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Yoon H, Park C. Effectiveness of Proprioceptive Body Vibration Rehabilitation on Motor Function and Activities of Daily Living in Stroke Patients with Impaired Sensory Function. Healthcare (Basel) 2023; 12:35. [PMID: 38200941 PMCID: PMC10779045 DOI: 10.3390/healthcare12010035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 12/14/2023] [Accepted: 12/21/2023] [Indexed: 01/12/2024] Open
Abstract
Stroke patients experience impaired sensory and motor functions, which impact their activities of daily living (ADL). The current study was designed to determine the best neurorehabilitation method to improve clinical outcomes, including the trunk-impairment scale (TIS), Berg balance scale (BBS), Fugl-Meyer assessment (FMA), and modified Barthel index (MBI), in stroke patients with impaired sensory function. Forty-four stroke survivors consistently underwent proprioceptive body vibration rehabilitation training (PBVT) or conventional physical therapy (CPT) for 30 min/session, 5 days a week for 8 weeks. Four clinical outcome variables-the FMA, TIS, BBS, and MBI-were examined pre- and post-intervention. We observed significant differences in the FMA, BBS, and MBI scores between the PBVT and CPT groups. PBVT and CPT showed significant improvements in FMA, BBS, TIS, and MBI scores. However, PVBT elicited more favorable results than CPT in patients with stroke and impaired sensory function. Collectively, this study provides the first clinical evidence of optimal neurorehabilitation in stroke patients with impaired sensory function.
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Affiliation(s)
- Hyunsik Yoon
- Chungnam National University Hospital, Daejeon 35015, Republic of Korea;
- Department of Physical Therapy, Yonsei University, Wonju 26493, Republic of Korea
| | - Chanhee Park
- Department of Physical Therapy, Yonsei University, Wonju 26493, Republic of Korea
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Seim C, Chen B, Han C, Vacek D, Wu LS, Lansberg M, Okamura A. Relief of post-stroke spasticity with acute vibrotactile stimulation: controlled crossover study of muscle and skin stimulus methods. Front Hum Neurosci 2023; 17:1206027. [PMID: 37706171 PMCID: PMC10497102 DOI: 10.3389/fnhum.2023.1206027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 08/02/2023] [Indexed: 09/15/2023] Open
Abstract
Background Prior work suggests that vibratory stimulation can reduce spasticity and hypertonia. It is unknown which of three predominant approaches (stimulation of the spastic muscle, antagonist muscle, or cutaneous regions) most reduces these symptoms. Objective Determine which vibrotactile stimulation approach is most effective at reducing spastic hypertonia among post-stroke patients. Methods Sham-controlled crossover study with random assignment of condition order in fourteen patients with post-stroke hand spasticity. All patients were studied in four conditions over four visits: three stimulation conditions and a sham control. The primary outcome measure was the Modified Ashworth Scale, and the secondary outcome measure was the Modified Tardieu Scale measured manually and using 3D motion capture. For each condition, measures of spastic hypertonia were taken at four time points: baseline, during stimulation, after stimulation was removed, and after a gripping exercise. Results A clinically meaningful difference in spastic hypertonia was found during and after cutaneous stimulation of the hand. Modified Ashworth and Modified Tardieu scores were reduced by a median of 1.1 (SD = 0.84, p = 0.001) and 0.75 (SD = 0.65, p = 0.003), respectively, during cutaneous stimulation, and by 1.25 (SD = 0.94, p = 0.001) and 0.71 (SD = 0.67, p = 0.003), respectively, at 15 min after cutaneous stimulation. Symptom reductions with spastic muscle stimulation and antagonist muscle stimulation were non-zero but not significant. There was no change with sham stimulation. Conclusions Cutaneous vibrotactile stimulation of the hand provides significant reductions in spastic hypertonia, compared to muscle stimulation. Clinical trial registration www.ClinicalTrials.gov, identifier: NCT03814889.
