Asymmetry in lower body power production during a loaded single-leg step-up: Implications for injury risk assessment

2011 ◽  
Vol 14 ◽  
pp. e41
Author(s):  
B. Appleby ◽  
P. Cormie
Keyword(s):  
Risk Assessment ◽  
Injury Risk ◽  
Power Production ◽  
Lower Body ◽  
Lower Body Power

Influence of Rest Interval Duration on Muscular Power Production in the Lower-Body Power Profile

2013 ◽  
Vol 27 (10) ◽  
pp. 2723-2729 ◽  
Author(s):  
Maria L. Nibali ◽  
Dale W. Chapman ◽  
Robert A. Robergs ◽  
Eric J. Drinkwater
Keyword(s):  
Power Production ◽  
Lower Body ◽  
Interval Duration ◽  
Rest Interval ◽  
Muscular Power ◽  
Power Profile ◽  
Lower Body Power

scholarly journals A Preliminary Investigation: Evaluating the Effectiveness of an Occupational Specific Training Program to Improve Lower Body Strength and Speed for Law Enforcement Officers

2021 ◽  
Vol 18 (14) ◽  
pp. 7685
Author(s):  
Ian Bonder ◽  
Andrew Shim ◽  
Robert G. Lockie ◽  
Tara Ruppert
Keyword(s):  
Law Enforcement ◽  
Training Program ◽  
Injury Risk ◽  
Preliminary Investigation ◽  
Lower Body ◽  
Specific Training ◽  
Body Strength ◽  
Post Test ◽  
Lower Body Strength ◽  
Post Shift

Based on current law enforcement officer (LEO) duties, musculoskeletal injury risk is elevated due to the unpredictable nature of physically demanding tasks. The purpose of this 4-week study was to determine the effectiveness of a 15-min post-shift standardized occupational specific training program. The standardized program was designed to improve lower-body strength and speed to aid physically demanding task performance. Seven male LEOs completed the program after their 12-h shift. Subjects were required to use the department fitness center to perform the 15-min standardized program consisting of a dynamic warm-up, 4 sets of 3 repetitions on hex-bar deadlift and four 20-m sprints. Two minutes of rest was required between each set of 3 repetitions on hex-bar deadlift and 1 min of rest between each 20-m sprint. A dependent T-test was used between pre-test and post-test scores for hex-bar deadlift (HBD) and sprint. Data revealed significant improvements in relative lower-body strength with HBD (p ≤ 0.001). However, insignificant results were demonstrated with the 20-m sprint (p ≤ 0.262). In conclusion, a 15-min post-shift workout can improve lower-body strength as measured by the hex-bar deadlift. However, data indicated running speed may require a different training approach to improve the 20-m sprint.

scholarly journals Effects of the lower jaw position on athletic performance of elite athletes

2020 ◽  
Vol 6 (1) ◽  
pp. e000886
Author(s):  
John Patrick Haughey ◽  
Peter Fine
Keyword(s):  
Athletic Performance ◽  
Positive Impact ◽  
Elite Athletes ◽  
Upper Body ◽  
Lower Body ◽  
Lower Jaw ◽  
Hamstring Flexibility ◽  
Jaw Position ◽  
Upper Body Power ◽  
Lower Body Power

When an athlete wears a mouthguard, the position of the lower jaw is changed by virtue of the teeth being unable to occlude. Little research is available in in this area, which have indicated both positive impact and no positive impact.ObjectivesThis study aims to explore the influence of the lower jaw position on athletic performance in elite athletes.MethodsA repeated measures study compared two lower jaw positions, the athlete’s normal (habitual) bite and the lower jaw position when the muscles of mastication are at physiological rest (physiological rest bite). 15 athletes completed a medicine ball putt (upper body power), vertical jump (lower body power), sit and reach (composite hamstring flexibility), passive knee flexion (hamstring muscle length) and star excursion balance (stability and balance) tests in each condition.ResultsPaired t-tests showed the physiological rest bite had significant (p<0.05) positive effect on athletic performance for each test. On average the physiological rest bite provided an increase of lower body power (5.8%), upper body power (10%), hamstring flexibility (14%) and balance and stability (4.8%) compared to the habitual bite.ConclusionThis study provides evidence of the need for further research to confirm if the lower jaw position can be optimised for athletic performance in athletes.

scholarly journals Influence of Playing Standard on Upper- and Lower-Body Strength, Power, and Velocity Characteristics of Elite Rugby League Players

