TY - JOUR AU - Liu, Yuxiu AU - Fan, Yongzhao AU - Chen, Xiaohong TI - Effects of Whole-Body Vibration Training with Different Body Positions and Amplitudes on Lower Limb Muscle Activity in Middle-Aged and Older Women JF - DOSE-RESPONSE J2 - DOSE RESP VL - 20 PY - 2022 IS - 3 PG - 9 SN - 1559-3258 DO - 10.1177/15593258221112960 UR - https://m2.mtmt.hu/api/publication/33217409 ID - 33217409 AB - Purpose The present study was designed to investigate the electromyographic (EMG) response in leg muscles to whole-body vibration while using different body positions and vibration amplitudes. Methods: An experimental study with repeated measures design involved a group of community-dwelling middle-aged and older women (n = 15; mean age=60.8 +/- 4.18 years). Muscle activity of the gluteus maximus (GM), rectus femoris (RF), vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF), and gastrocnemius (GS) was measured by surface electromyography, which participants were performing three different body positions during three WBV amplitudes. The body positions included static semi-squat, static semi-squat with elastic band loading, and dynamic semi-squat. Vibration stimuli tested were 0 mm, 2 mm, and 4 mm amplitude and 30 Hz frequencies. And the maximum accelerations produced by vibration stimuli with amplitudes of 2 mm and 4 mm are approximately 1.83 g and 3.17 g. Results: Significantly greater muscle activity was recorded in VL, BF, and GS. When WBV was applied to training, compared with the same training without WBV (P < .05). There were significant main effects of body positions on EMGrms for the GM, RF, and VM (P < .05). Compared to static semi-squat, static semi-squat with elastic band significantly increased the EMGrms of GM, and dynamic semi-squat significantly increased the EMGrms of GM, RF and VM (P < .05). And there were significant main effects of amplitudes on EMGrms for the GM, RF, and VM (P < .05). The EMGrms of the VL, BF, and GS at 4 mm were significantly higher than 0 mm, and the EMGrms of the VL and BF at 4 mm were significantly higher than 2 mm. There was no significant body interaction between body positions and amplitudes (P > .05). Conclusions: The EMG amplitudes of most leg muscles tested were significantly greater during WBV exposure than in the no-WBV condition. The dynamic semi-squat 4 mm whole-body vibration training is recommended for middle-aged and older women to improve lower limb muscle strength and function. LA - English DB - MTMT ER - TY - JOUR AU - Rigoni, Isotta AU - Bonci, Tecla AU - Bifulco, Paolo AU - Fratini, Antonio TI - Characterisation of the transient mechanical response and the electromyographical activation of lower leg muscles in whole body vibration training JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 12 PY - 2022 IS - 1 PG - 10 SN - 2045-2322 DO - 10.1038/s41598-022-10137-8 UR - https://m2.mtmt.hu/api/publication/32990310 ID - 32990310 AB - The aim of this study is to characterise the transient mechanical response and the neuromuscular activation of lower limb muscles in subjects undergoing Whole Body Vibration (WBV) at different frequencies while holding two static postures, with focus on muscles involved in shaping postural responses. Twenty-five participants underwent WBV at 15, 20, 25 and 30 Hz while in hack squat or on fore feet. Surface electromyography and soft tissue accelerations were collected from Gastrocnemius Lateralis (GL), Soleus (SOL) and Tibialis Anterior (TA) muscles. Estimated displacement at muscle bellies revealed a pattern never highlighted before that differed across frequencies and postures (p < 0.001). After stimulation starts, muscle oscillation peaks, drops and further stabilises, suggesting the occurrence of a neuromuscular activation to reduce the