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Article

Comparison of Force Exertion Characteristics of Sustained Hand Grip and Toe Grip

1National Defense Academy of Japan, 1-10-20 Hashirimizu, Yokosuka, Kanagawa, Japan

2Graduate School of Natural Science & Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa, Japan


American Journal of Sports Science and Medicine. 2013, 1(2), 28-32
DOI: 10.12691/ajssm-1-2-3
Copyright © 2013 Science and Education Publishing

Cite this paper:
Masakatsu Nakada, Shinichi Demura. Comparison of Force Exertion Characteristics of Sustained Hand Grip and Toe Grip. American Journal of Sports Science and Medicine. 2013; 1(2):28-32. doi: 10.12691/ajssm-1-2-3.

Correspondence to: Masakatsu Nakada, National Defense Academy of Japan, 1-10-20 Hashirimizu, Yokosuka, Kanagawa, Japan. Email: nakada@nda.ac.jp

Abstract

This study aimed to examine the differences in decreasing force during maximal sustained hand grip and toe grip exertions values. Fourteen males aged 18 to 22 years old performed hand and toe grip exertions for 6min. The sustained times of forces 40, 60, 70, and 80% of maximal strength (max), strength values at 90sec and 3min, and final strength value (% of max) were selected as evaluation parameters. The forces (% max) during both sustained grip exertions markedly decreased until about 60sec from their exertion onset, after which they slowly decreased, then decreased very little at 4-6min. Toe grip exertion values were significantly larger than hand grip exertion values until after 60sec from exertion onset (about 15% ~ 20% vs about 30% ~ 35%). Correlations among sustained time parameters (60%~80% max) were significant (r =0.657~0.960). The strength at 3 min in toe grip exertion significantly correlated to final strength, sustained time of forces 40% of max, and strength at 90sec. In summary, the forces during sustained hand grip and toe grip exertions show a similar decreasing tendency, but the latter’s exertion values maintain a higher level than the former’s after a marked decrease. The strength value at 3min for toe grip exertion may be useful as muscle endurance parameter.

Keywords

References

[[[[[[[[[
[[1]  Yamaji, S., Demura, S., Nagasawa, Y., Nakada, M. and Kitabayashi, T., “The effect of measurement time when evaluating static muscle endurance during sustained static maximal gripping.” J Physiol Anthropol Appl Human Sci. 21. 151-158. 2002.
 
[[2]  Yamaji, S., Demura, S., Nagasawa, Y. and Nakada, M., “The influence of different target values and measurement times on the decreasing force curve during sustained static gripping work.” J Physiol Anthropol. 25. 23-28. 2006.
 
[[3]  Shyam Kumar, A. J., Parmar, V., Ahmed, S., Kar, S. and Harper, W. M.,“A study of grip endurance and strengh in different elbow positions.”J Orthop Traumatol. 9. 209-211. 2008.
 
[[4]  Menz, H. B., Zammit, G. V., Munteanu, S. E. and Scott, G., “Plantarflexion strength of the toes: age and gender differences and evaluation of a clinical screening test.” Foot Ankle Int. 27. 1103-1108. 2006.
 
[[5]  Scott, G., Menz, H. B. and Newcombe, L., “Age-related differences in foot structure and function.” Gait Posture. 26. 68-75. 2007.
 
Show More References
[6]  Yamaji, S., Demura, S., Nagasawa, Y. and Nakada, M., “Relationships between decreasing force and muscle oxygenation kinetics during sustained static gripping.” J Physiol Anthropol Appl Human Sci. 23. 41-47. 2004.
 
[7]  Yamaji, S., Demura, S., Nagasawa, Y., Nakada, M., Yoshimura, Y., Matsuzawa, Z. and Toyoshima, Y., “Examination of the parameters of static muscle endurance on sustained static maximal hand gripping.” Japan J Phys Educ. 45. 695-706. 2000. [In Japanese with English Abstract].
 
