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Peter Krustrup - One of the best experts on this subject based on the ideXlab platform.
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Physiological Response and activity profile in recreational small sided football no effect of the number of players
Scandinavian Journal of Medicine & Science in Sports, 2014Co-Authors: Morten B Randers, Peter Krustrup, Jens Bangsbo, Jens Jung NielsenAbstract:We examined the effect of the number of players on the activity profile and Physiological Response to small-sided recreational football games with fixed relative pitch size. Twelve untrained men (age: 33.0 ± 6.4 (± standard deviation) years, fat%: 22.4 ± 6.1%, VO₂ max: 43.3 ± 5.2 mL/min/kg) completed three football sessions of 4 times 12 min with 3v3, 5v5, or 7v7 in a randomized order. Pitch sizes were 80 m(2) per player. Activity profile (10 Hz global positioning system), heart rate (HR), and rating of perceived exertion (RPE) were measured, and blood samples were collected before and during games. Average HR was 84.1 ± 3.9, 84.5 ± 5.0, and 82.8 ± 5.1 %HRmax for 3v3, 5v5, and 7v7, respectively, with no difference between game formats. High blood lactate (5.9 ± 2.9, 5.9 ± 2.4, and 5.5 ± 2.9 mmol/L) and plasma NH₃ concentrations (124 ± 48, 112 ± 38, and 126 ± 55 μmol/L, respectively) were observed during 3v3, 5v5, and 7v7, respectively, with no difference between formats. Similar total distance (3676 ± 478, 3524 ± 467, and 3577 ± 500 m), high-intensity distance (349 ± 145, 406 ± 134, and 409 ± 165 m), and RPE (4.7 ± 1.6, 4.9 ± 2.1, and 4.6 ± 1.8) were also observed. The number of intense accelerations (500 ± 139 vs 459 ± 143 and 396 ± 144) were higher (P < 0.05) during 3v3 than 5v5 and 7v7. In conclusion, the intensity is high during small-sided recreational football games, with similar Physiological Responses for 6-14 players when pitch size is adapted, providing further evidence that effective recreational football training is easy to organize.
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the copenhagen soccer test Physiological Response and fatigue development
Medicine and Science in Sports and Exercise, 2012Co-Authors: Mads Bendiksen, Peter Krustrup, Magni Mohr, Jens Bangsbo, Rasmus Bischoff, Morten B Randers, Ian Rollo, Charlotte SuettaAbstract:INTRODUCTION: The aims of the study were 1) to evaluate whether a multifaceted simulated soccer game protocol, entitled the Copenhagen Soccer Test (CST), elicited a similar Physiological loading as a competitive game (CG) and 2) to determine muscle metabolites, blood variables, and sprint performance in various phases of CST. METHODS: Twelve Danish Second- and Third-Division soccer players participated in the study. On separate days, HR measurements, frequent blood sampling, and physical/technical tests were performed during 60- and 90-min versions of the CST during which repeated musculus vastus lateralis biopsies were collected. A CG was also played, where HR was recorded and pre- and post-game muscle biopsies and blood samples were collected. RESULTS: No differences were observed between CST and CG in average HR (85% ± 1% and 86% ± 1% HRmax, P > 0.05) or recovery plasma creatine kinase (24 h: 312 ± 57 and 324 ± 76 U·L, P > 0.05). Muscle glycogen decreased (P 0.05). The rate of glycogen utilization was 4 ± 1 mmol·kg d.w.·min during the warm-up and the first 15 min of CST and 1 ± 1 mmol·kg d.w.·min (P < 0.05) from 60 to 90 min of CST. After 15 min of CST, muscle lactate was elevated (P < 0.05) approximately fivefold (24 ± 3 mmol·kg d.w.), and creatine phosphate was lowered (P < 0.05) by ∼60% (28 ± 4 mmol·kg d.w.). Sprint velocity (2 × 20 m) decreased (P < 0.05) by 7% during CST (5.2 ± 0.6 to 4.9 ± 0.7 m·s). CONCLUSIONS: The Physiological Response to the CST was reproducible and comparable to that of high-level CG. The CST allowed for rapid muscle sampling and revealed high creatine phosphate degradation throughout the test and a lowered glycogen utilization toward the end of the simulated game.
