Impact of Hydration Status on Electromyography and Ratings of Perceived Exertion During the Vertical Jump

Donahue, Paul T.; Wilson, Samuel J.; Williams, Charles C.; Valliant, Melinda; Garner, James W.

doi:10.7575/aiac.ijkss.v.7n.4p.1

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…Raw vertical ground reaction force data were exported and analyzed using a customized Excel spreadsheet (Microsoft, Redmond, WA). The spreadsheet was modeled using methods previously described and used in prior investigations (3,(5)(6)(7). Phases of CMJ were defined using the methods and terminology presented by McMahon et al (16).…”

Section: Discussionmentioning

confidence: 99%

Examining Countermovement Jump Strategies Between Women's NCAA Division I Sports

Donahue,

Peel,

Rush

et al. 2023

Journal of Strength and Conditioning Research

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Donahue, PT, Peel, SA, Rush, M, McInnis, AK, Littlefield, T, Calci, C, and Brutofsky, T. Examining countermovement jump strategies between women’s NCAA Division I sports. J Strength Cond Res 37(10): 2052–2057, 2023—The purpose of this study was to examine countermovement vertical jump performance among female athletes who rely heavily on vertical jump performance within their given sport. Forty-five female athletes representing 3 teams (basketball, volleyball, and beach volleyball) competing at the NCAA Division I level completed 2 maximal effort countermovement jumps (CMJ) using a portable force platform. A 1-way analysis of variance was used to compare groups across each variable. Statistically significant differences were found between the groups regarding propulsive duration and time to takeoff with basketball showing the shortest time and beach volleyball having the longest times (p < 0.05). In addition, differences were seen in countermovement depth and mean propulsive force between the groups with basketball displaying the smallest countermovement and highest force (p < 0.05). No differences were seen in jump height and reactive strength index modified. Greater force and shorter durations in basketball athletes versus the low force and long durations in the beach volleyball athletes suggest that sporting backgrounds play a large role in how the CMJ is performed. This information can aid strength and conditioning practitioners in the design of training programs that are sport specific to the strategies used by the athlete.

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Section: Discussionmentioning

confidence: 99%

Examining Countermovement Jump Strategies Between Women's NCAA Division I Sports

Donahue,

Peel,

Rush

et al. 2023

Journal of Strength and Conditioning Research

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“…The identification of the end of the propulsive phase and beginning of the flight phase was determined by methods described by Chavda et al (Chavda et al, 2018). Relative thresholds were determined as the given percentage (2.5%, 5%, and 10%) of this SW. All variables were calculated using a customized Excel spreadsheet (Donahue et al, 2019(Donahue et al, , 2020.…”

Section: Discussionmentioning

confidence: 99%

“…It has been proposed that the use of taking a value that is 5 times the standard deviation (5SD) of an individual's mass during one second of quite standing can be used as the onset movement threshold (Owen et al, 2014). The use of the 5SD threshold has been recommended in both the CMJ the IMTP (Chavda et al, 2018;Dos'Santos et al, 2017;McMahon et al, 2018), and been used in recent investigations using the SJ (Donahue et al, 2019(Donahue et al, , 2020. The impact of differing onset thresholds has been examined in the CMJ and the proposed 5SD has been shown to provide the best reliability to the variables of interest and preserves a large portion of the force-time curve to be analysed (Owen et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Squat Jump Movement Onset Thresholds Influence on Kinetics and Kinematics

Donahue

Hill

Wilson

et al. 2021

IJKSS

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Background of Study: Differing movement onset thresholds have been used when analyzing the squat jump movement from force-time data obtained from a force platform. This makes comparisons difficult between investigations as this will impact the amount of the force-time curve that is analyzed. Objective: Thus, study examined the effect onset threshold had on kinetic and kinematic variables used in the assessment of the squat jump. Methods: Using a within-subject study design, fifteen recreational trained males performed three trials of squat jumps on a force platform. Each trial was analyzed using one of five different onset thresholds (2.5% SW, 5% SW, 10% SW, 20N, 5SD). Force, velocity, and power, as well as time to peak force, velocity, power and jump height were calculated using the vertical force data obtain from the force plate. Reliability was assessed using intraclass correlation coefficients and coefficients of variation. A one-way ANOVA was used to examine the impact of onset thresholds on all variables of interest. Results: The use of 10% SW and 5SD met minimum reliability criteria for all variables. Temporal related variables were impact to the greatest extent by differing thresholds with large (d > 1.20) significant differences. 10% SW showed the highest mean values of force, velocity, and power. Conclusions: The use of 5SD of the weighting phase is recommended as this showed high level of both absolute and relative reliability in addition to preserving a large portion of the force – time curve to be used in the analysis.

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“…Surface electromyography (EMG) was recorded at 1000 Hz using an 8-channel Noraxon Telemyo DTS 900 system (Noraxon USA, INC, Scottsdale, AZ, USA) synced with Vicon Nexus (Oxford, UK) motion capture software. Three, five-second barefoot MVIC trials separated by 30 s were completed for each muscle of interest and were obtained during knee flexion (semitendinosus), knee extension (vastus medialis), dorsiflexion (tibialis anterior), and plantarflexion (medial gastrocnemius) (Allen et al, 2016;Donahue et al, 2019;Wilson et al, 2018). Knee flexion and extension had participants pull and push, respectively, into a padded weight bench with a leg attachment.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Shoe and Cleat Type on Lower Extremity Muscle Activation in Youth Baseball Pitchers

Gdovin

Wade

Luginsland

et al. 2022

IJKSS

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Background: Baseball pitching is a dynamic movement where the lower extremities generate and sequentially transfer energy to the upper extremities to maximize ball velocity. The need for lower body muscular strength to produce adequate push-off and landing forces has been documented; however, the influence footwear and surface inclination has on muscle activation remains unknown. Objectives: Determine how pitching in molded cleats and turf shoes from a pitching mound and flat ground affects stride-leg muscle activation in youth baseball pitchers while determining percent activation during each pitching phase. Methods: Cross – sectional study analyzing mean muscle activity and percent activation of the vastus medialis, semitendinosus, tibialis anterior, and medial gastrocnemius on the stride-leg of 11 youth baseball pitchers when pitching fastballs. Results: Footwear did not significantly alter vastus medialis or semitendinosus muscle activation (P 0.05). The turf shoe x pitching mound interaction elicited significantly (P 0.05) greater mean muscle activity in the medial gastrocnemius and tibialis anterior from stride foot contact to maximum glenohumeral internal rotation. Molded cleats produced greater activation levels in the tibialis anterior on flat ground from stride foot contact (0.374 ± 0.176 mV) to ball release (0.469 ± 0.150 mV). Conclusion: Findings suggest footwear significantly alters the activity level of the ankle stabilizing musculature. Youth baseball pitchers and coaches should be cognizant of what footwear is worn on a pitching surface. Maximal activation of the tibialis anterior and medial gastrocnemius can ensure the stride leg is adequately stabilized to absorb the momentum generated by trail leg.

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Impact of Hydration Status on Electromyography and Ratings of Perceived Exertion During the Vertical Jump

Cited by 4 publications

References 22 publications

Examining Countermovement Jump Strategies Between Women's NCAA Division I Sports

Examining Countermovement Jump Strategies Between Women's NCAA Division I Sports

Squat Jump Movement Onset Thresholds Influence on Kinetics and Kinematics

The Influence of Shoe and Cleat Type on Lower Extremity Muscle Activation in Youth Baseball Pitchers

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