- Authors: Young, Warren , Behm, David
- Date: 2003
- Type: Text , Journal article
- Relation: Journal of Sports Medicine and Physical Fitness Vol. 43, no. 1 (2003), p. 21-27
- Full Text: false
- Reviewed:
- Description: Aim. The interaction between running, stretching and practice jumps during warm-up for jumping tests has not been investigated. The purpose of the present study was to compare the effects of running, static stretching of the leg extensors and practice jumps on explosive force production and jumping performance. Methods. Sixteen volunteers (13 male and 3 female) participated in five different warm-ups in a randomised order prior to the performance of two jumping tests. The warm-ups were control, 4 min run, static stretch, run + stretch, and run + stretch + practice jumps. After a 2 min rest, a concentric jump and a drop jump were performed, which yielded 6 variables expressing fast force production and jumping performance of the leg extensor muscles (concentric jump height, peak force, rate of force developed, drop jump height, contact time and height/time). Results. Generally the stretching warm-up produced the lowest values and the run or run + stretch + jumps warm-ups produced the highest values of explosive force production. There were no significant differences (p<0.05) between the control and run + stretch warm-ups, whereas the run yielded significantly better scores than the run + stretch warm-up for drop jump height (3.2%), concentric jump height (3.4%) and peak concentric force (2.7%) and rate of force developed (15.4%). Conclusion. The results indicated that submaximum running and practice jumps had a positive effect whereas static stretching had a negative influence on explosive force and jumping performance. It was suggested that an alternative for static stretching should be considered in warm-ups prior to power activities.
- Description: C1
- Description: 2003000536
Is muscle power related to running speed with changes of direction?
- Young, Warren, James, R., Montgomery, Iain
- Authors: Young, Warren , James, R. , Montgomery, Iain
- Date: 2002
- Type: Text , Journal article
- Relation: Journal of Sports Medicine and Physical Fitness Vol. 42, no. 3 (Sep 2002), p. 282-288
- Full Text: false
- Reviewed:
- Description: Background. The purpose of this study was to identify the relationships between leg muscle power and sprinting speed with changes of direction. Methods. Experimental design: the study was designed to describe relationships between physical qualities and a component of sports performance: Setting: testing was conducted in an indoor sports hall and a biomechanics laboratory. Participants: 15 male participants were required to be free of injury and have recent experience competing in sports involving sprints with changes of direction. Measures: subjects were timed in 8 m sprints in a straight line and with various changes of direction. They were also tested for bilateral and unilateral leg extensor muscle concentric power output by an isokinetic squat and reactive strength by a drop jump. Results. The correlations between concentric power and straight sprinting speed were non-significant whereas the relationships between reactive strength and straight speed were statistically significant. Correlations between muscle power and speed while changing direction were generally low and non-significant for concentric leg power with some moderate and significant (p<0.05) coefficients found for reactive strength. The participants who turned faster to one side tended to have a reactive strength dominance in the leg responsible for the push-off action. Conclusions. The relationships between leg muscle power and change-of-direction speed were not consistent. Reactive strength as measured by the drop jump appears to have some importance for lateral change-of-direction speed, possibly because of similar push-off actions. It was concluded that reactive strength of the leg extensor muscles has some importance in change-of-direction performance but the other technical and perceptual factors than influence agility performance should also be considered.
- Description: 2003000213
Injury surveillance in the professional football codes : An overview of current data collection, injury definition and reporting practices
- Shaw, Louise, Orchard, John, Saw, Richard, Finch, Caroline
- Authors: Shaw, Louise , Orchard, John , Saw, Richard , Finch, Caroline
- Date: 2017
- Type: Text , Journal article , Review
- Relation: Minerva Ortopedica e Traumatologica Vol. 68, no. 2 (2017), p. 110-123
- Full Text:
- Reviewed:
- Description: INTRODUCTION: Whilst football has been found to have many positive effects from a health perspective, injuries are common, particularly at the elite or professional level of play. Injury surveillance is therefore required to inform the development and implementation of strategies to increase safety in professional football codes. EVIDENCE ACQUISITION: A systematic search of peer reviewed and available grey literature was conducted to identify publications presenting methodological details of ongoing injury surveillance systems in professional football codes. Data extracted included population under surveillance, player/team coverage, injury definition and other relevant information. EVIDENCE SYNTHESIS: Following literature search and review, seven injury surveillance systems were identified that record ongoing data within professional football codes. A range of methodologies was used across the surveillance systems with variations in the definitions of injury, who records the data, the data-recording tool and dissemination of the data. CONCLUSIONS: There are many benefits for football associations, clubs and players themselves in conducting comprehensive injury surveillance. A range of surveillance methods is employed across the different football codes including injury definitions. Some professional football codes have developed consensus statements, which provide guidance on key issues relating to injury surveillance. Dissemination of findings differed with some systems publishing via peer review journals, with others through annual disclosure to the media. Financial considerations and funding are a crucial factor for creating and maintaining an injury surveillance system. Findings from professional football injury surveillance have been used to implement rule changes and develop preventive programmes, all aimed at increasing player safety.