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the yo yo ir2 test Physiological Response reliability and application to elite soccer
Medicine and Science in Sports and Exercise, 2006Co-Authors: Peter Krustrup, Magni Mohr, Lars Nybo, Jack Majgaard Jensen, Jens Jung Nielsen, Jens BangsboAbstract:Purpose: To examine the Physiological Response, reliability, and validity of the Yo-Yo intermittent recovery level 2 test (Yo-Yo IR2). Methods: Thirteen normally trained male subjects carried out four Yo-Yo IR2 tests, an incremental treadmill test (ITT), and various sprint tests. Muscle biopsies and blood samples were obtained, and heart rate was measured before, during, and after the Yo-Yo IR2 test. Additionally, 119 Scandinavian elite soccer players carried out the Yo-Yo IR2 test on two to four occasions. Results: Yo-Yo IR2 performance was 591 ± 43 (320-920) m or 4.3 (2.6-7.9) min. Test-retest coefficient of variation in distance covered was 9.6% (N = 29). Heart rate (HR) at exhaustion was 191 ± 3 bpm, or 98 ± 1% HRmax. Muscle lactate was 41.7 ± 5.4 and 68.5 ± 7.6 mmol·kg-1 d.w. at 85 and 100% of exhaustion time, respectively, with corresponding muscle CP values of 40.4 ± 5.2 and 29.4 ± 4.7 mmol·kg-1 d.w. Peak blood lactate was 13.6 ± 0.5 mM. Yo-Yo IR2 performance was correlated to ITT performance (r = 0.74, P < 0.05) and V?O2max (r = 0.56, P < 0.05) but not to 30- and 50-m sprint performance. Yo-Yo IR2 performance was better (P < 0.05) for international elite soccer players than for moderate elite players (1059 ± 35 vs 771 ± 26 m) and better (P < 0.05) for central defenders (N = 21), fullbacks (N = 20), and midfielders (N = 48) than for goalkeepers (N = 6) and attackers (N = 24). Fifteen elite soccer players improved (P < 0.05) Yo-Yo IR2 performance by 42 ± 8% during 8 wk of preseasonal training. Conclusion: This study demonstrates that the Yo-Yo IR2 test is reproducible and can be used to evaluate an athlete's ability to perform intense intermittent exercise with a high rate of aerobic and anaerobic energy turnover. Specifically, the Yo-Yo IR2 test was shown to be a sensitive tool to differentiate between intermittent exercise performance of soccer players in different seasonal periods and at different competitive levels and playing positions
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:ABSTRACTKRUSTRUP, P., M. MOHR, T. AMSTRUP, T. RYSGAARD, J. JOHANSEN, A. STEENSBERG, P. K. PEDERSEN, and J. BANGSBO. The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity. Med. Sci. Sports Exerc., Vol. 35, No. 4, pp. 697–705, 2003.PurposeTo examine the Physiological
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:PURPOSE: To examine the Physiological Response and reproducibility of the Yo-Yo intermittent recovery test and its application to elite soccer. METHODS: Heart rate was measured, and metabolites were determined in blood and muscle biopsies obtained before, during, and after the Yo-Yo test in 17 males. Physiological measurements were also performed during a Yo-Yo retest and an exhaustive incremental treadmill test (ITT). Additionally, 37 male elite soccer players performed two to four seasonal tests, and the results were related to physical performance in matches. RESULTS: The test-retest CV for the Yo-Yo test was 4.9%. Peak heart rate was similar in ITT and Yo-Yo test (189 +/- 2 vs 187 +/- 2 bpm), whereas peak blood lactate was higher (P < 0.05) in the Yo-Yo test. During the Yo-Yo test, muscle lactate increased eightfold (P < 0.05) and muscle creatine phosphate (CP) and glycogen decreased (P < 0.05) by 51% and 23%, respectively. No significant differences were observed in muscle CP, lactate, pH, or glycogen between 90 and 100% of exhaustion time. During the precompetition period, elite soccer players improved (P < 0.05) Yo-Yo test performance and maximum oxygen uptake ([OV0312]O(2max)) by 25 +/- 6 and 7 +/- 1%, respectively. High-intensity running covered by the players during games was correlated to Yo-Yo test performance (r = 0.71, P < 0.05) but not to [OV0312]O(2max) and ITT performance. CONCLUSION: The test had a high reproducibility and sensitivity, allowing for detailed analysis of the physical capacity of athletes in intermittent sports. Specifically, the Yo-Yo intermittent recovery test was a valid measure of fitness performance in soccer. During the test, the aerobic loading approached maximal values, and the anaerobic energy system was highly taxed. Additionally, the study suggests that fatigue during intense intermittent short-term exercise was unrelated to muscle CP, lactate, pH, and glycogen.
