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One minute rolling sampling periods: The most sensitive method for identifying transient fatigue in soccer
2010 Asics Conference of Science and Medicine in Sport / Journal of Science and Medicine in Sport 13S (2010) e1–e107
e53
doi:10.1016/j.jsams.2010.10.574
and 5-min; −65.7% −2.51 ± 0.30 and −65.3% −2.46 ± 0.31 respectively) Conclusion: When compared to the literature reporting pre-defined 5-min periods, rolling 5-min periods had a ∼15% greater reduction in HiVR in the epoch following the peak. Using HiVR instead of total distance identified greater decrements in performance, and the largest decrements were visible using shorter sampling periods. In this study only 1-min rolling periods showed greater fatigue in the subsequent 1-min period in the second compared to the first half, and therefore may be the most sensitive measure of transient fatigue in soccer games. Future research could apply this model to the investigation of fatigue in elite adult players to aid in our understanding of the transient fatigue experienced by these players during matches.
114
doi:10.1016/j.jsams.2010.10.575
One minute rolling sampling periods: The most sensitive method for identifying transient fatigue in soccer
115
M. Varley 1,∗ , R. Aughey 1,2
Healthy men in active neighborhoods: Characteristics of physically active and inactive men in low socio-economic communities
Following fatigue protocol one core temperature in the team-sport warm-up was 0.7% > post activation potentiation (effect size: 0.46 ± 0.81), while blood lactate was highest in the post activation potentiation warm-up post fatigue protocol one (6.2 ± 2.4), compared to team-sport (5.3 ± 2.4) and small-sided games (4.6 ± 1.2 mmol L−1 ) and fatigue protocol two (post activation potentiation = 4.5 ± 1.2, teamsport = 4.1 ± 1.7, small-sided games = 3.0 ± 0.8 mmol L−1 ). Conclusion: A post activation potentiation warm-up can reduce performance decrements during a soccer-specific fatigue protocol as compared to small-sided games and current team-sport warm-ups.
1 School
of Sport and Exercise Science, Institute of Sport, Exercise and Active Living, Victoria University, Australia 2 Western Bulldogs Football Club, Australia Introduction: Analysis of the movement demands of athletes during team sports provides information on match fatigue and the physical capabilities of the athlete. Highvelocity running (HiVR) is a valid physical performance measure as it is critical to match success and may distinguish between levels of play. More detailed examination has reported a decrease in the HiVR distance in the period immediately after the most intense epoch. However, that examination was based on pre-defined 5-min periods and therefore the actual peak 5-min of play in a match may have been missed, and using rolling periods may overcome this. Further, significant fatigue could be expected after intense 1 or 2 min periods, but this has not yet been investigated. Method: Using rolling 1-, 2-, and 5-min periods of matches, the greatest total (TD) and HiVR (>4.17 m s−1 ) distance and the subsequent 1-, 2- or 5-min epoch were identified in fourteen elite youth level male soccer players monitored using global positioning system technology (MinimaxX, Team Sports 2.0, Catapult Innovations, Melbourne, Australia) over five Men’s Under 21 matches. Differences were determined and expressed as % change and effect size (ES) statistic with 90% confidence intervals (CI). Results: Total distance was reduced substantially in the subsequent epoch following each 1-, 2- and 5-min period containing the highest TD in both the 1st and 2nd half of the match (1-min; −47.2%, −5.63 ± 0.56; and 52.5%, −4.73 ± 1.58; 2-min; 40.2%, −4.98 ± 0.52; and 36.5%, −4.22 ± 0.54; and 5-min; −24.6% −2.89 ± 0.38; and 24.5%, −2.51 ± 0.31 respectively). Highvelocity running followed the same pattern for both halves (1-min; −89%, −4.12 ± 0.33; and −92.8%, −3.71 ± 0.32; 2-min; −80.4% −3.38 ± 0.26; and −73.4%, −3.29 ± 0.33;
M. Casey 1,∗ , R. Eime 1 , K. Ball 2 , W. Payne 1 1 University 2 Deakin
of Ballarat, Australia University, Australia
Introduction: Physical activity (PA) research amongst men experiencing socioeconomic disadvantage is relatively scarce, despite the high risk of inactivity experienced by this group. This qualitative study compares experiences of men from low SES communities who have successfully and unsuccessfully engaged in PA. Methodology: Men aged 25–65 years from metropolitan inner-city suburbs and a non-metropolitan city were invited to participate through neighbourhood renewal and community health staff, and community advertisements. Data collection methods/instruments comprised a demographics form, semistructured interview, and administration of the International Physical Activity Questionnaire (IPAQ). Neighbourhood renewal and community health staff were also invited to participate in interviews. The socio-ecological model of health guided the interviews to explore individual, interpersonal, organisational, community, environmental and policy influences on PA. Content analysis was applied to identify key themes in the transcripts. Men were defined as active or inactive according to their total PA score based on the IPAQ, using a cutpoint of 600 MET minutes/week. Results: 25 men, aged 44.8 (range: 28–65) years participated; 12 were from metropolitan suburbs and 13 from a non-metropolitan city. They lived alone (n = 12), were not working (n = 7) or permanently unable to work (n = 11), and had no formal qualifications (n = 9) or Year 10 equivalency (n = 7). The context of participation in PA for both groups of men was mostly walking for leisure (n = 11 and n = 5, respectively) and/or transport (n = 10 and n = 4, respectively). Five active men had access to
e53
doi:10.1016/j.jsams.2010.10.574
and 5-min; −65.7% −2.51 ± 0.30 and −65.3% −2.46 ± 0.31 respectively) Conclusion: When compared to the literature reporting pre-defined 5-min periods, rolling 5-min periods had a ∼15% greater reduction in HiVR in the epoch following the peak. Using HiVR instead of total distance identified greater decrements in performance, and the largest decrements were visible using shorter sampling periods. In this study only 1-min rolling periods showed greater fatigue in the subsequent 1-min period in the second compared to the first half, and therefore may be the most sensitive measure of transient fatigue in soccer games. Future research could apply this model to the investigation of fatigue in elite adult players to aid in our understanding of the transient fatigue experienced by these players during matches.