[8]  Nakada, M. and Demura, S., “The change of exertion force during sustained toe grip exertion and the relationships among toe muscle endurance parameters.” J Educ Health Sci. 57. 253-257. 2012. [In Japanese with English Abstract].
 
[9]  Demura, S., Sato, S. and Nagasawa, Y., “Re-examination of useful items for determining hand dominance.” Gazz Med Ital – Arch Sci Med. 168. 169-177. 2009.
 
[10]  Demura, S., Sato, S. and Sugiura, H., “Lower limb laterality characteristics based on the relationship between activities and individual laterality.” Gazz Med Ital – Arch Sci Med. 169. 181-191. 2010.
 
[11]  Nakada, M., Demura, S., Yamaji, S. and Nagasawa, Y., “Examination of the reproducibility of grip force and muscle oxygenation kinetics on maximal repeated rhythmic grip exertion.” J Physiol Anthropol Appl Human Sci. 24. 1-6. 2005.
 
[12]  Miyata, H., Sadoyama, T. and Katsuta, S., “Muscle fiber conduction velocity in human vastus lateralis during isometric contractions: relation to muscle fiber composition.” J physical Fitness Japan. 34. 231-238. 1985. [In Japanese with English Abstract].
 
[13]  Ordway, G. A., Kearney, J. T. and Stull, G. A., “Rhythmic isometric fatigue patterns of the elbow flexors and knee extensors.” Res Q. 48. 734-740. 1977.
 
[14]  Samson, M. M., Meeuwsen, I. B., Crowe, A., Dessens, J. A., Duursma, S. A. and Verhaar, H. J., “Relationships between physical performance measures, age, height and body weight in healthy adults.” Age Ageing. 29. 235-242. 2000.
 
Show Less References

Article

Overestimated Effect of Epo Administration on Aerobic Exercise Capacity: A Meta-Analysis

1Department of Psychology, Open University, Heerlen, The Netherlands

2Department of Movement Sciences, University of Maastricht, Maastricht, The Netherlands


American Journal of Sports Science and Medicine. 2013, 1(2), 17-27
DOI: 10.12691/ajssm-1-2-2
Copyright © 2013 Science and Education Publishing

Cite this paper:
Hein F.M. Lodewijkx, Bram Brouwer, Harm Kuipers, René van Hezewijk. Overestimated Effect of Epo Administration on Aerobic Exercise Capacity: A Meta-Analysis. American Journal of Sports Science and Medicine. 2013; 1(2):17-27. doi: 10.12691/ajssm-1-2-2.

Correspondence to: Hein F.M. Lodewijkx, Department of Psychology, Open University, Heerlen, The Netherlands. Email: Hein.Lodewijkx@ou.nl, lodex@ziggo.nl

Abstract

Recent studies examining the relationship between epo doping and aerobic performance (the EDAP–relationship) yield conflicting results. To resolve this inconclusiveness in an empirical way, we conducted a meta–analysis on 17 laboratory studies and assessed effect sizes (unbiased d, r and r2) of the epo–induced improvements in aerobic exercise capacity measured by maximal oxygen uptake (VO2max) and maximal aerobic power output (Wmap). The fixed, pooled EDAP effect size estimates were moderate, d = 0.41–0.49, r = .19–.44, and r2 = .04–.19, revealing a shift of approximately half SD in performances of the epo–treated compared to the non–treated participants. As to VO2max, we observed the strongest post test performance (M = 64.39ml kg-1 min-1) in double blind, placebo controlled studies on performances assessed at sea level with an increase from pre to post tests of M = 4.02ml kg-1 min-1. Regarding Wmap, the increase was M = 26W with the strongest post test performance of M = 398W observed in similar studies as VO2max. Percents improvement from pre to post tests varied between M = 6–7% (VO2max), and M = 7–8% (Wmap). The largest improvement in VO2max we found equals an increase in velocity of about 1km/h. Consistent with recent studies criticizing the EDAP-relationship our findings indicate that its strength is overestimated. In turn, this entails that the relationship between epo doping and cyclists’ performances at real contests is overrated too.

