Reliability of a Unilateral Horizontal Leg Power Test to Assess Stretch Load Tolerance

Cronin, John

doi:10.1207/s15327841mpee1003_3

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…In the second measurement, Cont_time lasted shorter on average (−3.58%). This trend of results (−1.43 to −5.58) was also determined when the test was performed from different landing distances [20]. Moreover, good reliability (ICC = 0.79) was obtained when performing a 40 cm HDJ in adult athletes with an average ground contact time of 370 ± 30 ms [27].…”

Section: Discussionsupporting

confidence: 56%

“…Before a UHDJ, the reliability for the jump distance (ICC = 0.95) and horizontal force (ICC = 0.96) were determined in adult athletes (22 ± 2.5 years) involved in multiple sports activities [18]. Dello Iacono et al [19] stated that the activation potentials generated after a HDJ significantly affect the results of changing the direction and speed of running at 20 m. Simspon and Cronin [20] investigated whether a change in the distance of the starting position relative to the landing point influences the result of the jump distance and vertical and horizontal force. The results show that the change in distance (80%, 120%, 160% of the leg length) does not affect the stated variables.…”

Section: Introductionmentioning

confidence: 99%

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Test-Retest Reliability of Unilateral Horizontal Drop Jump in Children

et al. 2021

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Jumps are an indispensable activity for the development of coordination, muscle strength and power, especially in children. Positive effects of horizontal drop jump (HDJ) proved to be very important in improving individuals performance. HDJ presents a specific movement pattern that has similarities with running gait and take-off in different horizontal jumps. Influence and effect of implementating HDJ in children is yet to be determined. The aim of this research was to determine the test–retest reliability of the unilateral horizontal drop jump (UHDJ) in children of early school age (6–7 years). Participants (n = 31; 19 girls and 12 boys) were school-age children that regularly attended Physical Education classes (Girls: mean age 7.5 ± 0.3 years, mean height 127.1 ± 6.8 cm and mean weight 25.8 ± 5.2 kg; Boys: mean age 7.5 ± 0.2 years, mean height 127.5 ± 6.9 cm and mean weight 27.6 ± 7.1 kg). UHDJ was performed from an elevation of 30 cm relative to the platform with starting position 120 cm from the middle of the platform. A jump on the platform and a unilateral take-off in the distance were performed, followed by a bilateral landing on the mat. Intraclass correlation coefficient was used to determine the reliability between the two days of measurements. Test–retest reliability was calculated for all observed variables, and a good correlation was found between the performed measurements (ICC = 0.76–0.89). The α coefficient indicates good to excellent (0.86–0.94) internal consistency. These findings suggest the usefulness of applying a UHDJ in school-age children. Moreover, it can be used to identify children talented for sports, monitor the effects of training and discover and direct individuals towards suitable sports disciplines.

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Section: Discussionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Test-Retest Reliability of Unilateral Horizontal Drop Jump in Children

et al. 2021

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“…The association between reactive strength and reactive agility has yet to be clearly established 3, so we examined this by comparing unilateral vertical, horizontal and lateral jump performance with performance on a video-based reactive agility test (8). The jumps chosen were considered a good measure of reactive strength under fast stretch-shorten cycle loading (24), which is the type of strength considered important in agility tasks (27,28,32). Additionally, modifying traditional single-leg drop-jumps to include jumps in multiple directions also more closely mimics the agility tasks, which also predominantly involve single-leg lateral and horizontal actions (3).…”

Section: Discussionmentioning

confidence: 99%

“…Copyright © National Strength and Conditioning Association Unauthorized reproduction of this article is prohibited. this is the fact that strength measures used previously have generally lacked ecological validity when compared to agility movements (3,24); some examples being bilateral and vertical movements such as countermovement jumps, squat jumps and back squats, often with low stretch-loads (14,17,22). In contrast, agility movements typically involve only one leg (3), under high stretch-shortening cycle loads (reactive strength) (27), producing a combination of vertical, horizontal and lateral ground reaction forces (3,19), yet strength measurements in these planes have rarely been used.…”