vibration-induced oscillation. The oscillation attenuation at the SOL muscle correlated with its increased activation (rho = 0.29, p < 0.001). Furthermore, only specific WBV settings led to a significant increase in muscle contraction: WBV-induced activation of SOL and GL was maximal in fore-feet (p < 0.05) and in response to higher frequencies (30 Hz vs 15 Hz, p < 0.001). The analysis of the mechanical dynamics of lower leg muscles highlights a resonant response to WBVs, that for the SOL correlates to the increased muscle activation. Despite differing across frequencies and postures, this resonant behaviour seems to discourage the use of dynamic exercises on vibrating platforms. As for the most efficient WBV combination, calf muscle response to WBVs is maximised if those muscles are already pre-contracted and the stimulation frequencies are in the 25-30 Hz range. LA - English DB - MTMT ER - TY - JOUR AU - Micke, Florian AU - Weissenfels, Anja AU - Wirtz, Nicolas AU - von Stengel, Simon AU - Doermann, Ulrike AU - Kohl, Matthias AU - Kleinoeder, Heinz AU - Donath, Lars AU - Kemmler, Wolfgang TI - Similar Pain Intensity Reductions and Trunk Strength Improvements Following Whole-Body Electromyostimulation vs. Whole-Body Vibration vs. Conventional Back-Strengthening Training in Chronic Non-specific Low Back Pain Patients: A Three-Armed Randomized Controlled Trial JF - FRONTIERS IN PHYSIOLOGY J2 - FRONT PHYSIOL VL - 12 PY - 2021 PG - 9 SN - 1664-042X DO - 10.3389/fphys.2021.664991 UR - https://m2.mtmt.hu/api/publication/32339776 ID - 32339776 AB - The aim of this multicenter trial was to compare the effects of whole-body electromyostimulation (WB-EMS) and whole-body vibration (WBV) with conventional back-strengthening training (CT) on changes in mean back pain intensity (MPI) and trunk strength in patients suffering from chronic non-specific low back pain (CNLBP). Two-hundred and forty CNLBP patients (40-70 years; 62% female) were randomly assigned to three intervention arms (WB-EMS: n = 80 vs. WBV: n = 80 vs. CT: n = 80). All training intervention programs were performed for 12 weeks in their usual commercial training setting. Before and during the last 4 weeks of the intervention, MPI was recorded using a 4-week pain diary. Additionally, maximal isometric trunk extension and -flexion strength was assessed on the BackCheck (R) machine. A moderate but significant decrease of MPI was observed in all groups (WB-EMS: 29.7 +/- 39.1% (SMD 0.50) vs. WBV: 30.3 +/- 39.3% (SMD 0.57) vs. CT: 30.5 +/- 39.6% (SMD 0.59); p < 0.001). Similar findings were observed for maximal isometric strength parameters with a significant increase in all groups (extension: WB-EMS: 17.1 +/- 25.5% vs. WBV: 16.2 +/- 23.6% vs. CT: 21.6 +/- 27.5%; p < 0.001; flexion: WB-EMS: 13.3 +/- 25.6% vs. WBV: 13.9 +/- 24.0% vs. CT: 13.9 +/- 25.4%; p < 0.001). No significant interaction effects for MPI (p = 0.920) and strength parameters (extension: p = 0.436; flexion: p = 0.937) were observed. WB-EMS, WBV, and CT are comparably effective in improving MPI and trunk strength. However, training volume of WB-EMS was 43 or 62% lower, compared with CT and WBV. LA - English DB - MTMT ER - TY - JOUR AU - Oliveira, Mariana P. AU - Menzel, Hans-Joachim K. AU - Cochrane, Darryl J. AU - Drummond, Marcos D. M. AU - Demicheli, Carlo AU - Lage, Guilherme AU - Couto, Bruno P. TI - Individual Responses to Different Vibration Frequencies Identified by Electromyography and Dynamometry in Different Types of Vibration Application JF - JOURNAL OF STRENGTH AND CONDITIONING RESEARCH J2 - J STRENGTH CONDIT RES VL - 35 PY - 2021 IS - 6 SP - 1748 EP - 1759 PG - 12 SN - 1064-8011 DO - 10.1519/JSC.0000000000002985 UR - https://m2.mtmt.hu/api/publication/32950402 ID - 32950402 AB - Oliveira, MP, Menzel, H-JK, Cochrane, DJ, Drummond, MD, Demicheli, C, Lage, G, and Couto, BP. Individual responses to different vibration frequencies identified by electromyography and dynamometry in different types of vibration application. J Strength Cond Res 35(6): 1748-1759, 2021-The application of mechanical vibration is a common neuromuscular training technique used in sports training programs to generate acute increases in muscle strength. The principal aim of the study was to compare the individual optimal vibration frequency (IOVF) identified by electromyography (EMG) activity and force production in strength training. Twenty well-trained male volunteers (age: 23.8 +/- 3.3 years) performed a familiarization and 2 interventions sessions, which included 5 maximal voluntary contractions (MVCs) of the elbow flexors with a duration of 10 seconds and 5-minute intervals between each MVC. The first MVC was performed without vibration followed by 4 randomized MVCs with application of vibration in the direction of the resultant muscle forces' vector (VDF) or whole-body vibration (WBV) at frequencies of 10, 20, 30, or 40 Hz. The mechanical vibration stimulus was superimposed during the MVC. Individual optimal vibration frequency, as identified by EMG, did not coincide with IOVF identified by force production; low agreement was observed between the vibration frequencies in generating the higher EMG activity, maximal force, and root mean square of force. These findings suggest that the magnitude of the vibratory stimulus response is individualized. Therefore, if the aim is to use acute vibration in conjunction with strength training, a preliminary vibration exposure should be conducted to determine the individualized vibratory stimulus of the subject, so that training effects can be optimized. LA - English DB - MTMT ER - TY - JOUR AU - Di Giminiani, Riccardo AU - Rucci, Nadia AU - Capuano, Lorenzo AU - Ponzetti, Marco AU - Aielli, Federica AU - Tihanyi, József TI - Individualized Whole-Body Vibration: Neuromuscular, Biochemical, Muscle Damage and Inflammatory Acute Responses JF - DOSE-RESPONSE J2 - DOSE RESP VL - 18 PY - 2020 IS - 2 SP - 155932582093126 SN - 1559-3258 DO - 10.1177/1559325820931262 UR - https://m2.mtmt.hu/api/publication/31379137 ID - 31379137 LA - English DB - MTMT ER - TY - JOUR AU - Magoffin, Ryan D. AU - Parcell, Allen C. AU - Hyldahl, Robert D. AU - Fellingham, Gilbert W. AU - Hopkins, J. Tyson AU - Feland, J. Brent TI - Whole-Body Vibration as a Warm-up Before Exercise-Induced Muscle Damage on Symptoms of Delayed-Onset Muscle Soreness in Trained Subjects JF - JOURNAL OF STRENGTH AND CONDITIONING RESEARCH J2 - J STRENGTH CONDIT RES VL - 34 PY - 2020 IS - 4 SP - 1123 EP - 1132 PG - 10 SN - 1064-8011 DO - 10.1519/JSC.0000000000002896 UR - https://m2.mtmt.hu/api/publication/31441514 ID - 31441514 AB - Magoffin, RD, Parcell, AC, Hyldahl, RD, Fellingham, GW, Hopkins, JT, and Feland, JB. Whole-body vibration as a warm-up before exercise-induced muscle damage on symptoms of delayed-onset muscle soreness in trained subjects. J Strength Cond Res 34(4): 1123-1132, 2020-There is no clear scientific evidence that whole-body vibration (WBV) used as a warm-up before performing eccentric exercise mitigates delayed-onset muscle soreness (DOMS) and speeds strength loss recovery. These benefits were observed primarily in nonresistance-trained individuals. The aim of this study was to determine whether WBV could mitigate soreness and expedite strength recovery for resistance-trained individuals when used as a warm-up before eccentric exercise. Thirty resistance-trained males completed 300 maximal eccentric contractions of the quadriceps after warming up with (WBV) or without (CON) WBV. Both CON and WBV experienced significant isometric (26.3 