Reliability of an Active-Knee-Extension Test for Determining Hamstring Muscle Flexibility

1992 ◽  
Vol 1 (3) ◽  
pp. 181-187 ◽  
Author(s):  
Teddy W. Worrell ◽  
Michael K. Sullivan ◽  
Joseph J. DeJulia
Keyword(s):  
Confidence Interval ◽  
Confidence Intervals ◽  
Intraclass Correlation ◽  
Muscle Length ◽  
Correlation Coefficients ◽  
Accurate Method ◽  
Knee Extension ◽  
Hamstring Muscle ◽  
Intraclass Correlation Coefficients ◽  
Hamstring Flexibility

This study examined the intratester and intertester reliability of an active-knee-extension test (AKET) for determining hamstring muscle length (flexibility). Three testers performed repeated AKET measurements on 22 subjects. Intraclass correlation coefficients (ICC were used to calculate intratester and intertester reliability. Also, standard error of measurements (SEM) were calculated. The ICC and SEM were .96 and 1.82°, respectively, for Tester 1, .99 and 1.75° for Tester 2, and .99 and 1.80° for Tester 3. Intratester 95% confidence intervals ranged from 60.54 to 69.82°. Intertester ICC and SEM for two testers were .93 and 4.81°, respectively. A 95% intertester confidence interval ranged from 56.35 to 75.21 °; this reveals that intertester AKET values contained more error and suggests that only intratester AKET values should be used when comparing hamstring flexibility values. The AKET may provide a more accurate method for determining hamstring flexibility and quantifying changes that occur as a result of injury and stretching procedures.

scholarly journals Is there a relationship between the overhead press and split jerk maximum performance? Influence of sex

2021 ◽  
pp. 174795412110204
Author(s):  
Marcos A Soriano ◽  
G Gregory Haff ◽  
Paul Comfort ◽  
Francisco J Amaro-Gahete ◽  
Antonio Torres-González ◽  
...  
Keyword(s):  
Confidence Intervals ◽  
Body Mass ◽  
Upper Limb ◽  
High Reliability ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Training Experience ◽  
Maximum Performance ◽  
Repetition Maximum ◽  
Intraclass Correlation Coefficients

The aims of this study were to (I) determine the differences and relationship between the overhead press and split jerk performance in athletes involved in weightlifting training, and (II) explore the magnitude of these differences in one-repetition maximum (1RM) performances between sexes. Sixty-one men (age: 30.4 ± 6.7 years; height: 1.8 ± 0.5 m; body mass 82.5 ± 8.5 kg; weightlifting training experience: 3.7 ± 3.5 yrs) and 21 women (age: 29.5 ± 5.2 yrs; height: 1.7 ± 0.5 m; body mass: 62.6 ± 5.7 kg; weightlifting training experience: 3.0 ± 1.5 yrs) participated. The 1RM performance of the overhead press and split jerk were assessed for all participants, with the overhead press assessed on two occasions to determine between-session reliability. The intraclass correlation coefficients (ICC) and 95% confidence intervals showed a high reliability for the overhead press ICC = 0.98 (0.97 – 0.99). A very strong correlation and significant differences were found between the overhead press and split jerk 1RM performances for all participants (r = 0.90 [0.93 – 0.85], 60.2 ± 18.3 kg, 95.7 ± 29.3 kg, p ≤ 0.001). Men demonstrated stronger correlations between the overhead press and split jerk 1RM performances (r = 0.83 [0.73-0.90], p ≤ 0.001) compared with women (r = 0.56 [0.17-0.80], p = 0.008). These results provide evidence that 1RM performance of the overhead press and split jerk performance are highly related, highlighting the importance of upper-limb strength in the split jerk maximum performance.

Influence of Handgrip Stabilization During Isokinetic Knee Strength Assessment in Older Women

2020 ◽  
Vol 127 (4) ◽  
pp. 671-683
Author(s):  
João P. Nunes ◽  
Paolo M. Cunha ◽  
Jerry L. Mayhew ◽  
Alex S. Ribeiro ◽  
Paulo S. Junior ◽  
...  
Keyword(s):  
Older Women ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Knee Extension ◽  
Convenience Sample ◽  
Strength Assessment ◽  
Intraclass Correlation Coefficients ◽  
Knee Strength ◽  
Hands On ◽  
Angular Velocities

