Causes of Muscle Damage

Causes of Muscle Damage An antioxidant has been defined as a substance that reduces oxidative damage such as that caused by free radicals (Halliwell 1984). Oxygen-centred free radicals known as Reactive Oxygen Species (ROS) may contribute to exercise induced muscle damage (Mc Ginley 2009). Due to this, it has been widely accepted over the past 20 years that increasing antioxidants in the body will provide greater protection against ROS (Sastre 1992; Hathcock 2005). However, the significance of exercise-induced oxidative stress is open for discussion (Cabrera 2008) with unclear conclusions in literature. This has led to the recent investigation on the possibility of increased production of free radicals during exercise and the effects of antioxidant supplementation in athletes (Finaud 2006; Gomez-Cabrera 2008;Ristow 2009). Free radical proliferation is a widely suggested mechanism in the damage response to exercise by process of phacocytosis and activation of the respiratory burst by neutrophils during the i nflammatory response (Pyne 1994). The most commonly used antioxidants in the sporting world are vitamin C (ascorbic acid) and vitamin E (tocopherol) with an astonishing 84% of athletes using antioxidants during the 2008 Beijing Olympics (International Olympic Committee 2008). It has been well documented that high intensity exercise results in damage to active muscle fibres resulting in soreness, stiffness and a reduction in the muscles force producing capabilities (Allen 2001; Armstrong 1990; Clarkson 2002). Peroxidation of muscle fibre lipids causes disturbance in cellular homeostasis which may result in muscle fatigue or injury, possibly implicating free radical formation as a major cause of delayed-onset muscle soreness (Byrd 1992). Preventing muscle tissue damage during exercise training may help optimize the training effect and eventual competitive sports performance (Sen 2001). In order to minimise tissue cell damage, there must be an equilibrium maintained between oxidants (ROS) and antioxidants (reductants). ROS increases with intense physical exercise (Fig 1) which can exceed the capacity of the bodys natural antioxidant defence (Reid 2001). This was illustrated by Davis (1982) and Ebbeling (1990), whereby strenuous activity led to increased lev els of malondialdehyde (MDA), a 3-carbon-chain aldehyde. Measurement of MDA has become the most commonly used indicator of lipid peroxidation (Mc Bride 1999).Thus, the ingestion of exogenous antioxidants has been proposed to attenuate this increase in ROS. Evans (1990) noted that several antioxidants, including vitamin C and especially vitamin E, have been shown to decrease the exercise-induced increase in the rate of lipid peroxidation, which could help prevent muscle tissue damage. The effects of Vitamin E have been more extensively researched than Vitamin C due to some promising results in the literature. Vitamin E is the main lipidsoluble, chain-breaking antioxidant (Ji 1996) which accumulates in the phospholipid bilayer of cell membranes and helps attenuate lipid peroxidation (Sjodin 1990) within the cell membrane acting as an important scavenger of superoxide and lipid radicals (Powers 2000). Vitamin E supplementation has been shown to significantly decrease the amount of lipid peroxidation (Kanter 1993) and membrane damage associated with single bouts of low and high intensity submaximal exercise aswell as resistance exercise (Mc Bride 1998; Ashton 1999). Sumida (1989) stated that 300 mg of vitamin E given for 4 weeks reduced exercise-induced lipid peroxidation . Mc Bride (1998) reported the effectiveness of vitamin E supplementation in reducing MDA and creatine kinase (CK) levels. Cannon (1990) reported a decrease in CK and a faster recovery after supplem entation of vitamin E. Furthermore, Kanter (1997) recently reported a 35 % increase in T-lag time (indicative of a diminished LDL oxidation rate) in subjects who consumed 1000 mg d-a-tocopherol acetate daily for 1 week before exercise. Various studies have also demonstrated beneficial physiological effects of vitamin C supplementation in physically-active people. Jakeman and Maxwell (1993) found that supplementing vitamin C showed less strength loss (Fig 2) in the triceps surae post-exercise, and a faster recovery (Fig 3) compared to placebo. The force response to tetanic stimulation was less in the vitamin C group