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Affiliation(s)
- Caitlyn Seim
- Stanford University Department of Mechanical Engineering, Stanford, CA, United States
| | - Bingxian Chen
- Stanford University Department of Bioengineering, Stanford, CA, United States
| | - Chuzhang Han
- Stanford University Department of Mechanical Engineering, Stanford, CA, United States
| | - David Vacek
- Stanford University Department of Mechanical Engineering, Stanford, CA, United States
| | - Laura Song Wu
- Stanford University Department of Mechanical Engineering, Stanford, CA, United States
| | - Maarten Lansberg
- Stanford University Department of Neurology and Neurological Sciences, Stanford, CA, United States
| | - Allison Okamura
- Stanford University Department of Mechanical Engineering, Stanford, CA, United States
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Witte J, Corominas A, Ernst B, Kaulbars U, Wendlandt R, Lindell H, Ochsmann E. Acute physiological and functional effects of repetitive shocks on the hand-arm system - a pilot study on healthy subjects. INTERNATIONAL JOURNAL OF OCCUPATIONAL SAFETY AND ERGONOMICS 2022:1-10. [PMID: 35930057 DOI: 10.1080/10803548.2022.2110358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
PURPOSE Exposure to hand-transmitted shocks is a widespread phenomenon at the workplace. Separate risk assessments for shocks do not exist in current international hand-arm vibration regulations, leading to a potential underestimation of associated health risks. METHODS In a pilot study approach, N = 8 healthy males were exposed to sets of 3×5 minutes of repetitive shocks and 1×5 minutes of random vibration, controlled at a weighted vibration total value of 10 m/s2 respectively. Baseline and post-exposure measurements of vibration perception thresholds, finger skin temperature, maximal grip / pinch force and the Purdue Pegboard test were conducted. Muscle activity was monitored continuously by surface electromyography. RESULTS Shock exposures evoked a temporary increase of vibration perception thresholds with high examination frequencies. A decrease of skin temperature was hinted for 1 s-1 and 20 s-1 shocks. Electromyographical findings indicated an additional load on two forearm muscles during shock transmission. Maximum grip force and manual dexterity were not affected, pinch force only partially reduced after the exposures. CONCLUSION Physiological effects from shock exposure conform to those described for hand-arm vibration exposure in principle, although some divergence can be hypothesized. Randomized designs are required to conclusively assess the need of occupational health concepts specifically for hand-transmitted shocks.
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Affiliation(s)
- Jonathan Witte
- Luebeck Institute of Occupational Health, University of Lübeck, Lübeck, Germany
| | - Alexandra Corominas
- Luebeck Institute of Occupational Health, University of Lübeck, Lübeck, Germany
| | - Benjamin Ernst
- Institute for Occupational Safety and Health, German Social Accident Insurance, Sankt Augustin, Germany
| | - Uwe Kaulbars
- Institute for Occupational Safety and Health, German Social Accident Insurance, Sankt Augustin, Germany
| | - Robert Wendlandt
- Clinic for orthopedic and trauma surgery, University Hospital Schleswig-Holstein, Lübeck, Germany
| | - Hans Lindell
- Department of material manufacturing, Research Institutes of Sweden, Mölndal, Sweden
| | - Elke Ochsmann
- Luebeck Institute of Occupational Health, University of Lübeck, Lübeck, Germany
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Effects of vibration therapy on neuromuscular efficiency & features of the EMG signal based on endurance test. J Bodyw Mov Ther 2020; 24:325-335. [DOI: 10.1016/j.jbmt.2020.06.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 05/07/2020] [Accepted: 06/07/2020] [Indexed: 01/21/2023]
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Abstract
OBJECTIVE This study was to investigate the acute effects of hand-arm vibrations on the nerve functions of the hands, and the impact of the grip force applied to the vibrating tool during exposure. METHODS Grip strength and perception of vibration, touch, and temperature were evaluated using quantitative sensory testing (QST) before and after vibration exposure in 21 occupationally unexposed individuals. The procedure was performed twice, with a higher grip force being applied during exposure on the second occasion. RESULTS Vibration perception was significantly impaired after both exposures. Grip strength, perception of touch, and temperature were only significantly affected after the high grip force exposure. CONCLUSIONS Exposure to hand-arm vibrations has acute effects on hand nerve function that are sensitive to the grip force applied during exposure.
