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Descripción
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| Introduction Differences in lactate concentration between genders have been quantified during resistance exercise 1, but never during Circuit Weight Trainings (CWT), neither comparing different protocols at the same intensity. Therefore, the aim of this study was to compare venous blood lactate concentrations in men and women during three different CWT. Methods 15 men (22.53± 2.59 years; 76.66±6.45 kg; 177.21±3.77 cm) and 14 women (20.14±2.88 years; 60.38±5.43 kg; 164.36±5.06 cm), all healthy, non-smoking and active, performed three different CWT: Machine Circuit (CM), Free Weight Circuit (FW) and Combined Aerobic- Free Weight Circuit (CE). The CWT consisted on three laps of eight 8 exercises, trying to involve the same muscular groups. The intensity was set at 70% of 15 RM and 70% of the HRR during the aerobic phases. Venous blood samples were analyzed immediately after each lap and every two minutes in the recoveries between laps, using the YSI 1500 SPORT lactate analyser. Three way ANOVA with repeated measures was used to determine differences between protocols and genders. The significant level was set at ?0.05. Results We found interaction among gender, protocol and measurement (F (8.554)=4.524, p<0.001). The analysis showed significant higher lactate values for men in all the measurements (p<0.001), and significant lower concentrations in CE compared to the others protocols (p<0.001). Furthermore, we found some significant differences between MC and FWC, especially at the end of the session. Discussion Our data are in agreement with previous studies, reporting higher values in men than in women 1-2. This could be due to the higher fibre I muscle percentage in women 3, the hormonal state 4-5 or the greater relative external load lifted by men 2. We have also found less lactate concentration during CE, perhaps due the aerobic phase that helped lactate oxidation 6-7. Therefore, we can conclude that during CWT men have higher lactate concentrations than women, and that anaerobic contribution depends not only on the intensity of the session but also on the protocol used, and this influence is presented in both genders. References 1. Bellezza, PA, et al. J Strength Cond Res (2009); 23: 203-8. 2. Scott, C, et al. JEPonline (2008); 11: 56-63. 3. Staron, RS, et al. J Histochem Cytochem (2000); 48: 623-9. 4. D?Eon, TM, et al. Am J Physiol Endocrinol Metab (2002); 283: E1046-55. 5. Ellis, GS, et al. J Appl Physiol (1994); 77: 209-15. 6. Gladden, LB. Med Sci Sports Exerc (2008); 40: 477-85. 7. Miller, BF, et al. J Physiol (2002); 544: 963-75. | |
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Internacional
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Si |
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Nombre congreso
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16th Annual Congress of the European College os Sport Science |
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Tipo de participación
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960 |
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Lugar del congreso
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Liverpool |
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Revisores
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Si |
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ISBN o ISSN
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978-09568903-0-6 |
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DOI
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Fecha inicio congreso
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06/07/2011 |
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Fecha fin congreso
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09/07/2011 |
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Desde la página
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212 |
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Hasta la página
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213 |
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Título de las actas
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Book of abstracts |