2019 ◽  
Vol 4 (2) ◽  
pp. 22 ◽  
Author(s):  
John F. T. Fernandes ◽  
Matthew Daniels ◽  
Liam Myler ◽  
Craig Twist
Keyword(s):  
Bench Press ◽  
Peak Velocity ◽  
First Grade ◽  
Rugby League ◽  
Power Relationships ◽  
Lower Body ◽  
Body Strength ◽  
Lower Body Strength ◽  
Lower Body Power ◽  
Level Resistance

Background: To compare load–velocity and load–power relationships among first grade (n = 26, age 22.9 ± 4.3 years), academy (n = 23, age 17.1 ± 1.0 years), and scholarship (n = 16, age 15.4 ± 0.5 years) Super League rugby league players. Methods: Participants completed assessments of maximal upper- and lower-body strength (1RM) and peak velocity and power at 20, 40, 60, and 80 kg during bench press and squat exercises, in a randomised order. Results: Bench press and squat 1RM were highest for first grade players compared with other standards (effect size (ES) = −0.43 to −3.18). Peak velocities during bench and squat were greater in the higher playing standards (ES = −0.39 to −3.72 range), except for the squat at 20 and 40 kg. Peak power was higher in the better playing standards for all loads and exercises. For all three groups, velocity was correlated to optimal bench press power (r = 0.514 to 0.766), but only 1RM was related to optimal power (r = 0.635) in the scholarship players. Only squat 1RM in the academy was related to optimal squat power (r = 0.505). Conclusions: Peak velocity and power are key physical qualities to be developed that enable progression from junior elite rugby league to first grade level. Resistance training should emphasise both maximal strength and velocity components, in order to optimise upper- and lower-body power in professional rugby league players.

Injury risk assessment based on pre-crash variables: The role of closing velocity and impact eccentricity

2021 ◽  
Vol 150 ◽  
pp. 105864
Author(s):  
Michelangelo-Santo Gulino ◽  
Leonardo Di Gangi ◽  
Alessio Sortino ◽  
Dario Vangi
Keyword(s):  
Risk Assessment ◽  
Injury Risk

scholarly journals Inter-Rater Reliability of a Pressure Injury Risk Assessment Scale for Home Care: A Multicenter Cross-Sectional Study

2020 ◽  
Vol Volume 13 ◽  
pp. 2031-2041
Author(s):  
Masushi Kohta ◽  
Takehiko Ohura ◽  
Kunio Tsukada ◽  
Yoshinori Nakamura ◽  
Mishiho Sukegawa ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Home Care ◽  
Injury Risk ◽  
Cross Sectional Study ◽  
Assessment Scale ◽  
Sectional Study ◽  
Cross Sectional ◽  
Rater Reliability ◽  
Pressure Injury

scholarly journals Risk assessment of freezing injury during overwintering of wheat in the northern boundary of the Winter Wheat Region in China

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12154
Author(s):  
Jiahui Guo ◽  
Xionghui Bai ◽  
Weiping Shi ◽  
Ruijie Li ◽  
Xingyu Hao ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Winter Wheat ◽  
Injury Risk ◽  
Climate Models ◽  
Meteorological Data ◽  
Wheat Variety ◽  
Freezing Injury ◽  
Short Term ◽  
Northern Boundary ◽  
Significant Downward Trend

Freezing injury is one of the main restriction factors for winter wheat production, especially in the northern part of the Winter Wheat Region in China. It is very important to assess the risk of winter wheat-freezing injury. However, most of the existing climate models are complex and cannot be widely used. In this study, Zunhua which is located in the northern boundary of Winter Wheat Region in China is selected as research region, based on the winter meteorological data of Zunhua from 1956 to 2016, seven freezing disaster-causing factors related to freezing injury were extracted to formulated the freezing injury index (FII) of wheat. Referring to the historical wheat-freezing injury in Zunhua and combining with the cold resistance identification data of the National Winter Wheat Variety Regional Test (NWWVRT), consistency between the FII and the actual freezing injury situation was tested. Furthermore, the occurrence law of freezing injury in Zunhua during the past 60 years was analyzed by Morlet wavelet analyze, and the risk of freezing injury in the short term was evaluated. Results showed that the FII can reflect the occurrence of winter wheat-freezing injury in Zunhua to a certain extent and had a significant linear correlation with the dead tiller rate of wheat (P = 0.014). The interannual variation of the FII in Zunhua also showed a significant downward trend (R2 = 0.7412). There are two cycles of freezing injury in 60 years, and it showed that there’s still exist a high risk in the short term. This study provides reference information for the rational use of meteorological data for winter wheat-freezing injury risk assessment.

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