Keywords

References

[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[
[[1]  Brouwer, B., Lodewijkx, H. F. M. and Kuipers, H., “Doping confessions of cyclists revisited.” [In Dutch: “Doping-bekentenissen van wielrenners langs de wetenschappelijke meetlat”]. Sportpsychologie Bulletin, 20: 24-37, 2009.
 
[[2]  Lodewijkx, H.F.M., Give some and take some: Cycling as double play. [In Dutch: Tussen geven en nemen: Wielrennen als dubbelspel]. 2010 Uitgevers, Rotterdam, 2011.
 
[[3]  Lodewijkx, H. F. M. and Brouwer, B. “Some empirical notes on the 'epo epidemic' in professional cycling.” Research Quarterly for Exercise and Sport, 82(4): 593-608, 2011.
 
[[4]  Lodewijkx, H. F. M. and Brouwer B., “Tour, Giro Vuelta: Rapid progress in cycling performance starts in the 1980s.” International Journal of Sports Science, 2(3): 24-31, 2012.
 
[[5]  Lodewijkx, H.F.M. and Verboon, P., “Lance Armstrong’s era of performance – Part 1: Are his time trial performances much different from other winners?” Journal of Athletic Enhancement, 2: 1, 2013.
 
Show More References
[6]  Lundby, C. and Olsen, N. V., “Effects of recombinant human erythropoietin in normal humans.” Journal of Physiology, 589(6):1265-1271, 2011.
 
[7]  Ninot, G., Connes, P., and Caillaud, C., “Effects of recombinant human erythropoietin injections on physical self in endurance athletes.” Journal of Sports Sciences, 24: 383-391, 2006. (meta–analysis).
 
[8]  Catlin, D. H., Hatton, C. K., and Lasne, F., “Abuse of recombinant erythropoietins by athletes.” In G. Molineux, M. A. Foote, and S. G. Elliott (Eds.), Erythropoietins and erythropoiesis. Birkhäuser Verlag, Basel, 2006, 205-228.
 
[9]  Lasne, F., “Erythropoietin doping: Detection in urine.” In J. L.Fourcroy (Ed.), Pharmacology, doping and sport: Routledge, London, 2009, 107-124.
 
[10]  Varlet-Marie, E., Gaudard, A., Audran, M., and Bressolle, F., “Pharmacokinetics / pharmacodynamics of recombinant human erythropoietins in doping control.” Sports Medicine, 33(4): 301-315, 2003.
 
[11]  Bassett, D. R. and Howley, E. T., “Limiting factors for maximum oxygen uptake and determinants of endurance performance.” Medicine and Science in Sports and Exercise, 32: 70-84, 2000.
 
[12]  Coyle, E. F., Coggan, A. R., Hopper, M. K., and Walters, T. J., “Determinants of endurance in well-trained cyclists.” Journal of Applied Physiology, 64: 2622-2630, 1988.
 
[13]  Kuipers, H., “Putative effects of doping in cycling.” [In Dutch: “Vermeende effecten van doping in de wielersport”]. Nederlands Tijdschrift voor Geneeskunde, 150(48): 2643-2645, 2006.
 
[14]  Lucia, A., Hoyos, J., Pérez, M., Santalla, A., and Chicharro, J. L., “Inverse relationship between VO2max and economy/efficiency in world-class cyclists.” Medicine and Science in Sports and Exercise, 34: 2079-2084, 2002.
 
[15]  Lucia, A., Hoyos, J., Pérez, M., Santalla, A., Earnest, C. P., and Chicharro, J. L., “Which laboratory variable is related with time trial performance time in the Tour de France?” British Journal of Sports Medicine, 38: 636-640, 2004.
 
