  17. "Enlist : Army Physical Fitness Test". Army.com. Archived from the original on 6 January 2010.
  18. "Running on the Beach: The Benefits & Dangers | Runners Feed". runnersfeed.com. Retrieved 2015-04-14.
  19. Harriman, Dan (28 January 2015). "Aqua Jogging for Runners". livestrong.com.
  20. Swimming Anatomy, Publisher: Human Kinetics, Year: 2010, ISBN 9781450409179, page: 147
  21. Blair, S. N. (1993). "1993 C.H. Mc Cloy Research Lecture: Physical activity, physical fitness, and health". Research Quarterly for Exercise and Sport 64 (4): 365–76. doi:10.1080/02701367.1993.10607589. PMID 8278662.
  22. Wisløff, U; Ellingsen, Øyvind; Kemi, O. J. (2009). "High-intensity interval training to maximize cardiac benefits of exercise training?". Exercise and Sport Sciences Reviews 37 (3): 139–46. doi:10.1097/JES.0b013e3181aa65fc. PMID 19550205.
  23. Gillen, J. B.; Gibala, M. J. (2014). "Is high-intensity interval training a time-efficient exercise strategy to improve health and fitness?". Applied Physiology, Nutrition, and Metabolism 39 (3): 409. doi:10.1139/apnm-2013-0187.
  24. Shiraev, T; Barclay, G (2012). "Evidence based exercise – clinical benefits of high intensity interval training". Australian family physician 41 (12): 960–2. PMID 23210120.
  25. Whitehurst, M. (2012). "High-intensity interval training: An alternative for older adults". American Journal of Lifestyle Medicine 6 (5): 382–386. doi:10.1177/1559827612450262.
  26. Haskell, W. L.; Troiano, R. P.; Hammond, J. A.; Phillips, M. J.; Strader, L. C.; Marquez, D. X.; Grant, S. F.; Ramos, E. (2012). "Physical Activity and Physical Fitness". American Journal of Preventive Medicine 42 (5): 486. doi:10.1016/j.amepre.2011.11.017. PMID 22516489.
  27. Osawa, Y; Azuma, K; Tabata, S; Katsukawa, F; Ishida, H; Oguma, Y; Kawai, T; Itoh, H; Okuda, S; Matsumoto, H (2014). "Effects of 16-week high-intensity interval training using upper and lower body ergometers on aerobic fitness and morphological changes in healthy men: A preliminary study". Open Access Journal of Sports Medicine 5: 257–65. doi:10.2147/OAJSM.S68932. PMC 4226445. PMID 25395872.
  28. Exercise: A Drug-free Approach to Lowering High Blood Pressure. mayoclinic.org.
  29. Blood Pressure : Exercise & Activity Lower Blood Pressure. bloodpressureuk.org
  30. 1 2 Alberts, David S. and Hess, Lisa M. (2005). Fundamentals of Cancer Prevention. Berlin: Springer, ISBN 364238983X.
  31. U.S. Department of Health and Human Services. Physical Activity and Health: A Report of the Surgeon General. Atlanta, GA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, 1996.
  32. Colbert, Lisa H.; Visser, Marjolein; Simonsick, Eleanor M.; Tracy, Russell P.; Newman, Anne B.; Kritchevsky, Stephen B.; Pahor, Marco; Taaffe, Dennis R.; Brach, Jennifer (2004-07-01). "Physical activity, exercise, and inflammatory markers in older adults: findings from the Health, Aging and Body Composition Study". Journal of the American Geriatrics Society 52 (7): 1098–1104. doi:10.1111/j.1532-5415.2004.52307.x. ISSN 0002-8614. PMID 15209647.
  33. Kasapis, Christos; Thompson, Paul D. (2005-05-17). "The effects of physical activity on serum C-reactive protein and inflammatory markers: a systematic review". Journal of the American College of Cardiology 45 (10): 1563–1569. doi:10.1016/j.jacc.2004.12.077. ISSN 0735-1097. PMID 15893167.
  34. Campbell, Kristin L.; McTiernan, Anne (2007-01-01). "Exercise and biomarkers for cancer prevention studies". The Journal of Nutrition 137 (1 Suppl): 161S–169S. ISSN 0022-3166. PMID 17182820.
  35. Nieman, DC (March 18, 1997). "Exercise immunology: practical applications.". Int J Sports Med.
  36. Fairey, Adrian S.; Courneya, Kerry S.; Field, Catherine J.; Mackey, John R. (2002-01-15). "Physical exercise and immune system function in cancer survivors: a comprehensive review and future directions". Cancer 94 (2): 539–551. doi:10.1002/cncr.10244. ISSN 0008-543X. PMID 11900239.
  37. Kruijsen-Jaarsma, Mirjam; Révész, Dóra; Bierings, Marc B.; Buffart, Laurien M.; Takken, Tim (2013-01-01). "Effects of exercise on immune function in patients with cancer: a systematic review". Exercise Immunology Review 19: 120–143. ISSN 1077-5552. PMID 23977724.
  38. "Physical Activity and Blood Pressure." heart.org.
  39. Westcott, W.L.; La Rosa Loud, R. (2014). "Strength for fat loss training". American Fitness 32 (1): 18–22.
  40. Westerlind, K. C. (2003). "Physical activity and cancer prevention—mechanisms". Medicine & Science in Sports & Exercise 35 (11): 1834–40. doi:10.1249/01.MSS.0000093619.37805.B7. PMID 14600547.
  41. Sternfeld, B.; Dugan, S. (2011). "Physical Activity and Health During the Menopausal Transition". Obstetrics and Gynecology Clinics of North America 38 (3): 537. doi:10.1016/j.ogc.2011.05.008. PMID 21961719.
  42. Pruthi, Sandhya (June 2013). "Fitness Tips for Menopause: Why fitness counts". Mayo Clinic. Mayo Clinic. Retrieved 11 April 2015.
  43. Eschbach, Chris (January 12, 2012). "Exercise Recommendations for Menopause-Aged Women". American College of Sports Medicine. American College of Sports Medicine. Retrieved 12 April 2015.

Further reading

External links

Wikimedia Commons has media related to Fitness.
This article is issued from Wikipedia - version of the Wednesday, May 04, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.