and 30.2%, respectively) and dynamic (50.9 and 46.4%, respectively) strength loss immediately after exercise. Isometric strength was significantly depressed after 24 hours in the CON group (8.2% p < 0.02), but not in the WBV group (5.9% p = 0.7). Isometric strength was no longer significantly depressed after 48 hours in the CON group (6.1% p < 0.07) or the WBV group (4.1% p = 0.20). Dynamic strength was significantly decreased in both the CON and WBV groups at 24 hours (17.7% p < 0.001 and 15.5% p < 0.001, respectively) and 48 hours (17.1% p < 0.01 and 13.6% p < 0.002), but only significant for the CON at 1 week after exercise (8.6% p = 0.05). Pain as measured by a visual analog scale was significant in both groups at 24 and 48 hours after exercise, but WBV experienced significantly less soreness than the CON group after 24 hours (28 vs. 46 mm p < 0.01, respectively) and 48 hours (38 vs. 50 mm p < 0.01). Pain pressure threshold increased significantly in both groups, but there was no difference between groups. These results suggest the use of WBV before eccentric exercise mildly mitigates DOMS in trained individuals. Application of WBV can function as a quick mode of warm-up before resistance training and can decrease pain perception from DOMS. This may be beneficial to athletes undergoing a heavy strength training phase where DOMS is likely. LA - English DB - MTMT ER - TY - JOUR AU - Huang, Meizhen AU - Pang, Marco Y. C. TI - Muscle activity and vibration transmissibility during whole-body vibration in chronic stroke JF - SCANDINAVIAN JOURNAL OF MEDICINE & SCIENCE IN SPORTS J2 - SCAND J MED SCI SPOR VL - 29 PY - 2019 IS - 6 SP - 816 EP - 825 PG - 10 SN - 0905-7188 DO - 10.1111/sms.13408 UR - https://m2.mtmt.hu/api/publication/31072517 ID - 31072517 AB - Purpose This study aimed to investigate the influence of whole-body vibration (WBV) frequency, amplitude, and body posture on lower limb muscle activation among people with chronic stroke, and whether the EMG response to vibration stimulus differed between paretic and non-paretic side. The relationship between muscle activation and WBV transmission was also examined. Method Thirty-two participants with chronic stroke performed three different exercises on the WBV platform with different vibration conditions (frequency: 20 Hz, 30 Hz, 40 Hz; amplitude: 0.8 mm, 1.5 mm), or without vibration. Muscle activity in bilateral vastus medialis (VM), medial hamstrings (MH), tibialis anterior (TA), and medial gastrocnemius (MG) was measured by surface electromyography. Acceleration at the platform and bilateral hips and knees was measured by tri-axial accelerometers. Results Significantly greater muscle activity was observed in the bilateral MG (P < 0.001), TA (P < 0.001), and MH (P < 0.001), but not VM, compared with the same exercises without WBV. WBV with higher amplitude or higher frequency led to greater augmentation of muscle activation (P < 0.05). Body posture significantly affected leg muscle activation (P < 0.001). WBV-induced muscle activation was largely similar between paretic and non-paretic sides, except the TA. Greater WBV-induced leg muscle activation was associated with lower WBV transmissibility measured at the more proximal joints (P < 0.05). Conclusion Adding WBV to exercise significantly increased muscle activation in the MG, TA, and MH on both the paretic and non-paretic sides of chronic stroke survivors, and the increase was dependent on the WBV amplitude, frequency, and body posture. LA - English DB - MTMT ER - TY - JOUR AU - Komiya, Makoto AU - Urabe, Yukio AU - Sasadai, Junpei AU - Fujishita, Hironori AU - Sakai, Shogo AU - Maeda, Noriaki TI - The effects of two different whole-body-vibration frequencies on ankle dorsiflexion angle, vertical jump height, and