A Comparative Analysis of Selected Ankle Orthoses during Functional Tasks

2001 ◽  
Vol 10 (3) ◽  
pp. 174-183 ◽  
Author(s):  
James A. Yaggie ◽  
Stephen J. Kinzey
Keyword(s):  
Outcome Measures ◽  
Repeated Measures ◽  
Vertical Jump ◽  
Plantar Flexion ◽  
Jump Height ◽  
Vertical Jump Height ◽  
Run Time ◽  
Joint Range ◽  
Shuttle Run ◽  
Ankle Bracing

Context:Ankle bracing has been used for many years in an attempt to prevent lateral ligamentous injuries of the ankle by restricting joint range of motion (ROM).Objective:To examine the influence of ankle bracing on ROM and sport-related performance.Design:Repeated measures.Setting:Biomechanics laboratory.Participants:30 volunteers. None reported ankle trauma within 2 years preceding the study or had other orthopedic conditions that would have affected physical performance.Intervention:Three brace conditions (McDavid A101™, Perform-8™ Lateral Stabilizer) were assessed during performance of the vertical jump and shuttle run.Main Outcome Measures:shuttle-run time, vertical jump height, inversion, and plantar flexion ROM.Results:Both braces restricted plantar flexion and inversion ROM and caused no change in shuttle-run time or vertical jump height.Conclusions:Our results indicate that bracing the ankle joint increases external lateral support to the joint without significantly restricting functional ability.

Ankle Bracing Decreases Vertical Jump Height and Alters Lower Extremity Kinematics

2016 ◽  
Vol 21 (2) ◽  
pp. 39-46 ◽  
Author(s):  
Bradley Smith ◽  
Tina Claiborne ◽  
Victor Liberi
Keyword(s):  
Lower Extremity ◽  
Vertical Jump ◽  
Plantar Flexion ◽  
Emg Activity ◽  
Jump Height ◽  
Jump Performance ◽  
Vertical Jump Height ◽  
Hip Flexion ◽  
Ankle Plantar Flexion ◽  
Ankle Bracing

The purpose of this study was to determine the effects of ankle bracing on vertical jump performance and lower extremity kinematics and electromyography (EMG) activity. Twenty healthy college athletes participated in two sessions, separated by a minimum of 24 hr. They performed five jumps with no brace on the first day, and five jumps with both ankles braced on the second day. An average of the three highest jumps each day was used for analysis. Braced vertical jump performance significantly decreased (p = .002) as compared with the unbraced condition. In addition, hip flexion (p = .043) and ankle plantar flexion (p = .001) angles were significantly smaller during the braced vertical jump. There was also a significant reduction in soleus muscle EMG (p = .002) during the braced condition.

scholarly journals The Effects of Successive Soccer Matches on the Internal Match Load, Stress Tolerance, Salivary Cortisol and Jumping Performance in Youth Soccer Players

2021 ◽  
Vol 80 (1) ◽  
pp. 173-184
Author(s):  
Julio Cesar Barbosa de Lima Pinto ◽  
Romerito Sóstenes Canuto de Oliveira ◽  
Nicole Leite Galvão-Coelho ◽  
Raissa Nóbrega de Almeida ◽  
Alexandre Moreira ◽  
...  
Keyword(s):  
Stress Tolerance ◽  
Salivary Cortisol ◽  
Repeated Measures ◽  
Vertical Jump ◽  
Soccer Players ◽  
Enzyme Linked Immunosorbent Assay ◽  
Jump Height ◽  
Youth Soccer ◽  
Jumping Performance ◽  
Vertical Jump Height