also, indicating a reduction in contractile function. Kaminski and Boal (1992) pre-supplemented subjects for 3 days with 1 g of vitamin C 3 times a day and then induced damage in the posterior calf muscles. Supplementation continued for 7 days post-exercise with vitamin C group reporting reduced soreness ratings ranging from 25-44% less than the control group. Peters (1993) noted fewer cases of upper respiratory tract infection in runners who consumed 600 mg vitamin C/d for 3 weeks before a 42 km road race. Bryer (2006) reported lower DOMS in a high-dose Vitamin C supplementation group 2 weeks prior and 4 days post eccentric exercise Studies which have used combinations of antioxidants (consumed 300-800 mg d-cr-tocopherol plus 200 mg vitamin C/d for 4-8 weeks) reported post-exercise declines in serum enzymes indicative of muscle tissue damage in subjects (Sumida 1989; Rokitzi 1994). Kanter (1993) reported that a mixture of vitamin E (592 mg), vitamin C (1,000 mg), and 30 mg of beta carotene resulted in a decreased level of a lipid peroxidation marker after exercise. All the previously mentioned studies suggest tangible benefits of antioxidant supplementation in combating detrimental physiological processes that may be initiated by physical activity thus appearing beneficial to sports and exercise participants. Exercise exhibits numerous positive effects on general health (Wartburton 2006), most notably improving glucose metabolism. It is well documented that exercise increases ROS production (Powers 2008), however it is unknown whether this may influence the health promoting effects of exercise. The effects of antioxidant supplementation on the health-promoting effects of exercise have recently been investigated (Gomez-Cabrera 2008; Ristow 2009). Exercise helps initiate mitochondrial metabolism, with a reduction of this metabolism linked with type 2 diabetes (Simoneau 1997). Since mitochondria are the main source of ROS, its been proclaimed that ROS may be a factor in some health promoting effects (Schulz 2007; Birringer 2007). Ristow (2009) investigated this theory and hypothesized that antioxidant supplementation may repeal certain health promoting benefits of exercise and oxidative stress. Thus, if increases in oxidative stress exhibit a counteracting effect on insulin-resistance, then the prevention of ROS activation by antioxidants may increase the risk of disease such as type 2 diabetes. Ristow (2009) proposed an essential role for ROS formation in increasing insulin sensitivity in exercising humans. The study found that vitamin C and vitamin E blocked many of the beneficial effects of exercise such as insulin sensitivity (glucose infusion rates-GIR) and the promotion of muscle antioxidant defence post-exercise. James (1984) found non-supplemented subjects showed significant increase in GIR after 4 weeks training whereas antioxidant group found no significant change (Fig 4). In addition, the non supplemented group also increased adiponectin levels compared to the supplemented group (Fig 5). Adiponectin (secretory protein) has been shown to have a positive correlation with insulin sensitivity and is inversely correlated with risk of type 2 diabetes (Spranger 2003). A recent meta-analysis of 232,550 participants suggests use of antioxidants may increase all-cause mortality (Bjelakovic 2007). Of the 136,023 receiving antioxidants, 13.1% died (17,880) whereas of the 96,5 27 controls, 10.5% died (10,136). Studies in healthy subjects show that low aerobic capacity is a strong predictor of mortality (Myers 2002; Yusuf 2004). Impaired regulation of mitochondrial function is an important mechanism for low aerobic capacity (Wisloff 2005). Gomez-Cabrera (2008) found that mitochondrial content is a key determinant of endurance capacity and that vitamin C decreases exercise-induced mitochondrial biogenesis in muscle. Free radicals serve as signals to adapt muscle cells to exercise through gene expression (Khassaf 2003). Vitamin C was found to prevent beneficial training effects to occur due to their prevention of activation of two major antioxidants (Mn-SOD and GPx) (Gomez-Cabrera 2008). The aforementioned study also concluded that endurance capacity is directly related to mitochondrial content, which is negatively affected by antioxidants. Antioxidant supplementation is extremely popular among athletes, but data indicating beneficial effects on functional capacity