Jens Bangsbo - One of the best experts on this subject based on the ideXlab platform.
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Physiological Response and activity profile in recreational small sided football no effect of the number of players
Scandinavian Journal of Medicine & Science in Sports, 2014Co-Authors: Morten B Randers, Peter Krustrup, Jens Bangsbo, Jens Jung NielsenAbstract:We examined the effect of the number of players on the activity profile and Physiological Response to small-sided recreational football games with fixed relative pitch size. Twelve untrained men (age: 33.0 ± 6.4 (± standard deviation) years, fat%: 22.4 ± 6.1%, VO₂ max: 43.3 ± 5.2 mL/min/kg) completed three football sessions of 4 times 12 min with 3v3, 5v5, or 7v7 in a randomized order. Pitch sizes were 80 m(2) per player. Activity profile (10 Hz global positioning system), heart rate (HR), and rating of perceived exertion (RPE) were measured, and blood samples were collected before and during games. Average HR was 84.1 ± 3.9, 84.5 ± 5.0, and 82.8 ± 5.1 %HRmax for 3v3, 5v5, and 7v7, respectively, with no difference between game formats. High blood lactate (5.9 ± 2.9, 5.9 ± 2.4, and 5.5 ± 2.9 mmol/L) and plasma NH₃ concentrations (124 ± 48, 112 ± 38, and 126 ± 55 μmol/L, respectively) were observed during 3v3, 5v5, and 7v7, respectively, with no difference between formats. Similar total distance (3676 ± 478, 3524 ± 467, and 3577 ± 500 m), high-intensity distance (349 ± 145, 406 ± 134, and 409 ± 165 m), and RPE (4.7 ± 1.6, 4.9 ± 2.1, and 4.6 ± 1.8) were also observed. The number of intense accelerations (500 ± 139 vs 459 ± 143 and 396 ± 144) were higher (P < 0.05) during 3v3 than 5v5 and 7v7. In conclusion, the intensity is high during small-sided recreational football games, with similar Physiological Responses for 6-14 players when pitch size is adapted, providing further evidence that effective recreational football training is easy to organize.
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the copenhagen soccer test Physiological Response and fatigue development
Medicine and Science in Sports and Exercise, 2012Co-Authors: Mads Bendiksen, Peter Krustrup, Magni Mohr, Jens Bangsbo, Rasmus Bischoff, Morten B Randers, Ian Rollo, Charlotte SuettaAbstract:INTRODUCTION: The aims of the study were 1) to evaluate whether a multifaceted simulated soccer game protocol, entitled the Copenhagen Soccer Test (CST), elicited a similar Physiological loading as a competitive game (CG) and 2) to determine muscle metabolites, blood variables, and sprint performance in various phases of CST. METHODS: Twelve Danish Second- and Third-Division soccer players participated in the study. On separate days, HR measurements, frequent blood sampling, and physical/technical tests were performed during 60- and 90-min versions of the CST during which repeated musculus vastus lateralis biopsies were collected. A CG was also played, where HR was recorded and pre- and post-game muscle biopsies and blood samples were collected. RESULTS: No differences were observed between CST and CG in average HR (85% ± 1% and 86% ± 1% HRmax, P > 0.05) or recovery plasma creatine kinase (24 h: 312 ± 57 and 324 ± 76 U·L, P > 0.05). Muscle glycogen decreased (P 0.05). The rate of glycogen utilization was 4 ± 1 mmol·kg d.w.·min during the warm-up and the first 15 min of CST and 1 ± 1 mmol·kg d.w.·min (P < 0.05) from 60 to 90 min of CST. After 15 min of CST, muscle lactate was elevated (P < 0.05) approximately fivefold (24 ± 3 mmol·kg d.w.), and creatine phosphate was lowered (P < 0.05) by ∼60% (28 ± 4 mmol·kg d.w.). Sprint velocity (2 × 20 m) decreased (P < 0.05) by 7% during CST (5.2 ± 0.6 to 4.9 ± 0.7 m·s). CONCLUSIONS: The Physiological Response to the CST was reproducible and comparable to that of high-level CG. The CST allowed for rapid muscle sampling and revealed high creatine phosphate degradation throughout the test and a lowered glycogen utilization toward the end of the simulated game.