postural stability after landing JF - ISOKINETICS AND EXERCISE SCIENCE J2 - ISOKINET EXERC SCI VL - 27 PY - 2019 IS - 4 SP - 267 EP - 274 PG - 8 SN - 0959-3020 DO - 10.3233/IES-192167 UR - https://m2.mtmt.hu/api/publication/31072516 ID - 31072516 AB - BACKGROUND: Effects of whole-body-vibration (WBV) training have been claimed to depend on individual characteristics and vibration frequency; however, there have not been any studies focusing on effects of different WBV frequencies on flexibility, jump performance, and dynamic balance ability in the same group.METHODS: Twenty healthy men participants were randomly assigned to three conditions [0 Hz, 25 Hz, 40 Hz] prior to the study. They stood barefoot on the non-dominant leg and performed WBV of 5 sets x 30 seconds. In pre- and post-WBV in each condition, the participants measured ankle dorsiflexion angle; single leg squat jump (SLSJ) height; and dynamic postural stability index (DPSI), anterior-posterior stability index (APSI), medial-lateral stability index (MLSI), and vertical stability index (VSI).RESULTS: Ankle dorsiflexion angle at 25 and 40 Hz and SLSJ height at 25 Hz significantly increased after WBV (p < 0.01). DPSI and APSI at 25 Hz and 40 Hz significantly decreased, except VSI, which was significant only at 25 Hz (p < 0.05).CONCLUSIONS: The acute effects of exposure to WBV on flexibility, jump performance, and dynamic balance ability differ by the selected vibration frequencies. LA - English DB - MTMT ER - TY - JOUR AU - Zaidell, Lisa N. AU - Pollock, Ross D. AU - James, Darren C. AU - Bowtell, Joanna L. AU - Newham, Di J. AU - Sumners, David P. AU - Mileva, Katya N. TI - Lower Body Acceleration and Muscular Responses to Rotational and Vertical Whole-Body Vibration at Different Frequencies and Amplitudes JF - DOSE-RESPONSE J2 - DOSE RESP VL - 17 PY - 2019 IS - 1 PG - 10 SN - 1559-3258 DO - 10.1177/1559325818819946 UR - https://m2.mtmt.hu/api/publication/30559055 ID - 30559055 AB - Aim: The aim of this study was to characterize acceleration transmission and neuromuscular responses to rotational vibration (RV) and vertical vibration (VV) at different frequencies and amplitudes. Methods: Twelve healthy males completed 2 experimental trials (RV vs VV) during which vibration was delivered during either squatting (30 degrees; RV vs VV) or standing (RV only) with 20, 25, and 30 Hz, at 1.5 and 3.0 mm peak-to-peak amplitude. Vibration-induced accelerations were assessed with triaxial accelerometers mounted on the platform and bony landmarks at ankle, knee, and lumbar spine. Results: At all frequency/amplitude combinations, accelerations at the ankle were greater during RV (all P < .03) with the greatest difference observed at 30 Hz, 1.5 mm. Transmission of RV was also influenced by body posture (standing vs squatting, P < .03). Irrespective of vibration type, vibration transmission to all skeletal sites was generally greater at higher amplitudes but not at higher frequencies, especially above the ankle joint. Acceleration at the lumbar spine increased with greater vibration amplitude but not frequency and was highest with RV during standing. Conclusions/Implications: The transmission of vibration during whole-body vibration (WBV) is dependent on intensity and direction of vibration as well as body posture. For targeted mechanical loading at the lumbar spine, RV of higher amplitude and lower frequency vibration while standing is recommended. These results will assist with the prescription of WBV to achieve desired levels of mechanical loading at specific sites in the human body. LA - English DB - MTMT ER - TY - JOUR AU - Hernandez-Vicente, A AU - Santos-Lozano, A AU - Bailon, R AU - Mayolas-Pi, C AU - Marin, P J AU - Garatachea, N TI - 2871. Effects of the type of exercise