[16]  Heuberger, J. A. A. C., Cohen-Tervaert, J. M., Schepers, F. M. L., Vliegenthart. A. D. B., Rotmans, J. I., Daniels, J. M. A., Burggraaf, J. and Cohen, A. F., “Erythropoietin doping in cycling: Lack of evidence for efficacy and a negative risk–benefit.” British Journal of Clinical Pharmacology, 2012.
 
[17]  Hedges, L. V. and Olkin, I., Statistical methods for meta-analysis. Academic Press, New York, 1985.
 
[18]  Rosenthal, R., Rosnow, R. L., and Rubin, D. B., Contrast and effect sizes in behavioral research: A correlational approach. Cambridge University Press, Cambridge, UK, 2000.
 
[19]  Ashenden, M. J., Hahn, A. G., Martin, D. T., Logan, P., Parisotto, R., and Gore, C. J., “A comparison of the physiological response to simulated altitude exposure and r-HuEpo administration.” Journal of Sports Sciences, 19: 831-837, 2001. (meta–analysis).
 
[20]  Audran, M., Gareau, R., Matecki, S., Duran, F., Chenard, C., Sicart, M.T. et al., “Effects of erythropoietin administration in training athletes and possible indirect detection in doping control.” Medicine and Science in Sports and Exercise, 31: 639-645, 1999. (meta–analysis).
 
[21]  Balsom, P. D., Ekblom, B., and Sjodin, B., “Enhanced oxygen availability during high intensity intermittent exercise decreases anaerobic metabolite concentrations in blood.” Acta Physiologica Scandinavica, 150: 455-456, 1994. (meta–analysis).
 
[22]  Birkeland, K. I., Stray-Gundersen, J., Hemmersbach, P., Hallen, J., Haug, E., and Bahr, R., “Effect of rhEPO administration on serum levels of sTfR and cycling performance.” Medicine and Science in Sports and Exercise, 32: 1238-1243, 2000. (meta–analysis).
 
[23]  Connes, P., Caillaud, C., Mercier, J., Bouix, D., and Casties, J. F., “Injections of recombinant human erythropoietin increases lactate influx into erythrocytes.” Journal of Applied Physiology, 97(1): 326-332, 2004. (meta–analysis).
 
[24]  Connes, P., Perry, S., Varray, A., Préfaut, C., and Caillaud, C., “Faster oxygen uptake kinetics at the onset of submaximal cycling exercise following 4 weeks recombinant human erythropoietin (rHuEPO) treatment.” European Journal of Physiology, 447: 231-238, 2003. (meta–analysis).
 
[25]  Ekblom, B. and Berglund, B., “Effect of erythropoietin administration on maximal aerobic power.” Scandinavian Journal of Medicine and Science in Sports, 1(2): 88-93, 1991. (meta–analysis).
 
[26]  Lundby, C., Achman-Andersen, N. J., Thomsen, J. J., Norgaard, A. M., and Robach, P., “Testing for recombinant human erythropoietin in urine: Problems associated with current anti-doping testing.” Journal of Applied Physiology, 105: 417-419, 2008. (meta–analysis).
 
[27]  Lundby, C. and Damsgaard, R., “Exercise performance in hypoxia after novel erythropoiesis stimulating protein treatment.” Scandinavian Journal of Medicine and Science in Sports, 16: 35-40, 2006. (meta–analysis).
 
[28]  Lundby, C., Robach, P., Boushel, R., Thomsen, J. J., Rasmussen, P., Koskolou, M. et al., “Does recombinant human epo increase exercise capacity by means other than augmenting oxygen transport.” Journal of Applied Physiology, 105: 581-587, 2008. (meta–analysis).
 
[29]  Parisotto, R., Gore, C. J., Emslie, K. R., Ashenden, M. J., Brugnara, C., Howe, C. et al., “A novel method utilizing altered erythropoiesis for the detection of recombinant human erythropoietin abuse in athletes.” Haematologica, 85: 564-572, 2000. (meta–analysis).
 