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Kara S, Karacan I, Cidem M, Gokmen ES, Karamehmetoğlu SS. Does the motor unit synchronization induced by vibration enhance maximal voluntary isometric contraction force? A randomized controlled double-blind trial. JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS 2018; 18:339-347. [PMID: 30179211 PMCID: PMC6146196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
OBJECTIVES Motor unit synchronization has been proposed as a potential mechanism underlying muscle strength gains for vibration training, but it has yet to be definitely demonstrated. Aim of this study was to determine whether motor unit synchronization induced by vibration has an effect on isometric muscle strength. METHODS Thirty-six healthy volunteers were randomized into two groups: the vibration and the control (sham vibration) groups. Two sets of test measurements and vibration resistance training between the two sets were applied to the right wrist flexors. The maximal voluntary isometric contraction force, and flexor carpi radialis EMG activity were recorded in the first (without vibratory stimulation) and the second (with vibratory stimulation) set. RESULTS There was no difference in the normalized peak force between the first and the second set in the vibration group (p=0.554). Motor units fired with maximal voluntary isometric contraction synchronized at the vibration frequency (25 Hz) during vibration in all participants of the vibration group. CONCLUSION The present study indicates that vibration-induced motor unit synchronization does not have a significant effect on the maximal voluntary isometric contraction force..
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Affiliation(s)
- Seher Kara
- Department of Physical Medicine and Rehabilitation, Bagcilar Training and Research Hospital, Istanbul, Turkey
| | - Ilhan Karacan
- Department of Physical Medicine and Rehabilitation, Bagcilar Training and Research Hospital, Istanbul, Turkey,Corresponding author: Ilhan Karacan, MD Assoc. Prof., Department of Physical Medicine and Rehabilitation, Bagcilar Training and Research Hospital, Istanbul 34200, Turkey E-mail:
| | - Muharrem Cidem
- Department of Physical Medicine and Rehabilitation, Bagcilar Training and Research Hospital, Istanbul, Turkey
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Acute and chronic neuromuscular adaptations to local vibration training. Eur J Appl Physiol 2017; 117:1939-1964. [PMID: 28766150 DOI: 10.1007/s00421-017-3688-8] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 07/22/2017] [Indexed: 12/19/2022]
Abstract
Vibratory stimuli are thought to have the potential to promote neural and/or muscular (re)conditioning. This has been well described for whole-body vibration (WBV), which is commonly used as a training method to improve strength and/or functional abilities. Yet, this technique may present some limitations, especially in clinical settings where patients are unable to maintain an active position during the vibration exposure. Thus, a local vibration (LV) technique, which consists of applying portable vibrators directly over the tendon or muscle belly without active contribution from the participant, may present an alternative to WBV. The purpose of this narrative review is (1) to provide a comprehensive overview of the literature related to the acute and chronic neuromuscular changes associated with LV, and (2) to show that LV training may be an innovative and efficient alternative method to the 'classic' training programs, including in the context of muscle deconditioning prevention or rehabilitation. An acute LV application (one bout of 20-60 min) may be considered as a significant neuromuscular workload, as demonstrated by an impairment of force generating capacity and LV-induced neural changes. Accordingly, it has been reported that a training period of LV is efficient in improving muscular performance over a wide range of training (duration, number of session) and vibration (frequency, amplitude, site of application) parameters. The functional improvements are principally triggered by adaptations within the central nervous system. A model illustrating the current research on LV-induced adaptations is provided.
