Sources of Error in Determining Countermovement Jump Height with the Impulse Method

Street, Glenn M.; McMillan, Scott; Board, Wayne; Rasmussen, Mike; Heneghan, J. Michael

doi:10.1123/jab.17.1.43

Cited by 120 publications

(127 citation statements)

References 5 publications

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“…Then, the force-time curve was integrated by using the Trapezoidal method from a point prior to the initiation of the counter movement to the point of take-off (Feltner et al, 2004;Hanson et al, 2007;Linthorne, 2001;Moir, 2008;Street et al, 2001). Alternative net impulse was calculated as the isolated area under a force-time curve (Figure 1).…”

Section: Variable Measurements and Calculationsmentioning

confidence: 99%

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A new approach to determining net impulse and identification of its characteristics in countermovement jumping: reliability and validity

Mizuguchi

Sands

Wassinger

et al. 2015

Sports Biomechanics

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Examining a countermovement jump (CMJ) force-time curve related to net impulse might be useful in monitoring athletes' performance. This study aimed to investigate the reliability of alternative net impulse calculation and net impulse characteristics (height, width, rate of force development, shape factor, and proportion) and validate against the traditional calculation in the CMJ. Twelve participants performed the CMJ in two sessions (48 hours apart) for test-retest reliability. Twenty participants were involved for the validity assessment. Results indicated intra-class correlation coefficient (ICC) of ≥ 0.89 and coefficient of variation (CV) of ≤ 5.1% for all of the variables except for rate of force development (ICC = 0.78 and CV = 22.3%). The relationship between the criterion and alternative calculations was r = 1.00. While the difference between them was statistically significant (245.96 ± 63.83 vs. 247.14 ± 64.08 N s, p < 0.0001), the effect size was trivial and deemed practically minimal (d = 0.02). In conclusion, variability of rate of force development will pose a greater challenge in detecting performance changes. Also, the alternative calculation can be used practically in place of the traditional calculation to identify net impulse characteristics and monitor and study athletes' performance in greater depth.

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Section: Variable Measurements and Calculationsmentioning

confidence: 99%

“…Mizuguchi et al (Feltner et al, 2004;Hanson et al, 2007;Linthorne, 2001;Moir, 2008;Street, McMillan, Board, Rasmussen, & Heneghan, 2001). However, the integration of an entire force-time curve makes it impossible to identify what portion of a CMJ force-time curve represents net impulse.…”

mentioning

confidence: 95%

A new approach to determining net impulse and identification of its characteristics in countermovement jumping: reliability and validity

Mizuguchi

Sands

Wassinger

et al. 2015

Sports Biomechanics

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“…Using a forward dynamics approach, the force data were integrated to calculate velocity and displacement. The guidelines of Street et al (24) were used, which have been shown to allow for the most valid calculation of the JH.…”

Section: Jump Testing Data Analysismentioning

confidence: 99%

The Importance of Maximal Leg Strength for Female Athletes When Performing Drop Jumps

Barr

Nolte

2014

Journal of Strength and Conditioning Research

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A common suggestion is that a predetermined level of maximal leg strength is required before drop jump (DJ) training can begin. This study sought to examine the relationship between maximal squat strength (1 repetition maximum [RM]) and DJ performance in 15 female rugby players (n = 15). The subjects were tested for 1RM, countermovement jump, squat jump, and DJs from 0.24, 0.36, 0.48, 0.60, 0.72, and 0.84 m. Jump height (JH) was calculated for all jumps and relative peak eccentric force, relative peak concentric force, ground contact time (GCT), and reactive strength index were also calculated for DJs. Pearson correlations were used to examine the relationship between 1RM relative to body mass (BM) (1RM/BM) and JHs, reactive strength index, and GCT during DJs. The subjects were placed in a high strength (HS) or low strength (LS) group depending on whether or not their 1RM/BM was >1 or <1. The T-tests and 2-way analysis of variance (ANOVA) were used to compare the groups. A Fishers post hoc test was used for the ANOVA with significance set at p < 0.05. A large correlation between JH and 1RM/BM was shown at the 0.84-m dropping height (r = 0.56). A significant overall difference was found between the HS and LS groups for DJ JH with a post hoc analysis revealing a significant difference at the 0.84-m drop height (p = 0.029). It is likely beneficial for female athletes to achieve high levels of maximal leg strength if they are going to use high (>0.8-m) drop heights when performing DJs.

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“…After collection, the vertical component of the ground reaction force (GRF) time history was exported to a custom-built excel sheet for analysis. Body mass, jump start time, and take off were calculated using methods previously described (42).…”

Section: Neuromuscular Performancementioning

confidence: 99%

The Neuromuscular, Biochemical, and Endocrine Responses to a Single-Session Vs. Double-Session Training Day in Elite Athletes

Johnston

Cook

Drake

et al. 2016

Journal of Strength and Conditioning Research

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2The neuromuscular, biochemical, and endocrine responses to a single session versus double session training day in elite athletes. 3 AbstractPurpose: The aim of this study was to compare the acute neuromuscular, biochemical, and endocrine responses of a training day consisting of a speed session only to performing a speed and weight training session on the same day Methods:Fifteen male academy level rugby players completed two protocols in a randomized order. The speed only protocol involved performing 6 maximal effort repetitions of 50m running sprints with 5 minutes recovery between each sprint, while the speed and weights protocol involved the same sprinting session but was followed 2 h post by a lower body weights session consisting of 4 sets of 5 back squat and Romanian deadlift at 85% 1RM. Testosterone, cortisol, creatine kinase, lactate, and perceived muscle soreness were determined immediately before, immediately after, 2h post, and 24h post both protocols. Peak power, relative peak power, jump height, and average rate of force development were determined from a counter movement jump (CMJ) at the same time points. Results: At 24h post, muscle soreness was significantly higher following the speed and weights protocol compared to speed only protocol (effect size eta 2 = 0.253, F = 4.750, p < 0.05). There was no significant difference between any of the CMJ variables at any of the post training time points. Likewise creatine kinase, testosterone, and cortisol were unaffected by the addition of a weight training session. Conclusion:These data indicate that the addition of a weight training session 2h post a speed session, while increasing the perception of fatigue the following day, does not result in a difference in endocrine response or in neuromuscular capability.

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Sources of Error in Determining Countermovement Jump Height with the Impulse Method

Cited by 120 publications

References 5 publications

A new approach to determining net impulse and identification of its characteristics in countermovement jumping: reliability and validity

A new approach to determining net impulse and identification of its characteristics in countermovement jumping: reliability and validity

The Importance of Maximal Leg Strength for Female Athletes When Performing Drop Jumps

The Neuromuscular, Biochemical, and Endocrine Responses to a Single-Session Vs. Double-Session Training Day in Elite Athletes

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