Abstract The study aim was to analyze the effects of successive matches on the internal match load, stress tolerance, salivary cortisol concentration and countermovement vertical jump height in twelve youth soccer players (16.6 ± 0.5 yr; 175 ± 8 cm; 65 ± 8 kg) who performed four official matches within a four day-period with a 24-h recovery interval between the matches. The internal match load, monotony index and competitive strain, as well as stress tolerance were examined. Saliva samples were collected and countermovement vertical jump height was assessed 60 min pre and 30 min post each match; delta of salivary cortisol and countermovement vertical jump height for each match were analyzed. Salivary cortisol was analyzed using an enzyme-linked immunosorbent assay. The results of ANOVA with repeated measures showed no differences between matches for the internal match load (p > 0.05). The scores of the monotony index and competitive strain were 4.3 (±2.3) and 8104 (±6795) arbitrary units, respectively. There was no difference for stress tolerance between matches (p > 0.05). Delta values of salivary cortisol were not different among the assessed matches (F(3,33) = 1.397, p = 0.351, η2: 0.09); however, delta of countermovement vertical jump height decreased from match 1 to match 4 (F(3,33) = 8.64, p < 0.001, η2: 0.44). The current findings suggest that participating in four successive matches, with 24-h of recovery in between, may not lead to changes in stress tolerance and salivary cortisol of youth players, but it may induce a decrease in players’ jumping performance after the fourth match.

scholarly journals Physical Performance Improves With Time and a Functional Knee Brace in Athletes After ACL Reconstruction

2020 ◽  
Vol 8 (8) ◽  
pp. 232596712094425
Author(s):  
Laura C. Dickerson ◽  
Alexander T. Peebles ◽  
Joseph T. Moskal ◽  
Thomas K. Miller ◽  
Robin M. Queen
Keyword(s):  
Physical Performance ◽  
Performance Measures ◽  
Repeated Measures ◽  
Vertical Jump ◽  
Performance Testing ◽  
Performance Measure ◽  
Jump Height ◽  
Knee Brace ◽  
Vertical Jump Height ◽  
The Impact

Background: Athletes who return to sport (RTS) after anterior cruciate ligament reconstruction (ACLR) often have reduced physical performance and a high reinjury rate. Additionally, it is currently unclear how physical performance measures can change during the RTS transition and with the use of a functional knee brace. Purpose/Hypothesis: The purpose of this study was to examine the effects of time since surgery (at RTS and 3 months after RTS) and of wearing a brace on physical performance in patients who have undergone ACLR. We hypothesized that physical performance measures would improve with time and would not be affected by brace condition. Study Design: Controlled laboratory study. Methods: A total of 28 patients who underwent ACLR (9 males, 19 females) completed physical performance testing both after being released for RTS and 3 months later. Physical performance tests included the modified agility t test (MAT) and vertical jump height, which were completed with and without a knee brace. A repeated-measures analysis of variance determined the effect of time and bracing on performance measures. Results: The impact of the knee brace was different at the 2 time points for the MAT side shuffle ( P = .047). Wearing a functional knee brace did not affect any other physical performance measure. MAT times improved for total time ( P < .001) and backpedal ( P < .001), and vertical jump height increased ( P = .002) in the 3 months after RTS. Conclusion: The present study showed that physical performance measures of agility and vertical jump height improved in the first 3 months after RTS. This study also showed that wearing a knee brace did not hinder physical performance. Clinical Relevance: Wearing a functional knee brace does not affect physical performance, and therefore a brace could be worn during the RTS transition without concern. Additionally, physical performance measures may still improve 3 months past traditional RTS, therefore justifying delayed RTS.

Compensatory Mechanisms in Basketball Players with Jumper’s Knee

2008 ◽  
Vol 17 (4) ◽  
pp. 358-371 ◽  
Author(s):  
Julie A. Siegmund ◽  
Kellie C. Huxel ◽  
C. Buz Swanik
Keyword(s):  
Lower Extremity ◽  
Repeated Measures ◽  
Vertical Jump ◽  
Healthy Controls ◽  
Jump Height ◽  
Jumper’S Knee ◽  
Basketball Players ◽  
Significant Group ◽  
Vertical Jump Height ◽  
Type Design