[30]  Rassmussen, P., Foged, E. M., Krogh-Madsen, R., Nielsen, J., Nielsen, T. R., Olsen, N. V. et al., “Effects of erythropoietin administration on cerebral metabolism and exercise capacity in men.” Journal of Applied Physiology, 109 (2): 476-483, 2010. (meta–analysis).
 
[31]  Robach, P., Calbet, J. A. L., Thomsen, J. J., Boushel, R., Mollard, P., Rasmussen, P. et al., “The ergogenic effect of recombinant human erythropoietin on VO2max depends on the severity of arterial hypoxemia.” PLoS ONE, 3: 1-13, 2008. (meta–analysis).
 
[32]  Russell, G., Gore, C. J., Ashenden, M. J., Parisotto, R., and Hahn, A. G., “Effects of prolonged low doses of recombinant human erythropoietin during submaximal and maximal exercise.” European Journal of Applied Physiology, 86: 442-449, 2002. (meta–analysis).
 
[33]  Thomsen, J. J., Rentsch, R. L., Robach, P., Calbet, J. A. L., Boushel, R., Rasmussen, P. et al., “Prolonged administration of recombinant human erythropoietin increases submaximal performance more than maximal aerobic capacity.” European Journal of Applied Physiology, 101 (4): 481-486, 2007. (meta–analysis).
 
[34]  Wilkerson, D. P., Rittweger, J., Berger, N. J. A., Naish, F., and Jones, A. M., “Influence of recombinant human erythropoietin treatment on pulmonary O2 uptake kinetics during exercise in humans.” Journal of Physiology, 568: 639-652, 2005. (meta–analysis).
 
[35]  Rosenthal, R., “Parametric measures of effect size.” In H. Cooper and L. V. Hedges (Eds.), The handbook of research synthesis. Russell Sage Foundation, New York, 1994, 231-244.
 
[36]  Egger, M., Smith, G. D., Schneider, M., and Minder, C., “Bias in meta-analysis detected by a simple, graphical test.” British Medical Journal, 315: 629-634, 1997.
 
[37]  Cohen, J., Statistical power analysis for the behavioral sciences (2nd ed.). Lawrence Earlbaum Associates, Hillsdale, NJ, 1988.
 
[38]  Nevill, A. M., Jobson, S. A., Palmer, G. S., Olds, T. S., “Scaling maximal oxygen uptake to predict cycling time-trial performance in the field: a non-linear approach”. European Journal of Applied Physiology, 94: 705-710, 2005.
 
[39]  Jeukendrup, A. E., Craig, N. P., and Hawley, J. A., “The bioenergetics of World Class Cycling.” Journal of Science and Medicine in Sports, 3: 414-433, 2, 2000.
 
[40]  Johnson, A. T., Biomechanics and exercise physiology: Quantitative modeling. CRCPress / Taylor and Francis Group, New York, 2007.
 
[41]  Joyner, M. J., and Coyle, E. F., “Endurance exercise performance: The physiology of champions.” Journal of Physiology, 586: 35-44, 2008.
 
[42]  Wilmore, J. H., Costill, D. L., and Kenney, W. L., Physiology of sport and exercise. Human Kinetics, Champaign, Il., 2008.
 
[43]  Atkinson, G., Peacock, O., St Clair Gibson, A., and Tucker, R., “Distribution of power output during cycling: Impact and mechanisms.” Sports Medicine, 37: 647-667, 2007.
 
[44]  Myburg, K. H., “What makes an endurance athlete world-class?: Not simply a physiological conundrum. Comparative Biochemistry and Physiology - part A. Molecular and Integrative Physiology, 136: 171-190, 2003.
 
[45]  Hopkins, W. G., Hawley, J. A., and Burke, L. M., “Design and analysis of research on sport performance enhancement.” Medicine and Science in Sports and Exercise, 31: 472-485, 1999.
 