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de Paula LV, Moreira PV, Huebner R, Szmuchrowski LA. Indirect sinusoidal vibrations induces an acute increase in explosive strength. J Electromyogr Kinesiol 2017. [DOI: 10.1016/j.jelekin.2017.05.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Variation of ankle biomechanical property according to vibro-perception threshold and vibration frequency. Biomed Eng Lett 2016. [DOI: 10.1007/s13534-016-0215-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Dallas G, Paradisis G, Kirialanis P, Mellos V, Argitaki P, Smirniotou A. The acute effects of different training loads of whole body vibration on flexibility and explosive strength of lower limbs in divers. Biol Sport 2015; 32:235-41. [PMID: 26424927 PMCID: PMC4577566 DOI: 10.5604/20831862.1163373] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 12/04/2014] [Accepted: 12/22/2014] [Indexed: 11/21/2022] Open
Abstract
The purpose of this study was to examine the acute effects of different vibration loads (frequency and amplitude) of whole-body vibration (WBV) on flexibility and explosive strength of lower limbs in springboard divers. Eighteen male and female divers, aged 19 ± 2 years, volunteered to perform 3 different WBV protocols in the present study. To assess the vibration effect, flexibility and explosive strength of lower limbs were measured before (Pre), immediately after (Post 1) and 15 min after the end of vibration exposure (Post 15). Three protocols with different frequencies and amplitudes were used in the present study: a) low vibration frequency and amplitude (30 Hz/2 mm); b) high vibration frequency and amplitude (50 Hz/4 mm); c) a control protocol (no vibration). WBV protocols were performed on a Power Plate platform, whereas the no vibration divers performed the same protocol but with the vibration platform turned off. A two-way ANOVA 3 x 3 (protocol × time) with repeated measures on both factors was used. The level of significance was set at p < 0.05. Univariate analyses with simple contrasts across time were selected as post hoc tests. Intraclass coefficients (ICC) were used to assess the reliability across time. The results indicated that flexibility and explosive strength of lower limbs were significantly higher in both WBV protocols compared to the no vibration group (NVG). The greatest improvement in flexibility and explosive strength, which occurred immediately after vibration treatment, was maintained 15 min later in both WBV protocols, whereas NVG revealed a significant decrease 15 min later, in all examined strength parameters. In conclusion, a bout of WBV significantly increased flexibility and explosive strength in competitive divers compared with the NVG. Therefore, it is recommended to incorporate WBV as a method to increase flexibility and vertical jump height in sports where these parameters play an important role in the success outcome of these sports.
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Affiliation(s)
- G Dallas
- National and Kapodistrian University of Athens, Department of Physical Education and Sport Science, Greece
| | - G Paradisis
- National and Kapodistrian University of Athens, Department of Physical Education and Sport Science, Greece
| | - P Kirialanis
- Democritus University of Thrace, Department of Physical Education and Sport Science, Greece
| | - V Mellos
- School Advisor of Physical Education and Sport Science, Greece
| | - P Argitaki
- National and Kapodistrian University of Athens, Department of Physical Education and Sport Science, Greece
| | - A Smirniotou
- National and Kapodistrian University of Athens, Department of Physical Education and Sport Science, Greece
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PEELUKHANA SV, GOENKA S, KIM B, KIM J, BHATTACHARYA A, STRINGER KF, BANERJEE RK. Effect of higher frequency components and duration of vibration on bone tissue alterations in the rat-tail model. INDUSTRIAL HEALTH 2015; 53:245-259. [PMID: 25843564 PMCID: PMC4466877 DOI: 10.2486/indhealth.2014-0117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2014] [Accepted: 01/29/2015] [Indexed: 06/04/2023]
Abstract
To formulate more accurate guidelines for musculoskeletal disorders (MSD) linked to Hand-Arm Vibration Syndrome (HAVS), delineation of the response of bone tissue under different frequencies and duration of vibration needs elucidation. Rat-tails were vibrated at 125 Hz (9 rats) and 250 Hz (9 rats), at 49 m/s(2), for 1D (6 rats), 5D (6 rats) and 20D (6 rats); D=days (4 h/d). Rats in the control group (6 rats for the vibration groups; 2 each for 1D, 5D, and 20D) were left in their cages, without being subjected to any vibration. Structural and biochemical damages were quantified using empty lacunae count and nitrotyrosine signal-intensity, respectively. One-way repeated-measure mixed-model ANOVA at p<0.05 level of significance was used for analysis. In the cortical bone, structural damage quantified through empty lacunae count was significant (p<0.05) at 250 Hz (10.82 ± 0.66) in comparison to the control group (7.41 ± 0.76). The biochemical damage was significant (p<0.05) at both the 125 Hz and 250 Hz vibration frequencies. The structural damage was significant (p<0.05) at 5D for cortical bone while the trabecular bone showed significant (p<0.05) damage at 20D time point. Further, the biochemical damage increased with increase in the duration of vibration with a significant (p<0.05) damage observed at 20D time point and a near significant change (p=0.08) observed at 5D time point. Structural and biochemical changes in bone tissue are dependent upon higher vibration frequencies of 125 Hz, 250 Hz and the duration of vibration (5D, 20D).