of muscle are elusive. There is no strong evidence from literature for the use of antioxidant supplementation in athletic populations as there are many poor controlled studies involving unusually high doses, involving low muscle damaging activity and more recent research has alleviated to minimal if any benefits. Antioxidants do not seem beneficial in preventing DOMS, increasing recovery time or protect against muscle damage but in fact long term supplementation (with vitamin E in particular) may increase mortality (Bjelakovic 2007). Most notably for athletes, not only does supplementation appear ineffective in preventing against exercise induced muscle damage, but interferes with the ROS signalling which are needed for adaptation to occur (Gomez-Cabrera 2008). References: Allen DG (2001). Eccentric muscle damage: mechanisms of early reduction of force. Acta Physiol Scand; 171(3):311-9 Aoi W, Naito Y, Takanami Y, Kawai Y, Sakuma K, Ichikawa H (2004). Oxidative stress and delayed-onset muscle damage after exercise. Free Radic Biol Med;37:480- 7. Armstrong RB (1990). Initial events in exercise-induced muscular injury. Med Sci Sports Exerc; 22(4): 429-35 Ashton T, Young IS, Peters JR, Jones E, Jackson SK, Davies B (1999). Electron spin resonance spectroscopy, exercise, and oxidative stress: an ascorbic acid intervention study. J Appl Physiol;87:2032- 6 Birringer M, et al. (2007) Improved glucose metabolism in mice lacking alphatocopherol transfer protein. Eur J Nutr 46:397-405. Bjelakovic G, Nikolova D, Gluud LL, Simonetti RG, Gluud C (2007) Mortality in randomized trials of antioxidant supplements for primary and secondary prevention: Systematic review and meta-analysis. J Am Med Assoc 297:842-857. Bryer SC, Goldfarb AH (2006). Effect of high dose vitamin C supplementation on muscle soreness, damage, function and oxidative stress to eccentric exercise. Int J Sport Nutr Exerc Metab; 16(3): 270-80 Byrd, S.K.(1992) Alterations in the sarcoplasmic reticulum: A possible link to exercise-induced muscle damage. Med. Sci. Sports Exerc. 24:531-536 Cannon, J.G, Evans W.J (1990). Acute phase response in exercise: Interaction of age and vitamin E on neutrophils and muscle enzyme release. Am. J. Physiol. 259:R1214-R1219. Clarkson PM, Hubal MJ (2002). Exercise-induced muscle damage in humans. Am J Phys Med Rehabil; 81(11): S52-59 Davies, K.J, BROOKS G.A, and Packer L (1982). Free radicals and tissue damage produced by exercise. Biochem. Biophys. Res. Commun. 107:1198-1205. Dillard CJ, Litov RE, Savin RE, Dumelin EE Tappel AL (1978) Effects of exercise, vitamin E, and ozone on pulmonary function and lipid peroxidation. Journal of Applied Physiology Ebbeling, C.B, and Clarkson P.M(1990). Muscle adaptation prior to recovery following eccentric exercise. Eur. J. Appl. Physiol. 60: 26-31. Finaud J, Lac G, Filaire E (2006). Oxidative Stress: relationship with exercise and training. Sports Med;36(4):327-58 Gomez-Cabrera MC, Domenech E (2008). Moderate exercise is an antioxidant: upregulation of antioxidant genes by training. Free Radic Biol Med; 44(2): 126-31 Gomez-Cabrera MC, et al. (2008) Oral administration of vitamin C decreases muscle mitochondrial biogenesis and hampers training-induced adaptations in endurance performance. Am J Clin Nutr 87:142-149. Halliwell, B., Gutteridge J. M (1984). Oxygen toxicity, oxygen radicals, transition metals and disease. J. Biochem. 219:1-14. Hartmann A, Nies AM, Grunert-Fuchs M, Poch B Speit G (1995) Vitamin E prevents exercise-induced DNA damage. Mutation Research 346, 195-202. Hathcock JN, Azzi A, Blumberg J (2005). Vitamins E andCare safe across a broad range of intakes. Am J Clin Nutr;81:736-45 Hellsten, Y, Sjodin B (1997) Xanthine oxidase in human skeletal muscle following eccentric exercise: A role in inflammation. J. Physiol. 498: 239-248. James DE, Kraegen EW, Chisholm DJ (1984) Effect of exercise training on whole-body insulin sensitivity and responsiveness. J Appl Physiol 56:1217-1222. Ji, L.L (1996). Exercise, oxidative stress, and antioxidants. Am. J. Sports Med. 24:S20-S24. Ji, L.L. (2000) Free radicals and antioxidants in exercise and sports. G.E. Garrett, and D.T. Kirkendall. Exercise and Sport Science. New York, NY: Lippincott Williams and Wilkins. pp. 299- 317. Kaminski, M, Boal M (1992). An effect of ascorbic acid on delayed- onset muscle soreness. Pain 50:317-321. Kanter MM, Bartoli WP, Eddy DE Horn MK (1997) Effects of short term vitamin E supplementation on lipid peroxidation, inflammation and tissue damage during and following exercise. Medicine and Science in Sports and Exercise 29, S40. Kanter, M.M., Nolte L ,and Holloszy H (1993). Effects of an antioxidant vitamin mixture on lipid peroxidation at rest and postexercise. J. Appl. Physiol. 