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1.
  • Sperlich, Billy, et al. (author)
  • Different types of compression clothing do not increase sub-maximal and maximal endurance performance in well-trained athletes
  • 2010
  • In: Journal of Sports Sciences. - : Routledge, Trevor & Francis group. - 0264-0414 .- 1466-447X. ; 28:6, s. 609-614
  • Journal article (peer-reviewed)abstract
    • The effects of three textiles with increasing compressive surface were compared with non-compressive conventional clothing on physiological and perceptual variables during sub-maximal and maximal running. 15 well-trained endurance athletes (mean ± s, age: 27.1 ± 4.8 years, VO2max 63.7 ± 4.9 ml∙min-1∙kg-1) performed four sub-maximal (~70%VO2max) and maximal tests with and without different compression stockings, tights, and whole body compression suits. Arterial lactate concentration, oxygen saturation and partial pressure, pH, oxygen uptake and ratings of muscle soreness were recorded before, during, and after all tests. Additionally, time to exhaustion was assessed. Sub-maximal (P = 0.22) and maximal oxygen uptake (P = 0.26), arterial lactate concentration (P = 0.16; 0.20), pH (P = 0.23; 0.46), oxygen saturation (P = 0.13; 0.26) and oxygen partial pressure (P = 0.09; 0.20) did not differ between the types of clothing (effect sizes = 0.00-0.45). Ratings of perceived exertion (P = 0.10; 0.15), muscle soreness (P = 0.09; 0.10) and time to exhaustion (P = 0.16) were also unaffected by the different clothing (effect sizes = 0.28-0.85). For the first time, the effect on endurance performance of different types of compression clothing with increasing amount of compressive surface was evaluated. Overall, there were no performance benefits when using the compression garments.
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2.
  • Sperlich, Billy, et al. (author)
  • Effects of 5 Weeks High Intensity Interval Training vs. Volume Training in 14-Year Old Soccer Players
  • 2011
  • In: Journal of Strength and Conditioning Research. - Philadelphia : Lippincott Williams & Wilkins. - 1064-8011 .- 1533-4287. ; 25:5, s. 1271-1278
  • Journal article (peer-reviewed)abstract
    • High intensity interval training (HIIT) in junior and adult soccer has been shown to improve oxygen uptake (VO2) and enhance soccer performance. The main purpose of the present study was to examine the short term effects of a 5-week HIIT vs. high volume training (HVT) program in 14-year-old soccer players regarding the effects on VO2max and 1000m time (T1000) as well as on sprinting and jumping performance. In a 5-week period, 19 male soccer players with a mean (SD) age of 13.5±0.4 years performed HIIT at close to ~90% of maximal heart rate. HVT intensity was set at 60-75% of maximal heart rate. VO2max increased significantly (7.0%) from pre to post in HIIT but not after HVT. T1000 decreased significantly following HIIT (~-10s vs. ~-5s in HVT). Sprint performance increased significantly in both groups from pre to post testing without any changes in jumping performance.
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