[46]  Lucia, A., Earnest, C., and Arribas, C., “The Tour de France: a physiological review.” Scandinavian Journal of Medicine and Science in Sports, 13: 275-283, 2003
 
Show Less References

Article

Effect of Training on Selected Biochemical Variables of Elite Male Swimmers

1Department of Physiology, Midnapore College, Midnapore, West Bengal, India

2Department of Health Sciences, Manav Rachana International University, Faridabad, India


American Journal of Sports Science and Medicine. 2013, 1(2), 13-16
DOI: 10.12691/ajssm-1-2-1
Copyright © 2013 Science and Education Publishing

Cite this paper:
Indranil Manna, Gulshan Lal Khanna. Effect of Training on Selected Biochemical Variables of Elite Male Swimmers. American Journal of Sports Science and Medicine. 2013; 1(2):13-16. doi: 10.12691/ajssm-1-2-1.

Correspondence to: Indranil Manna, Department of Physiology, Midnapore College, Midnapore, West Bengal, India. Email: indranil_manna@yahoo.com

Abstract

The aim of the present study was to find out the effect of training on biochemical variables of elite male swimmers. A total of 60 Indian elite male swimmers (age: 17.33 ± 1.47 yrs; height: 173.08 ± 5.80 cm; body mass: 68.11 ± 5.02 kg) who regularly participate in competitive swimming volunteered for this study. A well-designed training program for the swimmers was employed for 12 weeks. The training sessions were divided into 2 phases (a) Preparatory Phase (PP, 8 weeks) and (b) Competitive Phase (CP, 4 weeks). Each phase was further subdivided into macro cycles and micro cycles, and were completed 4 hr/d; 5 d/wk. Selected variables were measured at zero level (baseline data, BD) and at the end of preparatory phase (PP) and competitive phase (CP) of training. A significant increase (P < 0.05) in serum urea, uric acid, high density lipoprotein cholesterol (HDL-C) was observed after training. On the other hand, a significant reduction (P < 0.05) in resting and peak blood lactate, hemoglobin, total cholesterol (TC), triglyceride (TG) and low density lipoprotein cholesterol (LDL-C), TC/HDL and LDL/HDL were noted after the conclusion of training. The training program was effective for improving selected biochemical parameters for swimmers, and may be employed for monitoring training.

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References

[[[[[[[[[[[[[[[[[[[[[
[[1]  Bompa, T.O, Periodization Training. In: Bompa TO (ed). Periodization Training for Sports. Human Kinetics, Champaign, IL, 1999, 147-311.
 
[[2]  Nielsen, M.S. and Weber, R.E. Antagonistic interaction between oxygenation-linked lactate and CO2 binding to human hemoglobin. Comp Bioc Physiol Mol Integr Physiol, 146. 429-434. 2007.
 
[[3]  Suhr, F., Porten, S., Hertrich, T, et al. Intensive exercise induces changes of endothelial nitric oxide synthase pattern in human erythrocytes. Nitric Oxide, 20. 95-103. 2009.
 
[[4]  Urhausen, A. and Kindermann, W. Diagnosis of over training: what tools do we have? Sport Med, 32. 95-102. 2002.
 
[[5]  Heitkamp, H.C., Wegler, S., Brehme, U. and Heinle, H. Effect of an 8-week endurance training program on markers of antioxidant capacity in women. J Sports Med Phys Fit, 48. 113-119. 2008.
 
Show More References
[6]  Kargotich, S., Keast, D., Goodman, C., et al. Monitoring 6 weeks of progressive endurance training with plasma glutamine. Int J Sport Med, 28. 211-216. 2007.
 
[7]  Cox, K.L., Burke, V., Beilin, L.J. and Puddey, I.B. A comparison of the effects of swimming and walking on body weight, fat distribution, lipids, glucose and insulin in older women-the sedentary women Exercise Adherence Trial 2. Metabol, 59. 1562-1573. 2010.
 