The present study aimed to evaluate the influence of holding the chair handles during the assessment of older women’s knee flexion and extension isokinetic and isometric strength. Of 57 older women (≥60 years) selected from a convenience sample for this research, 23 were randomly chosen to perform the tests twice for reliability analyses. Each participant performed maximal isokinetic knee extension and flexion at 60°/s and 180°/s angular velocities and isometric tests under two conditions: (a) holding the lateral handle of the chair (HOLD) and (b) supporting the hands on the shoulders with the arms crossed (i.e., not holding the handle [NHOLD]). Participants performed significantly better in the HOLD compared with the NHOLD condition. Slightly lower intraclass correlation coefficients (ICC = 0.870–0.956) were noted for the HOLD than for the NHOLD condition (ICC = 0.900–0.981) so that the HOLD performance on Days 1 and 2 was different on some measures. Owing to the higher reliability coefficients in the NHOLD condition, results suggest that, when assessing knee strength in older women, the evaluee should place their hands over their shoulders with arms crossed in front of the chest (NHOLD) to maximize assessment reliability (reproducibility of performance).

scholarly journals THE EFFECT OF MUSCLE ENERGY TECHNIQUE ON FLEXIBILITY OF HAMSTRING MUSCLE IN FUTSAL PLAYERS

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Shenbaga Sundaram Subramanian
Keyword(s):  
Muscle Length ◽  
Knee Extension ◽  
Hamstring Muscle ◽  
Muscle Injuries ◽  
Muscle Energy Technique ◽  
Hamstring Muscles ◽  
Before And After ◽  
Direction Of Movement ◽  
Muscle Energy ◽  
Hamstring Flexibility

Futsal is an upcoming popular sport in the industry, it is an active dynamic sport which requires the players to perform various movements like rapidly accelerating and decelerating, it also requires them to rapidly change their direction of movement, it also involves a lot of sliding and kicking. Compared to other athletic sports played worldwide, futsal is a rather vigorous sport with increased incidence of injuries. Tightness in the hamstring muscles can lead to various injuries. The prevalence of hamstring muscle injuries is very high in futsal players due to muscle tightness. This study aims to determine the effects of Muscle Energy Technique (MET) on hamstring flexibility among futsal players. After being screened as per the inclusion and exclusion criteria, the participants were given the chronic implication of MET where the technique was performed for seven to ten seconds with twenty percent of resistive effort synchronized with the breathing pattern of the participant and then stretched to the new muscle length, this was repeated until no further gain was possible. The hamstring length was assessed using the Active Knee Extension Test (AKET) before and after the intervention, the values were then compared. The result of the study had shown an improvement in the hamstring length following the intervention (16.50) to be statistically significant (P <0.01) when compared to the baseline findings (23.67). It has been concluded that MET can increase the hamstring flexibility among futsal players, thus it will be able to reduce the injury rate.Keywords: Hamstring Flexibility, Muscle Energy Technique, Hamstring tightness,Futsal Players, Active Knee Extension.

Selection of Resistance Exercise Intensity Using Ratings of Perceived Exertion from the OMNI—RES

2009 ◽  
Vol 108 (2) ◽  
pp. 573-586 ◽  
Author(s):  
Kristen M. Lagally ◽  
Anthony J. Amorose ◽  
Brandi Rock
Keyword(s):  
Resistance Exercise ◽  
Perceived Exertion ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Knee Extension ◽  
Ratings Of Perceived Exertion ◽  
Muscular Fitness ◽  
Average Percentage ◽  
Intraclass Correlation Coefficients ◽  
Selection Of

This investigation evaluated the use of OMNI–Resistance Exercise Scale ratings of perceived exertion as a method for selecting training intensities that are appropriate for improving muscular fitness. 20 women ( M = 21.3 yr., SD = 2.2) completed a one-repetition maximum for the chest press and knee extension. Participants returned for three sessions during which they were asked to select resistances which elicited the feelings of exertion associated with ratings of 3 (i.e., Easy to Somewhat easy), 6 (i.e., Somewhat hard) and 9 (i.e., Hard to Extremely hard). The average percentage of maximum lifted at a 3, 6, and 9 was 50, 69, and 88% for the chest press and 56, 74, and 90% for the knee extension, respectively. Effect sizes indicated large differences across the three ratings of perceived exertion within sessions and small differences between sessions. Intraclass correlation coefficients ranged from .69 to .95. The results indicated that OMNI–Resistance Exercise Scale ratings of 3, 6, and 9 can be used to accurately and reliably select intensities that are appropriate for improving muscular fitness.

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