74:965-969. Kanter, M.M., Nolte L.A and Holloszy J.O (1993). Effects of an antioxidant vitamin mixture on lipid peroxidation at rest and post-exercise. J. Appl. Physiol. 74:965-969. Khassaf M, McArdle A, Esanu C (2003). Effect of vitamin C supplements on antioxidant defence and stress proteins in human lymphocytes and skeletal muscle. J Physiol;549:645-52. Kosmidou I, Vassilakopoulos T, Xagorari A, Zakynthinos S, Papapetropoulos A, Roussos C (2002). Production of interleukin-6 by skeletal muscle myotubes. Role of reactive oxygen species. Am J Respir Cell Mol Biol;26:587- 93. Maxwell SRJ, Jakeman P, Thomason H, (1993). Changes in plasma antioxidant status during eccentric exercise and the effect of vitamin supplementation. Free Radic Res Commun;19:191-202. McBride, J.M., and Kraemer W.J (1998) Effect of resistance exercise on free radical production. Med. Sci. Sports Exerc. 30:67-72. McBride, J.M., and Kraemer W.J (1999). Free radicals, exercise, and antioxidants. J. Strength Cond. Res. 13:175-183. Myers J, Prakash M, Froelicher V, Do D, Partington S, Atwood JE (2002). Exercise capacity and mortality among men referred for exercise testing. N Engl J Med;346:793- 801. Powers SK, Jackson MJ (2008) Exercise-induced oxidative stress: Cellular mechanisms and impact on muscle force production. Physiol Rev 88:1243-1276. Pyne, D.B (1994). Regulation of neutrophil function during exercise. Sports Med. 17:245-258. Reid, M.B, Shoji T,Moody M.R, and Entman M.L.(1992) Reactive oxygen in skeletal muscle. II. Extracellular release of free radicals.J. Appl. Physiol. 73:1805-1809. Ristow, M., Zarse, K., Oberbach, A., Kloting, N., Birringer, M., Kiehntopf, M. Stumvoll, M., Kahn, C.R., Bluher, M. (2009). Antioxidants prevent health-promoting effects of physical exercise in humans. Proceedings of the National Academy of Sciences of the United States of America, 106, 8665-8670. Rokitzi L, Logemann E, Sagredos AN, Wetzel-Roth W Keul J (1994) Lipid peroxidation and antioxidative vitamins under extreme endurance stress. Acta Physiologica Scandinavica 154, 149-154. Sastre J, Asensi M, Gasco E (1992). Exhaustive physical exercise causes oxidation of glutathione status in blood: prevention by antioxidant administration. Am J Physiol;263:R992-5. Schulz TJ, et al. (2007) Glucose restriction extends Caenorhabditis elegans life span by inducing mitochondrial respiration and increasing oxidative stress. Cell Metab 6:280-293. Sen, C, K (2001). Antioxidants in Exercise. Nutrition Journal of Sports Medicine- Volume 31 Issue 13 pp 891-908 Simoneau JA, Kelley DE (1997) Altered glycolytic and oxidative capacities of skeletal muscle contribute to insulin resistance in NIDDM. J Appl Physiol 83:166-171. Sjodin, B., Y. And Apple F.S (1990). Biochemical mechanisms for oxygen free radical formation during exercise. Sports Med. 10:236-254. Spranger J, et al. 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Pygmalion: Social Class and Liza

1. Significance of Title: The significance of the title, †Pygmalion† is in Greek mythology, The town Cyprus Pygmalion was a king who deeply fell in love with the statue of Aphrodite. Pygmalion had pictured nothing but beauty in his mind. He worked many countless days and nights in search of loveliness beyond his powers of expression. The statue got the life, in his quest for ideal beauty and divine’s grace. Over time the two were married and he gave her the name Galatea. In contrast to Shaw’s play, â€Å"Pygmalion† professor Higgins the scientist of phonetics is a Pygmalion and a convent garden flower girl Eliza is a Galatea the statue, who will be later transformed by Higgins into an upper class lady. Though Higgins creates a new Liza, he doesn’t marry her unlike the Greek legend. The title has mythic and suggestive appeal to it. 2. Setting: The setting of Pygmalion is set in England around the late 1800s and early 1900s. Why Shaw chose this setting, it is when and where he lived, but it is important to the story in many ways. He was an active socialist, in many of his novels they were based on social and political issues like capitalism