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the yo yo ir2 test Physiological Response reliability and application to elite soccer
Medicine and Science in Sports and Exercise, 2006Co-Authors: Peter Krustrup, Magni Mohr, Lars Nybo, Jack Majgaard Jensen, Jens Jung Nielsen, Jens BangsboAbstract:Purpose: To examine the Physiological Response, reliability, and validity of the Yo-Yo intermittent recovery level 2 test (Yo-Yo IR2). Methods: Thirteen normally trained male subjects carried out four Yo-Yo IR2 tests, an incremental treadmill test (ITT), and various sprint tests. Muscle biopsies and blood samples were obtained, and heart rate was measured before, during, and after the Yo-Yo IR2 test. Additionally, 119 Scandinavian elite soccer players carried out the Yo-Yo IR2 test on two to four occasions. Results: Yo-Yo IR2 performance was 591 ± 43 (320-920) m or 4.3 (2.6-7.9) min. Test-retest coefficient of variation in distance covered was 9.6% (N = 29). Heart rate (HR) at exhaustion was 191 ± 3 bpm, or 98 ± 1% HRmax. Muscle lactate was 41.7 ± 5.4 and 68.5 ± 7.6 mmol·kg-1 d.w. at 85 and 100% of exhaustion time, respectively, with corresponding muscle CP values of 40.4 ± 5.2 and 29.4 ± 4.7 mmol·kg-1 d.w. Peak blood lactate was 13.6 ± 0.5 mM. Yo-Yo IR2 performance was correlated to ITT performance (r = 0.74, P < 0.05) and V?O2max (r = 0.56, P < 0.05) but not to 30- and 50-m sprint performance. Yo-Yo IR2 performance was better (P < 0.05) for international elite soccer players than for moderate elite players (1059 ± 35 vs 771 ± 26 m) and better (P < 0.05) for central defenders (N = 21), fullbacks (N = 20), and midfielders (N = 48) than for goalkeepers (N = 6) and attackers (N = 24). Fifteen elite soccer players improved (P < 0.05) Yo-Yo IR2 performance by 42 ± 8% during 8 wk of preseasonal training. Conclusion: This study demonstrates that the Yo-Yo IR2 test is reproducible and can be used to evaluate an athlete's ability to perform intense intermittent exercise with a high rate of aerobic and anaerobic energy turnover. Specifically, the Yo-Yo IR2 test was shown to be a sensitive tool to differentiate between intermittent exercise performance of soccer players in different seasonal periods and at different competitive levels and playing positions
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:ABSTRACTKRUSTRUP, P., M. MOHR, T. AMSTRUP, T. RYSGAARD, J. JOHANSEN, A. STEENSBERG, P. K. PEDERSEN, and J. BANGSBO. The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity. Med. Sci. Sports Exerc., Vol. 35, No. 4, pp. 697–705, 2003.PurposeTo examine the Physiological
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:PURPOSE: To examine the Physiological Response and reproducibility of the Yo-Yo intermittent recovery test and its application to elite soccer. METHODS: Heart rate was measured, and metabolites were determined in blood and muscle biopsies obtained before, during, and after the Yo-Yo test in 17 males. Physiological measurements were also performed during a Yo-Yo retest and an exhaustive incremental treadmill test (ITT). Additionally, 37 male elite soccer players performed two to four seasonal tests, and the results were related to physical performance in matches. RESULTS: The test-retest CV for the Yo-Yo test was 4.9%. Peak heart rate was similar in ITT and Yo-Yo test (189 +/- 2 vs 187 +/- 2 bpm), whereas peak blood lactate was higher (P < 0.05) in the Yo-Yo test. During the Yo-Yo test, muscle lactate increased eightfold (P < 0.05) and muscle creatine phosphate (CP) and glycogen decreased (P < 0.05) by 51% and 23%, respectively. No significant differences were observed in muscle CP, lactate, pH, or glycogen between 90 and 100% of exhaustion time. During the precompetition period, elite soccer players improved (P < 0.05) Yo-Yo test performance and maximum oxygen uptake ([OV0312]O(2max)) by 25 +/- 6 and 7 +/- 1%, respectively. High-intensity running covered by the players during games was correlated to Yo-Yo test performance (r = 0.71, P < 0.05) but not to [OV0312]O(2max) and ITT performance. CONCLUSION: The test had a high reproducibility and sensitivity, allowing for detailed analysis of the physical capacity of athletes in intermittent sports. Specifically, the Yo-Yo intermittent recovery test was a valid measure of fitness performance in soccer. During the test, the aerobic loading approached maximal values, and the anaerobic energy system was highly taxed. Additionally, the study suggests that fatigue during intense intermittent short-term exercise was unrelated to muscle CP, lactate, pH, and glycogen.