Context:Determining whether there are compensations in those with jumper’s knee (JK) might further our understanding of the condition.Objective:Comparing lower extremity kinematics and jump performance of basketball athletes with JK with those of healthy controls (C).Design:Repeated-measures control-match design.Setting:University laboratory.Participants:24 male basketball players (12 JK, 12 C) matched by height, weight, position, experience, and frequency of play.Interventions:Standing countermovement and running layup jumps.Main Outcome Measures:Maximum vertical-jump height, footfall landing, and lower extremity sagittal-plane kinematics.Results:There were no significant group differences (P > .05) in vertical-jump height (JK = 64.3 ± 8.6 cm, C = 63.0 ± 9.8 cm) or layup height (JK = 71.3 ± 11.6 cm, C = 73.3 ± 11.0 cm). JK subjects landed flat footed (50%) more than controls (8%). JK subjects showed significantly more hip flexion (JK = 105° ± 24.8°, C = 89.8° ± 14.1°; P = .039) with decreased hip acceleration during the countermovement (JK = −3039 ± 1392°/s2, C = −4229 ± 1765°/s2; P = .040). When landing from the countermovement jump, JK subjects had significantly less knee acceleration (JK = −4960 ± 1512°/s2, C = −6736 ± 2009°/s2; P = 023) and in the layup showed significantly less ankle dorsiflexion (JK = 106.5° ± 9.0°, C = 112.5° ± 7.7°; P = .048) and hip acceleration (JK = − 2841 ± 1094°/s2, C = −3912 ± 1575°/s2; P = .033).Conclusion:Compensatory strategies observed in JK subjects might help maintain performance, because their jump height was similar to that of healthy controls.

Physical and performance characteristics related to starter status, position, and division in Japanese collegiate American-football players

2021 ◽  
pp. 1-8
Author(s):  
Junta Iguchi ◽  
Minoru Matsunami ◽  
Tatsuya Hojo ◽  
Yoshihiko Fujisawa ◽  
Kenji Kuzuhara ◽  
...  
Keyword(s):  
Performance Test ◽  
Vertical Jump ◽  
American Football ◽  
Football Players ◽  
Jump Height ◽  
Test Results ◽  
Repetition Maximum ◽  
Vertical Jump Height ◽  
Division 1 ◽  
And Performance

BACKGROUND: Few studies have investigated the variations in body composition and performance in Japanese collegiate American-football players. OBJECTIVE: To clarify what characterizes competitors at the highest levels – in the top division or on the starting lineup – we compared players’ body compositions and performance test results. METHODS: This study included 172 players. Each player’s body composition and performance (one-repetition maximum bench press, one-repetition maximum back squat, and vertical jump height) were measured; power was estimated from vertical jump height and body weight. Players were compared according to status (starter vs. non-starter), position (skill vs. linemen), and division (1 vs. 2). Regression analysis was performed to determine characteristics for being a starter. RESULTS: Players in higher divisions and who were starters were stronger and had more power, greater body size, and better performance test results. Players in skill positions were relatively stronger than those in linemen positions. Vertical jump height was a significant predictor of being a starter in Division 1. CONCLUSION: Power and vertical jump may be a deciding factor for playing as a starter or in a higher division.

Effects of plyometric jump training in female soccer player’s vertical jump height: A systematic review with meta-analysis

2020 ◽  
Vol 38 (13) ◽  
pp. 1475-1487 ◽  
Author(s):  
Rodrigo Ramirez-Campillo ◽  
Javier Sanchez-Sanchez ◽  
Blanca Romero-Moraleda ◽  
Javier Yanci ◽  
Antonio García-Hermoso ◽  
...  
Keyword(s):  
Systematic Review ◽  
Meta Analysis ◽  
Vertical Jump ◽  
Jump Height ◽  
Jump Training ◽  
Vertical Jump Height

Lower-Extremity Biomechanics and Maintenance of Vertical-Jump Height During Prolonged Intermittent Exercise

2014 ◽  
Vol 23 (4) ◽  
pp. 319-329
Author(s):  
Randy J. Schmitz ◽  
John C. Cone ◽  
Timothy J. Copple ◽  
Robert A. Henson ◽  
Sandra J. Shultz
Keyword(s):  
Lower Extremity ◽  
Outcome Measures ◽  
Principal Components ◽  
Intermittent Exercise ◽  
Vertical Jump ◽  
The Body ◽  
Rating Of Perceived Exertion ◽  
Jump Height ◽  
Lower Extremity Biomechanics ◽  
Biomechanical Factors