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Affiliation(s)
| | - Shilpi GOENKA
- Department of Mechanical and Materials Engineering,
University of Cincinnati, USA
| | - Brian KIM
- Department of Mechanical and Materials Engineering,
University of Cincinnati, USA
| | - Jay KIM
- Department of Mechanical and Materials Engineering,
University of Cincinnati, USA
| | | | - Keith F. STRINGER
- Department of Pathology, Cincinnati Children’s Hospital
Medical Centre, USA
| | - Rupak K. BANERJEE
- Department of Mechanical and Materials Engineering,
University of Cincinnati, USA
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Welcome DE, Dong RG, Xu XS, Warren C, McDowell TW, Wu JZ. An examination of the vibration transmissibility of the hand-arm system in three orthogonal directions. INTERNATIONAL JOURNAL OF INDUSTRIAL ERGONOMICS 2015; 45:21-34. [PMID: 26635424 PMCID: PMC4666322 DOI: 10.1016/j.ergon.2014.11.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
UNLABELLED The objective of this study is to enhance the understanding of the vibration transmission in the hand-arm system in three orthogonal directions (X, Y, and Z). For the first time, the transmitted vibrations distributed on the entire hand-arm system exposed in the three orthogonal directions via a 3-D vibration test system were measured using a 3-D laser vibrometer. Seven adult male subjects participated in the experiment. This study confirms that the vibration transmissibility generally decreased with the increase in distance from the hand and it varied with the vibration direction. Specifically, to the upper arm and shoulder, only moderate vibration transmission was measured in the test frequency range (16 to 500 Hz), and virtually no transmission was measured in the frequency range higher than 50 Hz. The resonance vibration on the forearm was primarily in the range of 16-30 Hz with the peak amplitude of approximately 1.5 times of the input vibration amplitude. The major resonance on the dorsal surfaces of the hand and wrist occurred at around 30-40 Hz and, in the Y direction, with peak amplitude of more than 2.5 times of the input amplitude. At higher than 50 Hz, vibration transmission was effectively limited to the hand and fingers. A major finger resonance was observed at around 100 Hz in the X and Y directions and around 200 Hz in the Z direction. In the fingers, the resonance magnitude in the Z direction was generally the lowest, and the resonance magnitude in the Y direction was generally the highest with the resonance amplitude of 3 times the input vibration, which was similar to the transmissibility at the wrist and hand dorsum. The implications of the results are discussed. RELEVANCE TO INDUSTRY Prolonged, intensive exposure to hand-transmitted vibration could result in hand-arm vibration syndrome. While the syndrome's precise mechanisms remain unclear, the characterization of the vibration transmissibility of the system in the three orthogonal dimensions performed in this study can help understand the syndrome and help develop improved frequency weightings for assessing the risk of the exposure for developing various components of the syndrome.