Magni Mohr - One of the best experts on this subject based on the ideXlab platform.
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the copenhagen soccer test Physiological Response and fatigue development
Medicine and Science in Sports and Exercise, 2012Co-Authors: Mads Bendiksen, Peter Krustrup, Magni Mohr, Jens Bangsbo, Rasmus Bischoff, Morten B Randers, Ian Rollo, Charlotte SuettaAbstract:INTRODUCTION: The aims of the study were 1) to evaluate whether a multifaceted simulated soccer game protocol, entitled the Copenhagen Soccer Test (CST), elicited a similar Physiological loading as a competitive game (CG) and 2) to determine muscle metabolites, blood variables, and sprint performance in various phases of CST. METHODS: Twelve Danish Second- and Third-Division soccer players participated in the study. On separate days, HR measurements, frequent blood sampling, and physical/technical tests were performed during 60- and 90-min versions of the CST during which repeated musculus vastus lateralis biopsies were collected. A CG was also played, where HR was recorded and pre- and post-game muscle biopsies and blood samples were collected. RESULTS: No differences were observed between CST and CG in average HR (85% ± 1% and 86% ± 1% HRmax, P > 0.05) or recovery plasma creatine kinase (24 h: 312 ± 57 and 324 ± 76 U·L, P > 0.05). Muscle glycogen decreased (P 0.05). The rate of glycogen utilization was 4 ± 1 mmol·kg d.w.·min during the warm-up and the first 15 min of CST and 1 ± 1 mmol·kg d.w.·min (P < 0.05) from 60 to 90 min of CST. After 15 min of CST, muscle lactate was elevated (P < 0.05) approximately fivefold (24 ± 3 mmol·kg d.w.), and creatine phosphate was lowered (P < 0.05) by ∼60% (28 ± 4 mmol·kg d.w.). Sprint velocity (2 × 20 m) decreased (P < 0.05) by 7% during CST (5.2 ± 0.6 to 4.9 ± 0.7 m·s). CONCLUSIONS: The Physiological Response to the CST was reproducible and comparable to that of high-level CG. The CST allowed for rapid muscle sampling and revealed high creatine phosphate degradation throughout the test and a lowered glycogen utilization toward the end of the simulated game.