Context:Potential biomechanical compensations allowing for maintenance of maximal explosive performance during prolonged intermittent exercise, with respect to the corresponding rise in injury rates during the later stages of exercise or competition, are relatively unknown.Objective:To identify lower-extremity countermovement-jump (CMJ) biomechanical factors using a principal-components approach and then examine how these factors changed during a 90-min intermittent-exercise protocol (IEP) while maintaining maximal jump height.Design:Mixed-model design.Setting:Laboratory.Participants:Fifty-nine intermittent-sport athletes (30 male, 29 female) participated in experimental and control conditions.Interventions:Before and after a dynamic warm-up and every 15 min during the 1st and 2nd halves of an individually prescribed 90-min IEP, participants were assessed on rating of perceived exertion, sprint/cut speed, and 3-dimensional CMJ biomechanics (experimental). On a separate day, the same measures were obtained every 15 min during 90 min of quiet rest (control).Main Outcome Measures:Univariate piecewise growth models analyzed progressive changes in CMJ performance and biomechanical factors extracted from a principal-components analysis of the individual biomechanical dependent variables.Results:While CMJ height was maintained during the 1st and 2nd halves, the body descended less and knee kinetic and energetic magnitudes decreased as the IEP progressed.Conclusions:The results indicate that vertical-jump performance is maintained along with progressive biomechanical changes commonly associated with decreased performance. A better understanding of lower-extremity biomechanics during explosive actions in response to IEP allows us to further develop and individualize performance training programs.

scholarly journals Vertical jump fatigue does not affect intersegmental coordination and segmental contribution

2014 ◽  
Vol 20 (3) ◽  
pp. 303-309 ◽  
Author(s):  
Gleber Pereira ◽  
Paulo B. de Freitas ◽  
Jose A. Barela ◽  
Carlos Ugrinowitsch ◽  
André L. F. Rodacki ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Coordination Pattern ◽  
Jump Height ◽  
Movement Duration ◽  
Intersegmental Coordination ◽  
Vertical Jump Height ◽  
Movement Synergy ◽  
Vertical Jumps

The aim of this study was to describe the intersegmental coordination and segmental contribution during intermittent vertical jumps performed until fatigue. Seven male visited the laboratory on two occasions: 1) the maximum vertical jump height was determined followed by vertical jumps habituation; 2) participants performed intermittent countermovement jumps until fatigue. Kinematic and kinetic variables were recorded. The overall reduction in vertical jump height was 5,5%, while the movement duration increased 10% during the test. The thigh segment angle at movement reversal significantly increased as the exercise progressed. Non-significant effect of fatigue on movement synergy was found for the intersegmental coordination pattern. More than 90% of the intersegmental coordination was explained by one coordination pattern. Thigh rotation contributed the most to the intersegmental coordination pattern, with the trunk second and the shank the least. Therefore, one intersegmental coordination pattern is followed throughout the vertical jumps until fatigue and thigh rotation contributes the most to jump height.

scholarly journals Effects of Kettlebell Swing vs. Explosive Deadlift Training on Strength and Power

2017 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Matthew R. Maulit ◽  
David C. Archer ◽  
Whitney D. Leyva ◽  
Cameron N. Munger ◽  
Megan A. Wong ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Jump Height ◽  
Strength And Conditioning ◽  
Vertical Jump Height ◽  
Jump Power

Background: Recent research has compared explosive deadlift to kettlebell training observing their effects on strength. The kettlebell swing is a popular practical exercise as it shares share a hip hinge movement with the explosive deadlift, but the two have not been compared. Objectives: The purpose of this study was to compare the effects of kettlebell swing vs. explosive deadlift training on strength and power. Methods: Thirty-one recreationally resistance-trained men (age = 23.1 ± 2.3 years, height = 175.5 ± 6.6 cm, mass = 83.9 ± 13.8 kg, 1RM deadlift = 159.9 ± 31.7 kg) were randomly assigned to one of two groups [kettlebell swing group (KBG) n = 15, or explosive deadlift group (EDLG) n = 16]. Vertical jump height, isometric mid-thigh pull (MTP), and 1RM deadlift were measured pre and post training. Both groups trained twice per week for 4 weeks. Volume and load were increased after the first 2 weeks of training. Results: A 2 (time) x 2 (group) mixed factor ANOVA revealed a significant (P<0.05) increase in deadlift 1RM (pre: 159.9 ± 31.7 kg, post: 168.9 ± 31.8 kg) and vertical jump height (pre: 56.6 ± 9.9 cm, post: 57.9 ± 9.7 cm) for both groups, but were not significantly different between groups. There were no significant changes in MTP. Conclusions: Strength and conditioning professionals may use both kettlebell swings and explosive deadlifts to increase deadlift strength and vertical jump power.

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