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Affiliation(s)
| | - Ren G. Dong
- Corresponding author. ECTB/HELD/NIOSH/CDC, 1095 Willowdale Road, MS L-2027, Morgantown, WV 26505, USA. Tel.: +1 304 285 6332; fax: +1 304 285 6265. (R.G. Dong)
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Acute Effects of Whole-Body Vibration on the Motor Function of Patients with Stroke. Am J Phys Med Rehabil 2014; 93:310-9. [DOI: 10.1097/phm.0000000000000042] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Silva A, Silva A, Dias M, Calixto R, Martinez B, Honorato D, Fernandes G. Whole body vibration training for lower limb motor function among stroke patients. INTERNATIONAL JOURNAL OF THERAPY AND REHABILITATION 2013. [DOI: 10.12968/ijtr.2013.20.5.260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Adriana Silva
- Physiotherapist and Researcher at the Department of Neurology of the Medical SciencesCollege of State University of Campinas, Brazil
| | - Andreia Silva
- Physiotherapist and Researcher at the Department of physical Therapy of Federal University of Alfenas, Brazil
| | - Miqueline Dias
- Physiotherapist and Researcher at Sapucaí Vale university, Pouso Alegre, Brazil
| | - Ruanito Calixto
- Doctor and Researcher at Sapucaí Vale university, Pouso Alegre, Brazil
| | - Beatriz Martinez
- Doctor and Researcher at Sapucaí Vale university, Pouso Alegre, Brazil
| | - Donizeti Honorato
- Doctor and Researcher at the Department of Neurology of Medical Sciences College of State University of Campinas, Brazil
| | - Geraldo Fernandes
- Doctor and Researcher at the Department of Physical Therapy at Federal University of Alfenas, Brazil
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Goenka S, Peelukhana SV, Kim J, Stringer KF, Banerjee RK. Dependence of vascular damage on higher frequency components in the rat-tail model. INDUSTRIAL HEALTH 2013; 51:373-385. [PMID: 23518603 DOI: 10.2486/indhealth.2012-0060] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Hand-Arm Vibration Syndrome (HAVS) is caused by hand-transmitted vibration in industrial workers. Current ISO guidelines (ISO 5349) might underestimate vascular injury associated with range of vibration frequencies near resonance. A rat-tail model was used to investigate the effects of higher frequencies >100 Hz on early vascular damage. 13 Male Sprague-Dawley rats (250 ± 15 gm) were used. Rat-tails were vibrated at 125 Hz and 250 Hz (49 m/s(2)) for 1D, 5D and 10D; D=days (4 h/day). Structural damage of the ventral artery was quantified by vacuole count using Toluidine blue staining whereas biochemical changes were assessed by nitrotyrosine (NT) staining. The results were analyzed using one-way repeated measures mixed-model ANOVA at p<0.05 level of significance. The structural damage increased at 125 Hz causing significant number of vacuoles (40.62 ± 9.8) compared to control group (8.36 ± 2.49) and reduced at 250 Hz (12.33 ± 2.98) compared to control group (8.36 ± 2.49). However, the biochemical alterations (NT-signal) increased significantly for 125 Hz (143.35 ± 5.8 gray scale value, GSV) and for 250 Hz (155.8 ± 7.35 GSV) compared to the control group (101.7 ± 4.18 GSV). Our results demonstrate that vascular damage in the form of structural and bio chemical disruption is significant at 125 Hz and 250 Hz. Hence the current ISO guidelines might underestimate vascular damage at frequencies>100 Hz.