- Authors: Shaw, Louise , Orchard, John , Saw, Richard , Finch, Caroline
- Date: 2017
- Type: Text , Journal article , Review
- Relation: Minerva Ortopedica e Traumatologica Vol. 68, no. 2 (2017), p. 110-123
- Full Text:
- Reviewed:
- Description: INTRODUCTION: Whilst football has been found to have many positive effects from a health perspective, injuries are common, particularly at the elite or professional level of play. Injury surveillance is therefore required to inform the development and implementation of strategies to increase safety in professional football codes. EVIDENCE ACQUISITION: A systematic search of peer reviewed and available grey literature was conducted to identify publications presenting methodological details of ongoing injury surveillance systems in professional football codes. Data extracted included population under surveillance, player/team coverage, injury definition and other relevant information. EVIDENCE SYNTHESIS: Following literature search and review, seven injury surveillance systems were identified that record ongoing data within professional football codes. A range of methodologies was used across the surveillance systems with variations in the definitions of injury, who records the data, the data-recording tool and dissemination of the data. CONCLUSIONS: There are many benefits for football associations, clubs and players themselves in conducting comprehensive injury surveillance. A range of surveillance methods is employed across the different football codes including injury definitions. Some professional football codes have developed consensus statements, which provide guidance on key issues relating to injury surveillance. Dissemination of findings differed with some systems publishing via peer review journals, with others through annual disclosure to the media. Financial considerations and funding are a crucial factor for creating and maintaining an injury surveillance system. Findings from professional football injury surveillance have been used to implement rule changes and develop preventive programmes, all aimed at increasing player safety.
The effects of sprint training and the Nordic hamstring exercise on eccentric hamstring strength and sprint performance in adolescent athletes
- Freeman, Brock, Young, Warren, Talpey, Scott, Smyth, Andrew, Pane, Calvin, Carlon, Todd
- Authors: Freeman, Brock , Young, Warren , Talpey, Scott , Smyth, Andrew , Pane, Calvin , Carlon, Todd
- Date: 2019
- Type: Text , Journal article
- Relation: Journal of Sports Medicine and Physical Fitness Vol. 59, no. 7 (2019), p. 1119-1125
- Full Text:
- Reviewed:
- Description: BACKGROUND. Hamstring strain injuries (HSI) are among the most common injuries in field-based team sports with a high-speed running component. The implementation of the Nordic hamstring exercise (NHE) is a well-documented method of improving eccentric hamstring strength to mitigate the risk of HSI occurrence. Sprint training is specific to the injury mechanism and is thought to activate the hamstrings through maximal eccentric contractions. The purpose of this study was to compare the effects of sprint training and the NHE on eccentric hamstring strength and sprint performance. METHODS. Twenty-eight participants (mean +/- SD age=16.21 +/- 1.34 years; height=1.75m +/- 0.10m; body mass=68.5kg +/- 12.1kg) completed an eccentric hamstring strength assessment and 40m sprint to assess acceleration and maximum speed. Participants were randomly allocated to either a NHE training or sprint training group. Two sessions per week for four-weeks of training was performed with baseline testing procedures repeated in the week following the intervention. Perceptions of soreness were recorded following the warm-up in each training session. RESULTS. Both the NHE (effect size=0.39, P<0.05) and sprint training (effect size=0.29, P<0.05) groups displayed significant gains in eccentric hamstring strength. The NHE group reported trivial improvements in sprint performance, whilst the sprint training group experienced a moderate improvement, specifically in maximum speed (ES=0.83 Moderate). Sprint training also produced greater perceptions of soreness than the NHE following a four-week training intervention, specifically before the start of the last session (P<0.05). CONCLUSIONS. These findings indicate that sprint training had a beneficial effect for both eccentric hamstring strength and sprint performance, whilst also producing greater soreness than the NHE following the final training session. It was concluded that a four-week block of maximum speed training may have both an injury prevention and performance enhancement benefit.
- Authors: Freeman, Brock , Young, Warren , Talpey, Scott , Smyth, Andrew , Pane, Calvin , Carlon, Todd
- Date: 2019
- Type: Text , Journal article
- Relation: Journal of Sports Medicine and Physical Fitness Vol. 59, no. 7 (2019), p. 1119-1125
- Full Text:
- Reviewed:
- Description: BACKGROUND. Hamstring strain injuries (HSI) are among the most common injuries in field-based team sports with a high-speed running component. The implementation of the Nordic hamstring exercise (NHE) is a well-documented method of improving eccentric hamstring strength to mitigate the risk of HSI occurrence. Sprint training is specific to the injury mechanism and is thought to activate the hamstrings through maximal eccentric contractions. The purpose of this study was to compare the effects of sprint training and the NHE on eccentric hamstring strength and sprint performance. METHODS. Twenty-eight participants (mean +/- SD age=16.21 +/- 1.34 years; height=1.75m +/- 0.10m; body mass=68.5kg +/- 12.1kg) completed an eccentric hamstring strength assessment and 40m sprint to assess acceleration and maximum speed. Participants were randomly allocated to either a NHE training or sprint training group. Two sessions per week for four-weeks of training was performed with baseline testing procedures repeated in the week following the intervention. Perceptions of soreness were recorded following the warm-up in each training session. RESULTS. Both the NHE (effect size=0.39, P<0.05) and sprint training (effect size=0.29, P<0.05) groups displayed significant gains in eccentric hamstring strength. The NHE group reported trivial improvements in sprint performance, whilst the sprint training group experienced a moderate improvement, specifically in maximum speed (ES=0.83 Moderate). Sprint training also produced greater perceptions of soreness than the NHE following a four-week training intervention, specifically before the start of the last session (P<0.05). CONCLUSIONS. These findings indicate that sprint training had a beneficial effect for both eccentric hamstring strength and sprint performance, whilst also producing greater soreness than the NHE following the final training session. It was concluded that a four-week block of maximum speed training may have both an injury prevention and performance enhancement benefit.
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