performed on the vibration delivered during whole-body vibration exercises JF - JOURNAL OF VIBROENGINEERING J2 - J VIBROENG VL - 20 PY - 2018 IS - 3 SP - 1522 EP - 1529 PG - 8 SN - 1392-8716 DO - 10.21595/jve.2018.19622 UR - https://m2.mtmt.hu/api/publication/27557264 ID - 27557264 LA - English DB - MTMT ER - TY - JOUR AU - Lam, Freddy M. H. AU - Liao, L. R. AU - Kwok, Timothy C. Y. AU - Pang, Marco Y. C. TI - Effects of adding whole-body vibration to routine day activity program on physical functioning in elderly with mild or moderate dementia: a randomized controlled trial JF - INTERNATIONAL JOURNAL OF GERIATRIC PSYCHIATRY J2 - INT J GERIATR PSYCH VL - 33 PY - 2018 IS - 1 SP - 21 EP - 30 PG - 10 SN - 0885-6230 DO - 10.1002/gps.4662 UR - https://m2.mtmt.hu/api/publication/30559061 ID - 30559061 AB - ObjectiveTo evaluate the effects of whole-body vibration (WBV) added to a routine activity program on lower limb strength, balance, and mobility among community-dwelling individuals with mild or moderate dementia, compared with the routine program alone. LA - English DB - MTMT ER - TY - JOUR AU - Sierra-Guzman, Rafael AU - Jimenez-Diaz, Fernando AU - Ramirez, Carlos AU - Esteban, Paula AU - Abian-Vicen, Javier TI - Whole-Body-Vibration Training and Balance in Recreational Athletes With Chronic Ankle Instability JF - JOURNAL OF ATHLETIC TRAINING J2 - J ATHL TRAINING VL - 53 PY - 2018 IS - 4 SP - 355 EP - 363 PG - 9 SN - 1062-6050 DO - 10.4085/1062-6050-547-16 UR - https://m2.mtmt.hu/api/publication/27557258 ID - 27557258 LA - English DB - MTMT ER - TY - JOUR AU - Toosizadeh, Nima AU - Mohler, Jane AU - Marlinski, Vladimir TI - Low intensity vibration of ankle muscles improves balance in elderly persons at high risk of falling JF - PLOS ONE J2 - PLOS ONE VL - 13 PY - 2018 IS - 3 PG - 26 SN - 1932-6203 DO - 10.1371/journal.pone.0194720 UR - https://m2.mtmt.hu/api/publication/30559059 ID - 30559059 AB - In our study we examined postural performance of young healthy persons (HY), elderly healthy persons (HE), and elderly persons at high risk of falling (FR). Anterio-posterior (AP) and medio-lateral (ML) ankle and hip angular deviations, as well as linear displacements of the center of mass (COM) were assessed in persons standing with eyes either open or closed, while none, and 40 and 30 Hz vibrations were applied bilaterally to the ankle muscle gastrocnemius. During quiet standing with eyes open, balance parameters in FR group differed from those in healthy groups. ML ankle and hip angular deviations, as well as COM linear displacements were noticeably larger in FR group. During quiet standing with eyes closed, all balance parameters in participants of all groups had a clear trend to increase. During standing with eyes open, 40 Hz vibration increased all but one balance parameter within HY group, ankle angular deviations in HE group, but none in FR group. In response to 30 Hz vibration, only ankle angular deviations and COM linear displacements increased in HY group. There were no changes in both elderly groups. During standing with eyes closed, 40 and 30 Hz vibrations did not produce consistent changes in balance parameters in HY and HE groups. In FR persons, 40 Hz vibration did not change balance parameters. However, in FR groups, 30 Hz vibration decreased ankle and hip angular deviations, and COM linear displacements. The major result of the study is a finding that low intensity vibration of ankle muscles makes balance better in elderly persons at high risk of falling. This result is clinically relevant because it suggests that applying mild vibration to ankle muscles while standing and walking might benefit elderly persons, improving their postural performance and reducing a risk of unexpected falls. LA - English DB - MTMT ER -