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- Sperlich, Billy, et al.
(författare)
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Are Peak Oxygen Uptake and Power Output at Maximal Lactate Steady State Obtained from a 3-Min All-Out Cycle Test?
- 2011
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Ingår i: International Journal of Sports Medicine. - : Georg Thieme Verlag KG. - 0172-4622 .- 1439-3964. ; 32:6, s. 433-437
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the study was to examine whether 1) the power output attained in the last 30 s of a 3-min all-out test (P(end)) correlates with the power output at maximal lactate steady state (P(MLSS)) and whether 2) peak oxygen uptake (VO(2peak)) can be obtained from a 3-min all-out test in well-trained cyclists. 18 cyclists (23 +/- 3 years; 186.1 +/- 6.9 cm; 79.1 +/- 8.2kg; VO(2peak) : 63.2 +/- 5.2 mL . kg(-1) . min(-1)) performed a ramp test, a 3-min all-out test and several submaximal constant 30 min-workload tests at + 15, 0, -15, -30, -45, -60, -75, -90 W of P(end) to obtain P(MLSS). P(MLSS) was significantly lower compared to P(END) (p < 0.001; mean difference: 54 +/- 18 W) with a high correlation (r = 0.93; R(2) = 0.87; p < 0.001) but great intra-individual variability (15-90 W). There were no mean differences between the ramp-VO(2)peak and 3-min all-out cycling VO(2peak) (p = 0.29; mean difference: 133 +/- 514 mL . min(-1)) showing significant correlation (r = 0.60; R(2) = 0.37; p = 0.006) but great intra-individual variability (1057-1312 mL . min(-1)). We therefore suggest that in well-trained cyclists a 3-min all-out test is 1) not sufficient to obtain P(MLSS) and 2) should not be applied to assess VO(2peak).
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| 2. |
- Sperlich, Billy, et al.
(författare)
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Cardio-respiratory and metabolic responses to different levels of compression during submaximal exercise
- 2011
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Ingår i: Phlebology. - London : The Royal Society of Medicine Press. - 0268-3555 .- 1758-1125. ; 26:3, s. 102-106
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Tidskriftsartikel (refereegranskat)abstract
- Objective: The effects of knee-high socks that applied different levels of compression (0, 10, 20, 30 and 40 mmHg) on various cardio-respiratory and metabolic parameters during submaximal running were analysed. Methods: Fifteen well-trained, male endurance athletes (age: 22.2 +/- 1.3 years; peak oxygen uptake: 57.2 +/- 4.0 mL/minute/kg) performed a ramp test to determine peak oxygen uptake. Thereafter, all athletes carried out five periods of submaximal running (at approximately 70% of peak oxygen uptake) with and without compression socks that applied the different levels of pressure. Cardiac output and index, stroke volume, arteriovenous difference in oxygen saturation, oxygen uptake, arterial oxygen saturation, heart rate and blood lactate were monitored before and during all of these tests. Results: Cardiac output (P = 0.29) and index (P = 0.27), stroke volume (P = 0.50), arteriovenous difference in oxygen saturation (P = 0.11), oxygen uptake (P = 1.00), arterial oxygen saturation (P = 1.00), heart rate (P = 1.00) and arterial lactate concentration (P = 1.00) were unaffected by compression (effect sizes = 0.00-0.65). Conclusion: This first evaluation of the potential effects of increasing levels of compression on cardio-respiratory and metabolic parameters during submaximal exercise revealed no effects whatsoever.
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| 3. |
- Sperlich, Billy, et al.
(författare)
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Effects of 5 Weeks High Intensity Interval Training vs. Volume Training in 14-Year Old Soccer Players
- 2011
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Ingår i: Journal of Strength and Conditioning Research. - Philadelphia : Lippincott Williams & Wilkins. - 1064-8011 .- 1533-4287. ; 25:5, s. 1271-1278
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Tidskriftsartikel (refereegranskat)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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| 4. |
- Sperlich, Billy, et al.
(författare)
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Table tennis: Cardio-respiratory and metabolic analysis of match and exercise in elite junior national players
- 2011
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Ingår i: International Journal of Sports Physiology and Performance. - : Human Kinetics. - 1555-0265 .- 1555-0273. ; 6:2, s. 234-242
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The aim of the study was to determine the cardiorespiratory and metabolic characteristics during intense and moderate table tennis (TT) training, as well as during actual match play conditions. Methods: Blood lactate concentration (Lac), heart rate (HR, beats per minute [bpm]), oxygen uptake (VO(2)), and energy expenditure (EE) in 7 male participants of the German junior national team (age: 14 +/- 1 y, weight: 60.5 +/- 5.6 kg height; 165 +/- 8 cm) were examined during six training sessions (TS) and during an international match. The VO(2) was measured continuously with portable gas analyzers. Lac was assessed every 1 to 3 min during short breaks. Results: Mean (peak) values for Lac, HR, VO(2), and EE during the TS were 1.2 +/- 0.7 (4.5) mmol.L(-1), 135 +/- 18 (184) bpm, 23.5 +/- 7.3 (43.0) mL.kg(-1).min-(1), and 6.8 +/- 2.0 (11.2) METs, respectively. During match play, mean (peak) values were 1.1 +/- 0.2 (1.6) mmol.L(-1), 126 +/- 22 (189) bpm, 25.6 +/- 10.1 (45.9) mL.kg(-1).min(-1), and 4.8 +/- 1.4 (9.6) METs, respectively. Conclusions: For the first time, cardiorespiratory and metabolic data in elite junior table tennis have been documented demonstrating low cardiorespiratory and metabolic demands during TT training and match play in internationally competing juniors.
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