and socialism. In Pygmalion, Shaw lays down his beliefs and teaches us about society in the early 1900s. This was a time when people were just starting to be able to move up in society, if you were poor at birth, you could raise yourself to a higher level by working hard, like Liza. Women were finally starting to be considered more than just the homebuilders; they were starting to be viewed as the heart of the family. Shaw supported the idea that women should get the same opportunities as men, also he believed strongly in equality for all mankind. In this story it tells about a working young lady who gets an opportunity to become upper class lady. Throughout the novel, Shaw keeps the contrast between working class and the middle class by using strong characters from both sectors. The setting provides events and opinions from both sides of class divided. When the two different worlds are clashed together the results are interesting. England is also a major part of the setting, because it had a more rigid social structure at the time of the story than America did. It was easier to spot the differences that kept Liza stapled to the gutter of society. 3. Theme: There are many themes in this novel. One of themes is Professionalism, the idea of female professions were somewhat new, in this time period. Women were generally housewives before this period and there is some resistance to the idea of that male professions being entered by females. When Liza opening a flower shop and she comes from the lower class, it’s almost treating to the males because it’s one job that the female took away from them. Gentility and Manners is another theme. The upper class was associated with mostly good manners. The author’s position on manners was a bit unclear. Since he’s a socialist, a person might think he wouldn’t have no time for them because they are a maker of class divisions. Though Pickering’s treating everyone like a duchess, while Higgins’s pattern is treating everyone like trash. At the end of the novel Liza thanks Pickering for teaching her manners; if it wasn’t for him she would have never learned them. Change and Transformation is also another theme. The central theme and plot of the novel is the transformation of Liza. At first it appears to rest in the power Higgins expresses buy achieving his transformation. He quotes, â€Å"How frightfully interesting it is to take a human being and change her into a quite different human being by creating a new speech for her.† Liza becomes the central in the play. The learning of independence and the sense of inner self-worth is the true importance that allows her to leave Higgins. 4. Characters: Liza Doolittle is around eighteen and twenty years of age, a cockney flower girl who is energetic and street-smart. She is intelligent though was not educated by the traditional standards. Innocent vanity and consequential air describe the deplorable figure. Liza is a quick learner, who learns a genteel accent from Higgins’s and washed and dressed exquisitely as a duchess. As she is transformed, she is shocked that Higgins has lost interest in her afterwards. Liza notices the difference between a flower girl and a lady and she learns that the social graces and class not the true measure of a person’s worth. Henry Higgins is described as, â€Å"a robust, vital appetizing sort of man†, also an energetic scientific type. He is an expert in the phonetics and the author of, â€Å"Higgins’s Universal Alphabet.† His manners range from genial bullying. When he transformed Liza, he is shaken by the independence Liza demonstrates and by the end of the play Higgins is able to respect her. Another character is Alfred Doolittle is an elderly but vigorous man. He thinks he deserves as much as others Though never gets anything because the disapproval of middle class morality. Alfred is a moocher that finesses loans from the most miserly of people. 