East Tennessee State University, Johnson City, TN

Slides:



Advertisements
Similar presentations
THANK YOU Dr. Bo Fernhall Dr. Bo Fernhall Dr. David Pendergast Dr. David Pendergast Thomas Rowland M.D. Thomas Rowland M.D. Dr. Vish Unnithan Dr. Vish.
Advertisements

Strength Increase after Whole Body Vibration Compared with Resistance training. Christophe Delecluse, Sabine Verschueren, Machteld Roelants Faculteit Lichamelijke.
Summary And Conclusions
Training-Induced Changes in Neural Function Per Aagaard Exer Sport Sci Rev: 31(2) 2003,
Electrophysiologic Measures of Ulnar Sensory Nerve Function: Electrophysiologic Measures of Ulnar Sensory Nerve Function: Reference Values and Reliability.
Subjects Forty-two law enforcement officers from central Kentucky participated in this testing as part of a larger fitness study. 34 Males Age = 35.8 ±
Neuromuscular Adaptations During the Acquisition of Muscle Strength, Power and Motor Tasks Toshio Moritani.
Abstract Background Results Olivia Augustin, Lyddia Petrofsky, Kathryn Lyman, & Brittany Weiler Faculty Advisor: Dr. Don Bredle Department of Kinesiology,
By: Sadie Whaley Advisor: Jeff Vossen Co-Advisor: Angie Kolen October 30 th, 2013.
Giggins OM, Coughlan GF, Caulfield BM, Crowe LM Stim XDP Research Group, Institute for Sport and Health, University College Dublin, Dublin 4, Ireland.
CHANGES IN VERTICAL JUMP HEIGHT ACROSS EIGHT DAYS IN COUNTERMOVEMENT JUMPS PERFORMED BY NOVICE JUMPERS Michael E. Feltner, FACSM, Priscilla G. MacRae,
Controversies in Strength Training Guidelines and Recommendations Robert A. Robergs, Ph.D., FASEP, EPC Exercise Physiology Laboratories, Exercise Science.
Introduction Methods Results Conclusion  Strong abdominal muscles are thought to be important in maintaining a healthy spine. However, exercises geared.
A Study of an Accelerometer to Increase Energy Expenditure in Sedentary Individuals Anne Kapping, Darrel Swanson, A.J. Algiers, Jessica Ransom, and Gary.
Training for Performance Training Principles Overload –Increased capacity in response to training overload Specificity –Specific muscle involved –Energy.
Effect of Coffee on Caloric Expenditure in College-Aged Adults during Moderate Exercise Nicole Gutzman, Maggie Meitzen, Tiffany Moy, and Casey Wick Faculty.
Results (cont’d). AbstractMethods (cont’d) Purpose Conclusions Authors here: Allison Jack Biomechanics Research Laboratory, The University of Texas at.
The effects of creatine supplementation and three days of isokinetic training on muscle strength, power output, and neuromuscular function Julie Culbertson.
T tests comparing two means t tests comparing two means.
Weight training with the Galileo2000 in youth top-volleyball Thesis University Berlin, Elmar Harbrecht (translated summary by Martin Huizing) After a 1.
Results (cont’d) Results. Abstract Introduction Methods (cont’d) Purpose Conclusions Author: Dominic Igbaji Ugar Faculty Sponsor: J.R. Wilson, Dept. of.
Track & Field: Warm-up, Stretching, & Flexibility
TEMPLATE DESIGN © ABSTRACTRESULTSRESULTS (CONT.) METHODS INTRODUCTION PURPOSE RESULTS CONT. SUMMARY & CONCLUSIONS Muscle.
Marian Abowd, Dr. Cindy Trowbridge, Dr. Mark Ricard EFFECTS OF PATTERNED ELECTRICAL NEUROMUSCULAR STIMULATION ON KNEE JOINT STABILIZATION AbstractResultsConclusion.
Ki Hyuk Sung, MD Relationship between isometric muscle strength, gait parameters, and gross motor function Seoul National University Bundang Hospital.
Effects of creatine supplementation on multiple 40m sprint performance ABSTRACT Purpose: To examine the effects of creatine supplementation on.
Results (continued) Results Abstract Methods The motor imagery group was read a detailed script and in summary asked to do the following during rest intervals:
One-arm reach (heels down example) Two-arm reach (heels up example) Conclusions Highest reliability for all age groups was in the toe-to-finger method.
ABSTRACT The purpose of the present study was to investigate the test-retest reliability of force-time derived parameters of an explosive push up. Seven.
Can physiological indices of fitness predict competitive national rank in high performance junior British surfers? Barlow, M.J. 1 ; Findlay, M. 1 ; Gresty,
ABSTRACT INTRODUCTION Mental Fatigue and the Effects on Anaerobic Power Output J. Zepernick 1, N. VanDomelen 1, K. De Jong 1, C. Nilson 1, K. Long 1, E.