Section: A C C E P T E Dmentioning

confidence: 99%

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Relationships Between Reactive Agility Movement Time and Unilateral Vertical, Horizontal, and Lateral Jumps

Henry

Dawson

Lay

et al. 2016

Journal of Strength and Conditioning Research

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Henry, GJ, Dawson, B, Lay, BS, and Young, WB. Relationships between reactive agility movement time and unilateral vertical, horizontal, and lateral jumps. J Strength Cond Res 30(9): 2514-2521, 2016-This study compared reactive agility movement time and unilateral (vertical, horizontal, and lateral) jump performance and kinetics between dominant and nondominant legs in Australian rules footballers (n = 31) to investigate the role of leg strength characteristics in reactive agility performance. Jumps involved jumping forward on 1 leg, then for maximum height or horizontal or lateral distance. Agility and movement time components of reactive agility were assessed using a video-based test. Correlations between each of the jumps were strong (r = -0.62 to -0.77), but between the jumps and agility movement time the relationships were weak (r = -0.25 to -0.33). Dominant leg performance was superior in reactive agility movement time (4.5%; p = 0.04), lateral jump distance (3%; p = 0.008), and lateral reactive strength index (4.4%; p = 0.03) compared with the nondominant leg. However, when the subjects were divided into faster and slower performers (based on their agility movement times) the movement time was significantly quicker in the faster group (n = 15; 12%; p < 0.001), but no differences in jump performance or kinetics were observed. Therefore, although the capacity for jumps to predict agility performance seems limited, factors involved in producing superior lateral jump performance in the dominant leg may also be associated with advantages in agility performance in that leg. However, because reactive strength as measured by unilateral jumps seems to play a limited role in reactive agility performance and other factors such as skill, balance, and coordination, and also cognitive and decision-making factors, are likely to be more important.

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Temporal and kinetic analysis of unilateral jumping in the vertical, horizontal, and lateral directions

Meylan

Nosaka²,

Green³

et al. 2010

Journal of Sports Sciences

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The aims of this study were to: (1) assess the reliability of various kinetic and temporal variables for unilateral vertical, horizontal, and lateral countermovement jumps; (2) determine whether there are differences in vertical ground reaction force production between the three types of jumps; (3) quantify the magnitude of asymmetry between limbs for variables that were established as reliable in a healthy population and whether asymmetries were consistent across jumps of different direction; and (4) establish the best kinetic predictor(s) of jump performance in the vertical, horizontal, and lateral planes of motion. Thirty team sport athletes performed three trials of the various countermovement jumps on both legs on two separate occasions. Eccentric and concentric peak force and concentric peak power were the only variables with acceptable reliability (coefficient of variation = 3.3-15.1%; intra-class correlation coefficient = 0.70-0.96). Eccentric and concentric peak vertical ground reaction force (14-16%) and concentric peak power (45-51%) were significantly (P < 0.01) greater in the vertical countermovement jump than in the horizontal countermovement jump and lateral countermovement jump, but no significant difference was found between the latter two jumps. No significant leg asymmetries (-2.1% to 9.3%) were found in any of the kinetic variables but significant differences were observed in jump height and distance. The best single predictors of vertical countermovement jump, horizontal countermovement jump, and lateral countermovement jump performance were concentric peak vertical power/body weight (79%), horizontal concentric peak power/body weight (42.6%), and eccentric peak vertical ground reaction force/body weight (14.9%) respectively. These findings are discussed in relation to monitoring and developing direction-specific jump performance.

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Reliability of a Unilateral Horizontal Leg Power Test to Assess Stretch Load Tolerance

Cited by 8 publications

References 16 publications

Test-Retest Reliability of Unilateral Horizontal Drop Jump in Children

Test-Retest Reliability of Unilateral Horizontal Drop Jump in Children

Relationships Between Reactive Agility Movement Time and Unilateral Vertical, Horizontal, and Lateral Jumps

Temporal and kinetic analysis of unilateral jumping in the vertical, horizontal, and lateral directions

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