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the yo yo ir2 test Physiological Response reliability and application to elite soccer
Medicine and Science in Sports and Exercise, 2006Co-Authors: Peter Krustrup, Magni Mohr, Lars Nybo, Jack Majgaard Jensen, Jens Jung Nielsen, Jens BangsboAbstract:Purpose: To examine the Physiological Response, reliability, and validity of the Yo-Yo intermittent recovery level 2 test (Yo-Yo IR2). Methods: Thirteen normally trained male subjects carried out four Yo-Yo IR2 tests, an incremental treadmill test (ITT), and various sprint tests. Muscle biopsies and blood samples were obtained, and heart rate was measured before, during, and after the Yo-Yo IR2 test. Additionally, 119 Scandinavian elite soccer players carried out the Yo-Yo IR2 test on two to four occasions. Results: Yo-Yo IR2 performance was 591 ± 43 (320-920) m or 4.3 (2.6-7.9) min. Test-retest coefficient of variation in distance covered was 9.6% (N = 29). Heart rate (HR) at exhaustion was 191 ± 3 bpm, or 98 ± 1% HRmax. Muscle lactate was 41.7 ± 5.4 and 68.5 ± 7.6 mmol·kg-1 d.w. at 85 and 100% of exhaustion time, respectively, with corresponding muscle CP values of 40.4 ± 5.2 and 29.4 ± 4.7 mmol·kg-1 d.w. Peak blood lactate was 13.6 ± 0.5 mM. Yo-Yo IR2 performance was correlated to ITT performance (r = 0.74, P < 0.05) and V?O2max (r = 0.56, P < 0.05) but not to 30- and 50-m sprint performance. Yo-Yo IR2 performance was better (P < 0.05) for international elite soccer players than for moderate elite players (1059 ± 35 vs 771 ± 26 m) and better (P < 0.05) for central defenders (N = 21), fullbacks (N = 20), and midfielders (N = 48) than for goalkeepers (N = 6) and attackers (N = 24). Fifteen elite soccer players improved (P < 0.05) Yo-Yo IR2 performance by 42 ± 8% during 8 wk of preseasonal training. Conclusion: This study demonstrates that the Yo-Yo IR2 test is reproducible and can be used to evaluate an athlete's ability to perform intense intermittent exercise with a high rate of aerobic and anaerobic energy turnover. Specifically, the Yo-Yo IR2 test was shown to be a sensitive tool to differentiate between intermittent exercise performance of soccer players in different seasonal periods and at different competitive levels and playing positions
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:ABSTRACTKRUSTRUP, P., M. MOHR, T. AMSTRUP, T. RYSGAARD, J. JOHANSEN, A. STEENSBERG, P. K. PEDERSEN, and J. BANGSBO. The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity. Med. Sci. Sports Exerc., Vol. 35, No. 4, pp. 697–705, 2003.PurposeTo examine the Physiological
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:PURPOSE: To examine the Physiological Response and reproducibility of the Yo-Yo intermittent recovery test and its application to elite soccer. METHODS: Heart rate was measured, and metabolites were determined in blood and muscle biopsies obtained before, during, and after the Yo-Yo test in 17 males. Physiological measurements were also performed during a Yo-Yo retest and an exhaustive incremental treadmill test (ITT). Additionally, 37 male elite soccer players performed two to four seasonal tests, and the results were related to physical performance in matches. RESULTS: The test-retest CV for the Yo-Yo test was 4.9%. Peak heart rate was similar in ITT and Yo-Yo test (189 +/- 2 vs 187 +/- 2 bpm), whereas peak blood lactate was higher (P < 0.05) in the Yo-Yo test. During the Yo-Yo test, muscle lactate increased eightfold (P < 0.05) and muscle creatine phosphate (CP) and glycogen decreased (P < 0.05) by 51% and 23%, respectively. No significant differences were observed in muscle CP, lactate, pH, or glycogen between 90 and 100% of exhaustion time. During the precompetition period, elite soccer players improved (P < 0.05) Yo-Yo test performance and maximum oxygen uptake ([OV0312]O(2max)) by 25 +/- 6 and 7 +/- 1%, respectively. High-intensity running covered by the players during games was correlated to Yo-Yo test performance (r = 0.71, P < 0.05) but not to [OV0312]O(2max) and ITT performance. CONCLUSION: The test had a high reproducibility and sensitivity, allowing for detailed analysis of the physical capacity of athletes in intermittent sports. Specifically, the Yo-Yo intermittent recovery test was a valid measure of fitness performance in soccer. During the test, the aerobic loading approached maximal values, and the anaerobic energy system was highly taxed. Additionally, the study suggests that fatigue during intense intermittent short-term exercise was unrelated to muscle CP, lactate, pH, and glycogen.
Tommas Amstrup - One of the best experts on this subject based on the ideXlab platform.