Conclusion Subjects Recreationally- trained males (n=26) 3 groups: power training (n=10); strength-power training (n=8); control (n=8) Training Program.
Stats Methods at IC Lecture 3: Regression.
A Novel Equation to Predict Peak Power in Young Athletes
Association of Body Mass Index (BMI) and Depression Severity
THE USE OF FATIGUE AND POWER AS EARLY INDICATORS OF OVERTRAINING IN FEMALE RUNNERS Justin Nicoll1, Disa L. Hatfield1, Ryan Keith1, Kathleen Melanson2,
W. Hoffstetter, A. Box, H. Mimms, P. Serafini, M. Smith, B. M
Standard Level Diploma
Anaerobic Power Output and Blood Lactate in Wheelchair Rugby Athletes Laurie A. Malone1, Ildiko Nyikos1, J. P. Barfield2 1Lakeshore Foundation, Birmingham,
1. THE INFLUENCE OF MATURATION ON SEASONAL CHANGES IN STRENGTH, SPEED AND POWER IN YOUTH SOCCER PLAYERS  R. Morris1, S. Emmonds1, B. Jones1, G, Roe1, J.
Chapter 21 Training for Performance
AND BENDING STRENGTH IN YOUNG ADULTS
Heavy and Light Training Days Attenuates Decline in Force Output During 3-Weeks High-Volume Resistance Training Kevin M. Carroll1, Jake R. Bernards1,
Does Long Term Swimming Participation Lead to Reduced BMD
Relationship between Isometric Force Characteristics and Hitting Performance in NCAA Division 1 Baseball Players W. G. Hornsby III, C. A. Bailey, C. Y.
ELECTROMYOGRAPHIC ACTIVITY OF THE CORE MUSCULATURE DURING
Comparison between the Effect of Six Weeks Morning or Evening Aerobic Exercise on Appetite and Anthropometric Indices Zahra Alizadeh, MD Assistant Professor.
The University of Alabama, Tuscaloosa, AL
Conclusions & Implications
Day-to-day variability in older adults' physical activity:
Does raising morning rectal temperature to
Geoffrey A. Power, Brian H. Dalton, Charles L
Acute Responses of KB-Specific Workouts (Mean ± SD)
John Bateman, The Influence of Positional Biomechanics on Gross Efficiency within Cycling John Bateman,
Effect of Short-Term Plyometric Training on Speed, Strength and Power.
Effects of Whole Body Heating During Warm-up on Strength, Power, and Flexibility Trevor Krzyzanowski, Caleb Ross, Daniel Newmire, Dustin Slivka University.
East Tennessee State University, Johnson City, TN
A SYSTEMATIC REVIEW AND META ANALYSIS
Number of Days of Monitoring Needed with Accelerometers and Pedometers to Obtain Reliable Estimates of Habitual Physical Activity in Adults T. S. Robinson,
To compare the economy of elite and non-elite men and women runners.
ELECTROMYOGRAPHICAL COMPRESSION SHORTS TO PREDICT LACTATE THRESHOLD
John R. Harry • Leland A. Barker • John A. Mercer • Janet S. Dufek
The University of Alabama, Tuscaloosa, AL
Practical Applications:
Test-retest Reliability of Jump Execution Variables using Mechanography: A Comparison of Jump Protocols Jesse A. Stein1, LuAnn Johnson3, James N. Roemmich3,
PSY 325 TUTOR Lessons in Excellence -- psy325tutor.com.
Funding and Acknowledgements
Comparing the Effects of Two Different Strength Training Modes on 1 Rep Max Justin McCullick.
COMPARING VARIABLES OF ORDINAL OR DICHOTOMOUS SCALES: SPEARMAN RANK- ORDER, POINT-BISERIAL, AND BISERIAL CORRELATIONS.
