Acute Enhancement of Lower-Extremity Dynamic Strength and Flexibility with Whole-Body Vibration

ArticleinThe Journal of Strength and Conditioning Research 23(1):51-7 · October 2008with39 Reads
DOI: 10.1519/JSC.0b013e3181839f19 · Source: PubMed
Abstract
The purpose of this investigation was to examine the acute effects of whole-body vibration (WBV) on muscular strength, flexibility, and heart rate (HR). Twenty adults (10 men, 10 women) untrained to WBV participated in the study. All subjects completed assessment of lower-extremity isokinetic torque, flexibility, and HR immediately before and after 6 minutes of WBV and 6 minutes of leg cycling ergometry (CYL), in randomized order. During WBV, subjects stood upright on a vibration platform for a total of 6 minutes. Vibration frequency was gradually increased during the first minute to a frequency of 26 Hz, which was maintained for the remaining 5 minutes. During CYL, power output was gradually increased to 50 W during the first minute and maintained at that power output for the remaining 5 minutes. Lower-extremity flexibility was determined using the sit-and-reach box test. Peak and average isokinetic torque of knee extension and flexion were measured by means of a motor-driven dynamometer with velocity fixed at 120 degrees .s. Change scores for the outcome measures were compared between treatments using Student's paired t-tests. Analysis revealed significantly greater HR acceleration with CYL (24.7 bpm) than after WBV (15.8 bpm). The increase of sit-and-reach scores after WBV (4.7 cm) was statistically greater (p < 0.05) than after CYL (0.8 cm). After WBV, increases in peak and average isokinetic torque of knee extension, 7.7% and 9.6%, were statistically greater than after CYL (p < 0.05). Average torque of knee flexion also increased more with WBV (+7.8%) than with CYL (-1.5%) (p < 0.05). The findings of this study indicate that short-term WBV standing elicits acute enhancements of lower-extremity muscular torque and flexibility, suggesting the application of this technology as a preparatory activity before more intense exercise.
    • "One possible reason for the findings observed in the present study could be that the Another possible explanation is that the subjects might need a longer period of vibration to obtain significant recovery of muscle fatigue. Jacobs and Burns (2009) applied six minutes of WBV and found acute enhancements of lower extremity strength and flexibility. 28 In this study, however, the WBV exposure time of 2 minutes was chosen as this duration has been found to result in the improvement of knee extension strength when compared to 4 and 6 minutes. "
    [Show abstract] [Hide abstract] ABSTRACT: Context: Whole body vibration (WBV) is a type of weight-bearing exercise used in the field of sport and rehabilitation. There is no study on the effects of WBV on muscle recovery after a fatiguing activity. Objective: To determine the effects of a single whole body vibration (WBV) session on lower extremity fatigue. Design: Randomized controlled pilot study. Setting: University Physiotherapy Clinic. Subjects: A total of 13 healthy young men volunteered to participate in this study. Subjects were randomly assigned into the WBV group (n = 7, mean age: 21 years) or control group (CG: n = 6, mean age: 20 years). Intervention: Subjects in the WBV group participated in a single session WBV (30 Hz, amplitude 4 mm, 2 minutes) after lower extremity fatigue. Main outcome measures: Peak force of quadriceps muscle, single leg hop test, and Y-test which were measured before inducing muscle fatigue (T0), immediately after completing the fatigue protocol (T1), after WBV (T2), and 15 minutes following the application of WBV (T3). The same method was applied in the CG while the WBV machine was turned off. Results: Repeated-measures ANOVA revealed no significant differences between groups in any of the outcomes. Conclusions: The findings indicated that the WBV was not effective in the recovery of lower extremity fatigue in healthy young men.
    Article · Jun 2016
    • "In the study, penalty kick performance increased by 5.9 percent after a WBV application. This result conveys similar qualities to the previous results where WBV applications increased the acute performance (Cochrane and Stannard 2005; Cormie et al. 2006; Issurin and Tenenbaum 1999; Jacobs and Burns 2009; McBride et al. 2010; Ronnestad 2009). In their study, Jacobs and Burns (2009) stated that WBV applications increased the knee extension peak and average isokinetic torque in sequence of 7.7 percent and 9.6 percent, and knee flexion average isokinetic torque of 7.8 percent. "
    [Show abstract] [Hide abstract] ABSTRACT: The aim of this study was to compare the acute effects of various preconditioning activities on football penalty kick performance. 21 football players performed four different preconditioning activities in random order on non-consecutive days. The preconditioning activities were composed of only 10 minutes of jogging (OW), 10 minutes of jogging and squats with body weight (SBW), 10 minutes of jogging and elastic band (EB), and 10 minutes of jogging and whole-body vibration (WBV). After the completion of each preconditioning activity, the football penalty kick performance of the subjects was tested. The difference between OW and SBW (5,2%), and EB (4,7%) and WBV (5%) were considered to be meaningful (p<0,01). However, no difference was noted between SBW, EB and WBV (p>0,01). According to the findings, SBW, EB and WBV applications, which were used as preconditioning activities after a low intensity aerobics-based joggings acutely, increase penalty kick performance.
    Full-text · Article · Dec 2015
    • "This increase of muscular strength is comparable to 14-23 % increases in muscular strength that have been reported immediately following joint mobilization of the lower extremity282930. The improvements of muscular strength also compare favorably to increases documented between 5.20 and 9.4 % of lower extremity muscle strength in response to a whole-body vibration stimulus313233. However, the results of the current research project are in direct conflict with previous research documenting 0-11 % decreases in lower extremity muscular strength in response to various forms of massage343536and soft tissue mobilization using devices such as " the Stick " [37] and foam rollers [36, 37]. "
    [Show abstract] [Hide abstract] ABSTRACT: Background Astym ® therapy is a manual therapy intervention used to stimulate tissue healing, decrease pain, improve mobility, and improve muscle performance associated with musculoskeletal pathology. The purpose of this study was to determine if Astym therapy administered to the lower extremity would result in an immediate change of maximal force output during a unilateral isometric squat test among individuals with a lower extremity injury. Methods Forty-five subjects (14 males; 31females) between 18 and 65 years of age were randomized into 3 treatment groups: 1) Control group – received no treatment 2) Placebo group – received a sham Astym treatment 3) Astym therapy group– received Astym therapy to the lower extremity. A baseline measure of maximal force output (pre-test) during a unilateral isometric squat was performed. The subjects then received the designated treatment intervention. Immediately following the treatment intervention, maximal force output (post-test) was retested using identical testing procedures by an investigator who was blinded to the treatment intervention received by the subjects. The percent change of maximal force output from pre-test to post-test measures was compared using a one-way analysis of variance. A Tukey’s post-hoc analysis determined the statistical differences between the groups. Results The treatment intervention had a significant effect on the percent change of maximal force output [F(2,42) = 7.91, p = 0.001]. Tukey’s post hoc analysis demonstrated that the percent change of maximal force output was significantly greater in the Astym group (15 ± 18 % change of Newtons) compared to the placebo (−6 ± 11 % change of Newtons; p = 0.0001) and control (−1 ± 17 % change of Newtons; p = 0.0014) groups. No significant difference (p = 0.68) was noted between the control and placebo groups. Conclusions Astym therapy to the involved lower extremity increased maximum force output during an isometric squat test immediately following treatment. The results of this study suggest that Astym therapy can immediately improve muscle performance (maximal force output) for patients presenting with muscular weakness caused by a lower extremity musculoskeletal injury.
    Full-text · Article · Oct 2015
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