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Affiliation(s)
- Shilpi Goenka
- School of Energy, Environmental, Biological and Medical Engineering, Materials Engineering Program, University of Cincinnati, USA
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Hand J, Verscheure S, Osternig L. A comparison of whole-body vibration and resistance training on total work in the rotator cuff. J Athl Train 2010; 44:469-74. [PMID: 19771284 DOI: 10.4085/1062-6050-44.5.469] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
CONTEXT Whole-body vibration machines are a relatively new technology being implemented in the athletic setting. Numerous authors have examined the proposed physiologic mechanisms of vibration therapy and performance outcomes. Changes have mainly been observed in the lower extremity after individual exercises, with minimal attention to the upper extremity and resistance training programs. OBJECTIVE To examine the effects of a novel vibration intervention directed at the upper extremity as a precursor to a supervised, multijoint dynamic resistance training program. DESIGN Randomized controlled trial. SETTING National Collegiate Athletic Association Division IA institution. PATIENTS OR OTHER PARTICIPANTS Thirteen female student-athletes were divided into the following 2 treatment groups: (1) whole-body vibration and resistance training or (2) resistance training only. INTERVENTION(S) Participants in the vibration and resistance training group used an experimental vibration protocol of 2 x 60 seconds at 4 mm and 50 Hz, in a modified push-up position, 3 times per week for 10 weeks, just before their supervised resistance training session. MAIN OUTCOME MEASURE(S) Isokinetic total work measurements of the rotator cuff were collected at baseline and at week 5 and week 10. RESULTS No differences were found between the treatment groups (P > .05). However, rotator cuff output across time increased in both groups (P < .05). CONCLUSIONS Although findings did not differ between the groups, the use of whole-body vibration as a precursor to multijoint exercises warrants further investigation because of the current lack of literature on the topic. Our results indicate that indirectly strengthening the rotator cuff using a multijoint dynamic resistance training program is possible.
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Rønnestad BR. Acute Effects of Various Whole Body Vibration Frequencies on 1RM in Trained and Untrained Subjects. J Strength Cond Res 2009; 23:2068-72. [DOI: 10.1519/jsc.0b013e3181b8652d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Analysis of the dynamic strains in a fingertip exposed to vibrations: Correlation to the mechanical stimuli on mechanoreceptors. J Biomech 2006; 39:2445-56. [PMID: 16168999 DOI: 10.1016/j.jbiomech.2005.07.027] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2005] [Accepted: 07/27/2005] [Indexed: 11/19/2022]
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Dong RG, Welcome DE, Wu JZ. Frequency weightings based on biodynamics of fingers-hand-arm system. INDUSTRIAL HEALTH 2005; 43:516-26. [PMID: 16100928 DOI: 10.2486/indhealth.43.516] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The frequency weighting for assessing hand-transmitted vibration exposure is critical to obtaining a true dose-response relationship. Any valid weighting must have a solid theoretical foundation. The objectives of this study are to examine the biodynamic foundation for assessing the vibration exposure and to develop a set of biodynamic methods to formulate the frequency weightings for different anatomical locations of the fingers-hand-arm system. The vibration transmissibility measured on the fingers, hand, wrist, elbow, shoulder, and head was used to define the transmitted acceleration-based (TAB) frequency weighting. The apparent masses measured at the fingers and the palm of the hand were used to construct the biodynamic force-based (BFB) weightings. These weightings were compared with the ISO weighting specified in ISO 5349-1 (2001). The results of this study suggest that the frequency weightings for the vibration-induced problems at different anatomical locations of the hand-arm system can be basically divided into three groups: (a) the weighting for the fingers and hand, (b) the weighting for the wrist, elbow, and shoulder, and (c) the weighting for the head. The ISO weighting is highly correlated with the weighting for the second group but not with the first and third groups. The TAB and BFB finger weightings are quite different at frequencies lower than 100 Hz, but they show similar trends at higher frequencies. Both TAB and BFB finger weightings at frequencies higher than 20 Hz are greater than the ISO weighting.
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Affiliation(s)
- Ren G Dong
- Engineering & Control Technology Branch, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, West Virginia 26505, USA
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Frymoyer J. Repetitive stress injury. J Bone Joint Surg Am 2001; 83:137-41. [PMID: 11205850 DOI: 10.2106/00004623-200101000-00019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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