Potter J. A. , Perkins I. C. , Hodgson, C. I. , Broadhurst M
Presentation transcript:

East Tennessee State University, Johnson City, TN The Acute Effects of Whole Body Vibration on Isometric Mid-Thigh Pull Performance G. Hornsby, M. South, A. Kavanaugh, A. Layne, G. G. Haff, W. A. Sands, M. Cardinale, M.W. Ramsey, and M.H. Stone Center of Excellence for Sport Science and Coach Education, Sports Science Laboratory, East Tennessee State University, Johnson City, TN Summary & Conclusions Introduction Figure 3: Testing Protocol Standardized Warm-up 3 minute rest period Treatment Condition 1 Treatment Condition 2 Treatment Condition 3 Sham Condition No Vibration 3 x 30 s bouts of 30 Hz Vibration at 2-4 mm amplitude Maximal Isometric Mid-Thigh Test Pull 1 Maximal Isometric Mid-Thigh Test Pull 2 1 minute rest period Warm-up Isometric Mid-Thigh Pull performed at 50% maximum Warm-up Isometric Mid-Thigh Pull performed at 75% maximum Based upon the current research the application of a 30 Hz 2-4 mm amplitude vibration does not result in any statistically significant alterations in isometric mid-thigh pull performance. Even though there are no significant differences in the outcome measures used in this study, it is still possible that the changes in performance noted by the coefficient of variance and the 95% confidence intervals suggest that there is a possible positive effect of WBV. This finding is somewhat in line with research that suggests the application of WBV can be used as a warm-up protocol for jumping activities. However, the positive benefits that may occur in response to a WBV protocol are likely related to the training status of the athlete and the activity which is performed after the warm-up protocol. More research is needed in order to determine the optimal application of WBV in field based settings. Acute exposure to vibration has been suggested to produce transient increases in muscular strength (1,2,8), vertical jump displacement (4,8), and power output (2,6,7) recorded while performing various tasks. It has been hypothesized that the reported acute vibration induced increases in performance occur as a result of alterations in neuromuscular stimulation (1,3,4). Specifically, most studies have ascribed the observed improvements to the likeliness of Whole Body Vibration (WBV) in producing a “tonic vibration reflex” (TVR) in which the primary nerve endings of the Ia afferents of the muscle spindle are activated. This is thought to result in the excitation of the alpha-motor neurons and activation of the extrafusal fibers (4) which likely leads to a greater synchronization of motor units as a result of homonymous motor unit contraction. However, not all investigations report improvements in muscular strength (4), vertical jump (7), and power production in response to acute vibration (4). While the current body of scientific knowledge offers conflicting evidence on the effectiveness of WBV in augmenting neuromuscular performance it is possible that WBV may result in alterations to specific aspects of the force-time curve during the performance of a maximal isometric contraction. Therefore, the primary purpose of this investigation was to examine the effects of WBV performed using 30 Hz frequency and 2-4 mm amplitude on the force-time curves of an isometric mid-thigh pull. Future Research Results There were no statistically significant differences between any of the treatment groups for force-time curve parameters analyzed in the present investigation. There were no significant differences (p ≤ 0.05) for the percent differences between the sham and vibration conditions for any of the force time curve variables analyzed in the present investigation. The results of the coefficient of variance, intraclass correlation, and interclass correlation analyses performed between the sham and vibration treatments (T1 vs. T2; T1 vs. T3) are presented in Table 2. The percent difference scores between the T1 vs. T2 and T1 vs. T3 are presented in Figures 4 and 5. There were only trivial to small correlations between body mass and the percent difference in potentiation for peak force at 50 ms (T1 vs. T2: r= -0.29; T1 vs. T3: r = 0.29), 90 ms (T1 vs. T2: r = -0.46; T1 vs. T3: r = 0.02), 200 ms (T1 vs. T2: r = -0.39; T1 vs. T3: r = -0.08), and 250 ms (T1 vs. T2: r = -0.48; T1 vs. T3: r = -0.11). Similar results were found when looking at the RFD results at 50 ms (T1 vs. T2: r= -0.33; T1 vs. T3: r = -0.23), 90 ms (T1 vs. T2: r = -0.36; T1 vs. T3: r = -0.40), 200 ms (T1 vs. T2: r = -0.04; T1 vs. T3: r = 0.14), and 250 ms (T1 vs. T2: r = -0.36; T1 vs. T3: r = -0.36). While there were no statistically significant increases in the variables measured in the present study, it is possible that there is still a positive effect in response to the vibration protocol. Hopkins et al. (5) suggest that an absolute increase of 10% should be considered as the minimum worthwhile increase in a