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:ABSTRACTKRUSTRUP, P., M. MOHR, T. AMSTRUP, T. RYSGAARD, J. JOHANSEN, A. STEENSBERG, P. K. PEDERSEN, and J. BANGSBO. The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity. Med. Sci. Sports Exerc., Vol. 35, No. 4, pp. 697–705, 2003.PurposeTo examine the Physiological
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:PURPOSE: To examine the Physiological Response and reproducibility of the Yo-Yo intermittent recovery test and its application to elite soccer. METHODS: Heart rate was measured, and metabolites were determined in blood and muscle biopsies obtained before, during, and after the Yo-Yo test in 17 males. Physiological measurements were also performed during a Yo-Yo retest and an exhaustive incremental treadmill test (ITT). Additionally, 37 male elite soccer players performed two to four seasonal tests, and the results were related to physical performance in matches. RESULTS: The test-retest CV for the Yo-Yo test was 4.9%. Peak heart rate was similar in ITT and Yo-Yo test (189 +/- 2 vs 187 +/- 2 bpm), whereas peak blood lactate was higher (P < 0.05) in the Yo-Yo test. During the Yo-Yo test, muscle lactate increased eightfold (P < 0.05) and muscle creatine phosphate (CP) and glycogen decreased (P < 0.05) by 51% and 23%, respectively. No significant differences were observed in muscle CP, lactate, pH, or glycogen between 90 and 100% of exhaustion time. During the precompetition period, elite soccer players improved (P < 0.05) Yo-Yo test performance and maximum oxygen uptake ([OV0312]O(2max)) by 25 +/- 6 and 7 +/- 1%, respectively. High-intensity running covered by the players during games was correlated to Yo-Yo test performance (r = 0.71, P < 0.05) but not to [OV0312]O(2max) and ITT performance. CONCLUSION: The test had a high reproducibility and sensitivity, allowing for detailed analysis of the physical capacity of athletes in intermittent sports. Specifically, the Yo-Yo intermittent recovery test was a valid measure of fitness performance in soccer. During the test, the aerobic loading approached maximal values, and the anaerobic energy system was highly taxed. Additionally, the study suggests that fatigue during intense intermittent short-term exercise was unrelated to muscle CP, lactate, pH, and glycogen.
Torben Rysgaard - One of the best experts on this subject based on the ideXlab platform.
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:ABSTRACTKRUSTRUP, P., M. MOHR, T. AMSTRUP, T. RYSGAARD, J. JOHANSEN, A. STEENSBERG, P. K. PEDERSEN, and J. BANGSBO. The Yo-Yo Intermittent Recovery Test: Physiological Response, Reliability, and Validity. Med. Sci. Sports Exerc., Vol. 35, No. 4, pp. 697–705, 2003.PurposeTo examine the Physiological
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the yo yo intermittent recovery test Physiological Response reliability and validity
Medicine and Science in Sports and Exercise, 2003Co-Authors: Peter Krustrup, Magni Mohr, Tommas Amstrup, Torben Rysgaard, Johnny Johansen, Aadam Steensberg, Preben K Pedersen, Jens BangsboAbstract:PURPOSE: To examine the Physiological Response and reproducibility of the Yo-Yo intermittent recovery test and its application to elite soccer. METHODS: Heart rate was measured, and metabolites were determined in blood and muscle biopsies obtained before, during, and after the Yo-Yo test in 17 males. Physiological measurements were also performed during a Yo-Yo retest and an exhaustive incremental treadmill test (ITT). Additionally, 37 male elite soccer players performed two to four seasonal tests, and the results were related to physical performance in matches. RESULTS: The test-retest CV for the Yo-Yo test was 4.9%. Peak heart rate was similar in ITT and Yo-Yo test (189 +/- 2 vs 187 +/- 2 bpm), whereas peak blood lactate was higher (P < 0.05) in the Yo-Yo test. During the Yo-Yo test, muscle lactate increased eightfold (P < 0.05) and muscle creatine phosphate (CP) and glycogen decreased (P < 0.05) by 51% and 23%, respectively. No significant differences were observed in muscle CP, lactate, pH, or glycogen between 90 and 100% of exhaustion time. During the precompetition period, elite soccer players improved (P < 0.05) Yo-Yo test performance and maximum oxygen uptake ([OV0312]O(2max)) by 25 +/- 6 and 7 +/- 1%, respectively. High-intensity running covered by the players during games was correlated to Yo-Yo test performance (r = 0.71, P < 0.05) but not to [OV0312]O(2max) and ITT performance. CONCLUSION: The test had a high reproducibility and sensitivity, allowing for detailed analysis of the physical capacity of athletes in intermittent sports. Specifically, the Yo-Yo intermittent recovery test was a valid measure of fitness performance in soccer. During the test, the aerobic loading approached maximal values, and the anaerobic energy system was highly taxed. Additionally, the study suggests that fatigue during intense intermittent short-term exercise was unrelated to muscle CP, lactate, pH, and glycogen.