[8]  Kelley, G.A. and Kelley, K.S. Impact of progressive resistance training on lipids and lipoproteins in adults: a meta-analysis of randomized controlled trials. Prev Med., 48. 9-19. 2009.
 
[9]  Altena, T.S., Michaelson, J.L., Ball, S.D., et al. Lipoprotein subfraction changes after continuous or intermittent exercise training. Med Sci Sports Exerc., 38. 367-372. 2006.
 
[10]  Halverstadt, A., Phares, D.A., Wilund, K.R., et al. Endurance exercise training raises high-density lipoprotein cholesterol and lowers small low-density lipoprotein and very low-density lipoprotein independent of body fat phenotypes in older men and women. Metabol., 56. 444-450. 2007.
 
[11]  Khanna, G.L. and Manna, I. Study of Physiological Profile of Indian Boxers. J Sports Sci Med, 5. 90-98. 2006.
 
[12]  Mukharjee, K.L. Medical laboratory technology. A procedure manual for routine diagnostic tests. Vol I – III. Tata McGraw-Hill Publishing Company Limited, New Delhi, 1997.
 
[13]  Rao, M. N. Medical Biochemistry. New Age International Publishers. New Delhi, 2006.
 
[14]  Pedchenko, V.V. and Malakhov, V. N. Enzymatic methods for quantitative determination of total cholesterol in blood serum. Vopr Med Khim, 37. 85-91. 1991.
 
[15]  Naik, P. Essentials of Biochemistry. Jaypee Brothers Medical Publishers. New Delhi, 2012.
 
[16]  Mc Ardle, W.D., Katch, F.I. and Katch, V.L. Essentials of Exercise Physiology. 3rd ed. Lippincott Williams and Wilkins, Philadelphia PA, 2006.
 
[17]  Wilmore, J.H. and Costill, D.L. Physiology of Sport and Exercise. 3rd ed. Human Kinetics, Champaign IL, 2005.
 
[18]  Ali, R.S., Koushkie, J.M., Asadmanesh, A. and Salesi, M. Influence of massage, active and passive recovery on swimming performance and blood lactate. J Sports Med Phys Fit, 52. 122-127. 2012.
 
[19]  Rechichi, C. and Dawson, B. Oral contraceptive cycle phase does not affect 200 m swim time trail performance. J Strength Cond Res., 26. 961-967. 2012.
 
[20]  Reilly, T. Physiology of Sports. E & F.N. SPON, London,1990.
 
[21]  Ostojic, S.M. and Ahmetovic, Z. Weekly training volume and hematological status in female top-level athletes of different sports. J Sports Med Phys Fit., 48. 398-403. 2008.
 
[22]  Radjen, S., Radjen, G., Zivotić-Vanović, M, et al. Effect of iron supplementation on maximal oxygen uptake in female athletes. Vojnosanit Pregl., 68. 130-135. 2011.
 
[23]  Fujitsuka, S., Koike, Y., Isozaki, A. and Nomura, Y. Effect of 12 weeks of strenuous physical training on hematological changes. Mill Med, 170. 590-594. 2005.
 
[24]  Neumayr, G., Pfister, R., Hoertnagl, H., et al. Renal function and plasma volume following ultra marathon cycling. Int J Sports Med., 26. 2-8. 2005.
 
[25]  Sideraviciūte, S., Gailiūniene, A., Vasagurskiene, K. and Vizbaraite, D. The effect of long term swimming programme on body composition, aerobic capacity and blood lipids in 14-19 year aged healthy girls and girls with type 1 diabetes mellitus. Medicina (Kaunas), 42. 661-666. 2006.
 
[26]  Degoutte, F., Jouanel, P., Begue, R.J., et al. Food restriction, performance, biochemical, psychological, and endocrine changes in judo athletes. Int J Sports Med., 27. 9-18. 2006.
 
Show Less References
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