114
doi:10.1016/j.jsams.2010.10.575
One minute rolling sampling periods: The most sensitive method for identifying transient fatigue in soccer
115
M. Varley 1,∗ , R. Aughey 1,2
Healthy men in active neighborhoods: Characteristics of physically active and inactive men in low socio-economic communities
Following fatigue protocol one core temperature in the team-sport warm-up was 0.7% > post activation potentiation (effect size: 0.46 ± 0.81), while blood lactate was highest in the post activation potentiation warm-up post fatigue protocol one (6.2 ± 2.4), compared to team-sport (5.3 ± 2.4) and small-sided games (4.6 ± 1.2 mmol L−1 ) and fatigue protocol two (post activation potentiation = 4.5 ± 1.2, teamsport = 4.1 ± 1.7, small-sided games = 3.0 ± 0.8 mmol L−1 ). Conclusion: A post activation potentiation warm-up can reduce performance decrements during a soccer-specific fatigue protocol as compared to small-sided games and current team-sport warm-ups.
1 School
of Sport and Exercise Science, Institute of Sport, Exercise and Active Living, Victoria University, Australia 2 Western Bulldogs Football Club, Australia Introduction: Analysis of the movement demands of athletes during team sports provides information on match fatigue and the physical capabilities of the athlete. Highvelocity running (HiVR) is a valid physical performance measure as it is critical to match success and may distinguish between levels of play. More detailed examination has reported a decrease in the HiVR distance in the period immediately after the most intense epoch. However, that examination was based on pre-defined 5-min periods and therefore the actual peak 5-min of play in a match may have been missed, and using rolling periods may overcome this. Further, significant fatigue could be expected after intense 1 or 2 min periods, but this has not yet been investigated. Method: Using rolling 1-, 2-, and 5-min periods of matches, the greatest total (TD) and HiVR (>4.17 m s−1 ) distance and the subsequent 1-, 2- or 5-min epoch were identified in fourteen elite youth level male soccer players monitored using global positioning system technology (MinimaxX, Team Sports 2.0, Catapult Innovations, Melbourne, Australia) over five Men’s Under 21 matches. Differences were determined and expressed as % change and effect size (ES) statistic with 90% confidence intervals (CI). Results: Total distance was reduced substantially in the subsequent epoch following each 1-, 2- and 5-min period containing the highest TD in both the 1st and 2nd half of the match (1-min; −47.2%, −5.63 ± 0.56; and 52.5%, −4.73 ± 1.58; 2-min; 40.2%, −4.98 ± 0.52; and 36.5%, −4.22 ± 0.54; and 5-min; −24.6% −2.89 ± 0.38; and 24.5%, −2.51 ± 0.31 respectively). Highvelocity running followed the same pattern for both halves (1-min; −89%, −4.12 ± 0.33; and −92.8%, −3.71 ± 0.32; 2-min; −80.4% −3.38 ± 0.26; and −73.4%, −3.29 ± 0.33;
M. Casey 1,∗ , R. Eime 1 , K. Ball 2 , W. Payne 1 1 University 2 Deakin
of Ballarat, Australia University, Australia
Introduction: Physical activity (PA) research amongst men experiencing socioeconomic disadvantage is relatively scarce, despite the high risk of inactivity experienced by this group. This qualitative study compares experiences of men from low SES communities who have successfully and unsuccessfully engaged in PA. Methodology: Men aged 25–65 years from metropolitan inner-city suburbs and a non-metropolitan city were invited to participate through neighbourhood renewal and community health staff, and community advertisements. Data collection methods/instruments comprised a demographics form, semistructured interview, and administration of the International Physical Activity Questionnaire (IPAQ). Neighbourhood renewal and community health staff were also invited to participate in interviews. The socio-ecological model of health guided the interviews to explore individual, interpersonal, organisational, community, environmental and policy influences on PA. Content analysis was applied to identify key themes in the transcripts. Men were defined as active or inactive according to their total PA score based on the IPAQ, using a cutpoint of 600 MET minutes/week. Results: 25 men, aged 44.8 (range: 28–65) years participated; 12 were from metropolitan suburbs and 13 from a non-metropolitan city. They lived alone (n = 12), were not working (n = 7) or permanently unable to work (n = 11), and had no formal qualifications (n = 9) or Year 10 equivalency (n = 7). The context of participation in PA for both groups of men was mostly walking for leisure (n = 11 and n = 5, respectively) and/or transport (n = 10 and n = 4, respectively). Five active men had access to