Resumos – Journal of Strength & Conditioning Research

Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0b013e318218dd77
Original Investigation: PDF Only
Effect of High-Intensity Interval Training on Cardiovascular Function, [latin capital V with dot above]o2max, and Muscular Force
Astorino, Todd A; Allen, Ryan P; Roberson, Daniel W; Jurancich, Matt

Astorino, TA, Allen, RP, Roberson, DW, and Jurancich, M. Effect of high-intensity interval training on cardiovascular function, [latin capital V with dot above]o2max, and muscular force. J Strength Cond Res 25(X): 000-000, 2011-The purpose of this study was to examine the effects of short-term high-intensity interval training (HIIT) on cardiovascular function, cardiorespiratory fitness, and muscular force. Active, young (age and body fat = 25.3 +/- 4.5 years and 14.3 +/- 6.4%) men and women (N = 20) of a similar age, physical activity, and maximal oxygen uptake ([latin capital V with dot above]o2max) completed 6 sessions of HIIT consisting of repeated Wingate tests over a 2- to 3-week period. Subjects completed 4 Wingate tests on days 1 and 2, 5 on days 3 and 4, and 6 on days 5 and 6. A control group of 9 men and women (age and body fat = 22.8 +/- 2.8 years and 15.2 +/- 6.9%) completed all testing but did not perform HIIT. Changes in resting blood pressure (BP) and heart rate (HR), [latin capital V with dot above]o2max, body composition, oxygen (O2) pulse, peak, mean, and minimum power output, fatigue index, and voluntary force production of the knee flexors and extensors were examined pretraining and posttraining. Results showed significant (p < 0.05) improvements in [latin capital V with dot above]o2max, O2 pulse, and Wingate-derived power output with HIIT. The magnitude of improvement in [latin capital V with dot above]o2max was related to baseline [latin capital V with dot above]o2max (r = -0.44, p = 0.05) and fatigue index (r = 0.50, p < 0.05). No change (p > 0.05) in resting BP, HR, or force production was revealed. Data show that HIIT significantly enhanced [latin capital V with dot above]o2max and O2 pulse and power output in active men and women.



Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0b013e318242d2d1
Original Investigation: PDF Only
Effects of a periodised small-sided game training intervention on physical performance in elite professional soccer
Owen, Adam; Wong, Del P; Paul, Darren; Dellal, Alexandre

The present study examined the effects of periodised small-sided games (SSGs) training intervention during a 4-week in-season break on the physical performance changes (i.e., speed, aerobic performance, and repeated-sprint ability) within elite European soccer players. Fifteen elite male professional players (age: 24.5+/-3.45 years; height: 181.1+/-5.78 cm; body mass: 78.7+/-7.67 kg; VO2max: 54.88+/-5.25 from a Scottish Premier League team participated in 7 separate SSG sessions (3 vs. 3 plus goalkeepers) of which games lasted for 3 min durationfor the selected number of games (ranged from 5 to 11) increasing over the intervention period.To examine the effects of the SSGs intervention on physical performance changes, pre- and post-testing sessions took place over a two-day period (day one: anthropometry, and repeated-sprint ability (RSA) assessments; day two: running economy, and blood lactate assessments). Results show that the 4-week SSGs training intervention induced significant improvement in RSA as indicated by faster 10m sprint time (p< 0.05, small effect), total sprint time (p< 0.05, medium effect), and smaller percentage decrement score (p< 0.05, medium effect). Furthermore, the SSGs also led to an improvement in running economy (RE) as indicated through significantly reduced VO2 and heart-rate at running speed 9, 11 and (all p< 0.05, large effects). In conclusion, the present study demonstrates that implementing a periodised SSGs training intervention during the 4-week in-season break is capable of improving elite level soccer playersphysical fitness characteristics. Being able to develop physical characteristics in conjunction to technical and tactical elements of the game, within a relatively short time period, makes SSGs an appealing proposition for fitness coaches, players and technical coaches alike.



Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0b013e31821d97f4
Orginal article: PDF Only
Influence of Wrestling on the Physiological and Skill Demands of Small-Sided Games
Gabbett, Tim J; Jenkins, David G; Abernethy, Bruce

Gabbett, TJ, Jenkins, DG, and Abernethy, B. Influence of wrestling on the physiological and skill demands of small-sided games. J Strength Cond Res 25(X): 000-000, 2011-This study investigated the influence of wrestling on the physiological and skill demands of small-sided games. Twenty-eight elite rugby league players ([mean +/- SE] age, 21.6 +/- 0.5 years) participated in this within-subject crossover study. On day 1, 14 players played 2, 8-minute small-sided games, whereas the remaining 14 players played identical games with intermittent wrestling throughout. Each game was separated by 90 seconds. On day 2, the groups were crossed over. Movement was recorded by a global positioning system unit (miniMaxX, Catapult Innovations, Melbourne, Australia), sampling at 5 Hz. Each small-sided game was filmed to track the number of possessions and the number and quality of disposals. The games without wrestling resulted in a greater (p < 0.05) total distance covered (2,475 +/- 31 vs. 1,964 +/- 27 m) and greater distance covered in low (930 +/- 19 vs. 842 +/- 19 m), moderate (1,120 +/- 28 vs. 752 +/- 26 m), high (332 +/- 16 vs. 240 +/- 12 m), and very-high (24 +/- 4 vs. 15 +/- 3 m) velocity movement intensities. Conversely, the games with wrestling resulted in a significantly greater (p < 0.05) distance covered in mild, moderate, and maximal accelerations and a greater number of repeated high-intensity effort bouts (2.1 +/- 0.2 bouts vs. 0.2 +/- 0.1 bouts). No significant differences (p > 0.05) were detected between games with and without wrestling for the total number of involvements, receives, passes, effective passes, ineffective passes, and disposal efficiency. The results of this study demonstrate that intermittent wrestling reduces the running demands but increases the repeated high-intensity effort demands of small-side games. Furthermore, these physiological changes occur without compromising the volume of skill executions, the number of errors, or disposal efficiency. From a practical perspective, these results suggest that intermittent wrestling may be a useful supplement to small-sided games to concurrently train repeated-effort ability and skills under game-specific fatigue.



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