treatment-induced alteration. Additionally, a coefficient of variance of 0.3-0.6% appears to be an important change for elite athletes. For example, increasing the coefficient of variance by 0.6% increases the chance of winning a competitive event by ≈9-19% . Therefore, based upon the changes in the coefficient of variance noted in this study, it is possible that the application of a WBV protocol may have a meaningful result when applied to an athletic population. In the present study the application of a WBV protocol resulted in increases in the coefficients of variance when compared to the sham protocol on the magnitude of 3.9-60.6% depending upon the variable analyzed (Table 2). With such high coefficients of variance it is likely that there is some acute ergogenic benefit of the WBV protocol, but more research, especially with high level athletes, and possibly with larger sample sizes is warranted to further investigate this hypothesis. Methods Subjects: Eleven (4 women and 7 men) recreationally trained individuals served as subjects in the present investigation which was approved by the East Tennessee State University Institutional Review Board (IRB). All subjects read and signed informed consent documents in accordance with the East Tennessee State IRB. The first testing session was used to perform all preliminary testing. This testing included the collection of the subject’s physical characteristics. A summary of the subject characteristics is presented in Table 1. Additionally during this session each subject was familiarized with the WBV protocol (Figure 1) and the isometric mid-thigh pull testing procedures (Figure 2). Seven days after the completion of the familiarization session and 48 hours after their last exercise bout, the subjects performed one of the three randomly assigned treatment conditions. A summary of the testing protocol is presented in Figure 3. Results Table 2: Coefficient of Variance, Intraclass Correlations, and Interclass Correlations between Treatment Conditions T1 vs T2 T1 vs T3 Variable CV % 95% CI ICC R CV% Peak Force @ 50 ms 11.7 8.0-21.4 0.93 0.75-0.98 0.92 0.71-0.98 7.4 5.1-13.3 0.97 0.90-0.99 0.89-0.99 Peak Force @ 90 ms 14.5 9.9-26.8 0.73-0.98 0.91 0.68-0.98 8.0 5.5-14.5 0.98 0.91-0.99 Peak Force @ 200 ms 10.8 7.5-19.8 0.77-0.98 3.9 2.7-7.0 0.99 0.97-1.00 0.96-1.00 Peak Force @ 250 ms 8.9 6.1-16.1 0.96 0.85-0.99 0.95 0.82-0.99 3.8 2.6-6.8 Maximal Peak Force 4.2 2.9-7.5 5.9 4.1-10.7 0.93-0.99 PRFD @ 0-50 ms 60.6 41.9-112.6 0.76 0.43-0.91 0.74 0.35-0.91 40.1 28.3-71.1 0.88 0.69-0.96 0.87 0.64-0.96 PRFD @ 0-90 ms 33.5 23.8-58.5 0.89 0.70-0.96 0.65-0.96 23.5 16.9-39.9 0.82-0.98 0.94 0.81-0.98 PRFD @ 0-200 ms 34.6 23.1-68.5 0.72 0.25-0.92 0.70 0.17-0.92 30.8 20.6-60.2 0.78 0.37-0.94 0.30-0.93 PRFD @ 0-250 ms 15.3 11.1-25.4 0.78-0.97 0.75-0.97 7.9 5.8-12.8 0.94-0.99 Acknowledgements The authors would like to thank, Kate Powell, Dawn Thomas and Zach Ensor for their assistance in data collection and PowerPlate Inc. for partially funding the present project. Table 1: Subject Physical Characteristics (n = 11). Males (n = 7) Females (n = 4) Combined (n = 11) Mean  SD Age (y) 24.7 1.8 23.5 1.0 24.3 1.6 Height (cm) 179.2 6.2 164.8 6.8 173.9 9.5 Weight (kg) 101.7 12.9 65.3 5.2 88.4 21.1 References Note: CV = coefficient of variance; 95% CI = the 95% confidence interval; T1 = mid-thigh pull sham treatment; T2 = mid-thigh pull vibration treatment 1; T3 = mid-thigh pull vibration treatment 2. Bosco C, Cardinale M, Tsarpela O. Influence of vibration on mechanical power and electromyogram activity in human arm flexor muscles. Eur J Appl Physiol Occup Physiol 1999;79:306-311. Bosco C, Colli R, Introini E, et al. Adaptive responses of human skeletal muscle to vibration exposure. Clin Physiol 1999;19:183-187. Cardinale M, Bosco C. The use of vibration as an exercise intervention. Exerc Sport Sci Rev 2003;31:3-7. Cormie P, Deane RS, Triplett NT, et al. Acute effects of whole-body vibration on muscle activity, strength, and power. J Strength Cond Res 2006;20:257-261. Hopkins WG, Hawley JA, Burke LM. Design and analysis of research on sport performance enhancement. Med Sci Sports Exerc 1999;31:472-485. Issurin VB, Tenenbaum G. Acute and residual effects of vibratory stimulation on explosive strength in elite and amateur athletes. J Sports Sci 1999;17:177-182. Ronnestad BR. Acute effects of various whole-body vibration frequencies on lower-body power in trained and untrained subjects. J Strength Cond Res 2009;23:1309-1315. Torvinen S, Kannu P, Sievanen H, et al. Effect of a vibration exposure on muscular performance and body balance. Randomized cross-over study. Clin Physiol Funct Imaging 2002;22:145-152. Figure 4: Percent Change for Peak Force between Sham and Vibration Treatments Figure 5: Percent Change for Peak Rate of Force Development between Sham and Vibration Treatments. Figure 1: Standing on vibration platform Figure 2: Isometric Mid-Thigh Pull