5. Conflicts: There are several conflicts in this play. Higgins and Colonel Pickering have a playful â€Å"bet† that Higgins can't make the flower girl speak and act like a duchess. There is the issue of what we actually hear and say as opposed to what we think we hear and say. Higgins transforms the flower girl into an upper class duchess, and this is why Higgins forgets about her as soon as transformed her because he won the bet. Another conflict was that Liza Doolittle wants to better herself in life, than just be a lower class flower girl but is rather stuck in her position since her income fluctuates and her education is limited. This conflict is solved when Liza decides to open her own flower show, because that is what she knows how to do. Plus she enjoys it. 6. Symbolism and Imagery: One of the symbols in this play is chocolate. Higgins loves chocolate; while he does his studies he displays them on desk. He tried to Convince her Liza to be transformed into a duchess, he lures her with chocolate. She takes a bite of half of one. Before she can reply he pops one in his mouth. In the chocolate dish before leaving his house, Liza leaves a sentimental ring given to her by him. Liza taking a bite of chocolate represents trust. Money would be another symbol because it defines the difference between lower, middle, upper class depending how much money you have. The ring is also another symbol. Usually a ring symbolizes love and marriage though Higgins and Liza were never together; she leaves the ring by the chocolate dish. This indicates that she doesn’t trust him no more, since she left the ring by the chocolates and that she doesn’t have any more feelings for him. Eliza has now moved on. 7. Author’s style: Shaw’s style in his novel, â€Å"Pygmalion† is Intellect vs. Entertainment Shaw not only wants to just entertain his audience, he also wants them to learn about social issues. Usually theatre plays are strictly to just entertain; Shaw adds his own twist to it (to learn as well). Rather than dramatic tension, his plays do tend toward discussion. Shaw understood what made plays theatrical that’s why he succeeded in his plays. His belief in the need for social improvement didn’t however discourage him for adding humor into his plays. Pygmalion most people would think that his novel would have to do with romance but it doesn’t at all. After reading the novel you might interpret that it is a romance novel, because Eliza and Higgins. Romance has been distinguished as exotic, exaggerated narratives and idealized characters. And Pygmalion is a romance not the typical one but because of the magical transformation throughout the play . 8. Key Quotations:† A woman who utters such depressing and disgusting sounds has no right to be anywhere – no right to live† (Act.1 ) By this quote Higgins does accept all the class divisions. He believes that since Liza didn’t inherit in being an upper class lady, only he can bestow worth upon her, by helping her become a lady in society’s eyes. †You don’t care. I know you don’t care. You wouldn’t care if I was dead. I’m nothing to you-not so much as them slippers† (Act4 pg64) This shows Liza’s transformation and how it changed her, they even though she completely changed in appearance deep down she is nothing like Higgins or any upper class person. She has a different way of explaining things and she wants to be her own person, but still use the traits of an upper class lady. â€Å"You are certainly are a pretty pair of babies, playing with your live doll†(Act3 pg.53) Mrs. Higgins doesn’t agree with what her husband is doing with Liza, at first she was somewhat okay with the idea, but now she thinks it’s wrong because he going to have nothing to do with her afterwards.

Native American History Native Americans - 1879 Words

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Is Climate Change Not A Top Priority Essay - 1197 Words

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The recent election of Donald Trump to president is what made me decide on this question. In the wake of his election, many people have expressed concern for environmental agenda and climate change regulation-- and for good reason too. To start, Donald Trump himself tweeted â€Å"The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.† He tweeted that in 2012, and while he may have been joking-- or even changed his mind-- it gets worse. According to the Washington Post, Trump â€Å"has vowed to roll back Obama’s signatureShow MoreRelatedGlobal Climate Change Should Be A Top Priority For All Of Us1783 Words   |  8 Pageslive. The global climate change is affecting all of us in general. People are in denial and think that it doesn’t exist or that scientists made it up. In reality it is happening and more and more evidence is showing that if we don’t start to do something about it we can destroy the planet. 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