Combined Application of Electrical Stimulated Antagonist Contraction During Walking (Walking Study)
NCT ID: NCT02730598
Last Updated: 2018-06-15
Study Results
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View full resultsBasic Information
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COMPLETED
NA
28 participants
INTERVENTIONAL
2016-02-29
2017-01-20
Brief Summary
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Both aerobic exercise and resistance exercise are recommended for the treatment of people with knee pain. However, pain can be a barrier to participating in exercise at a moderate or vigorous intensity. Electrical stimulation of muscles holds potential to allow effective exercise to be completed at tolerable intensities. Transcutaneous electrical nerve stimulation (TENS) is the use of very low electric currents produced by a device to stimulate the nerves, to treat pain. Neuromuscular electrical stimulation (NMES) uses low electrical current to cause muscles to contract.
By doing this study, the investigators hope to learn if a hybrid training system (HTS), using a combination of NMES and walking, is effective in strengthening muscles in people with knee pain, aching or stiffness.
In this pilot study, the investigators will use walking with TENS as conventional exercise.
Randomized controlled trial will be conducted to compare the effect of walking augmented by HTS with walking without HTS. The investigators will evaluate the relative advantages of training that combines HTS with conventional walking exercise on the improvement of muscle strength, physical function, and pain relief in obese women with frequent knee symptoms.
Study Hypotheses: Compared with walking with sensory TENS, walking with HTS will:
* 1 increase quadriceps muscle strength.
* 2 decrease knee pain.
Exploratory Hypotheses:
* 3 improve physical function.
* 4 increase PPT (improve central sensitization).
* 5 improve self-reported quality of life.
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Detailed Description
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Neuromuscular electrical stimulation (NMES) is widely used as a method to increase muscle strength and improve physical function even at a low-moderate exercise intensity (7). However, NMES effect may prove to be insufficient because the exercise intensity is determined by the electrical stimulation endurance level of the user (7). On the other hand, transcutaneous electrical stimulation, so-called transcutaneous electrical nerve stimulation (TENS), is effective for pain relief (8). Knee pain independently reduced quadriceps strength and activation (9). TENS restores inhibited quadriceps motor function (central and muscle activation) through pain relief (10). Moreover the combined application of electrical stimulation (ES) and volitional contractions (VC) is said to be more effective than ES or VC alone (11). Therefore, a hybrid training system (HTS) that resists the motion of a volitionally contracting agonist muscle using the force generated by its electrically stimulated antagonist (NMES) was developed as a way to combine the application of electrical stimulation and voluntary contraction (12). HTS is a method that eliminates the disadvantages of both volitional exercise and NMES (13). It has been reported that HTS is a new training technique that can increase both muscular strength and muscle mass (12, 13, 14, 15). Recently, HTS is showing promise as a countermeasure for the musculoskeletal disuse of astronauts because the HTS technique can generate exercise resistance within the body even if there is no gravity (1). In addition, HTS can be utilized during many different types of exercise (e.g. knee extension exercise, squat and hip flexion, walking exercise, and cycling exercise) (17, 18). It seems to be more effective for improvement of muscle strength and physical function to combine HTS with easy exercise (e.g. knee extension, walking, and squats) for KOA patients.
The main purpose of exercise therapy for KOA is not only muscular strength improvement (the quadriceps femoris muscle in particular) and but also pain relief (19, 20). Muscular strength improvement protects joints and relieves nociceptive stimulation. However, exercise sometimes increases pain. In addition to the pathological change in articular structures, changes in central pain processing or central sensitization appear to be involved in KOA pain (19). Murphy et al. reported that 36% of a heterogenous sample of patients with hip and KOA demonstrated evidence of central sensitization (22). This finding has been incompletely characterized, but it is necessary to consider central sensitization in the treatment of patients with KOA. From a theoretical perspective, exercise has the potential to treat the process of central sensitization: e.g. exercise activates brain-orchestrated endogenous analgesia (23). An initial bout of high intensity eccentric exercise induces central sensitization, but a repeated round of exercise facilitates inherent protective spinal mechanisms (repeated bout effect) (24). Moreover, ipsilateral resistance exercise may possibly prevent the central sensitization (25). Therefore, a time-contingent approach which implies that the patient does not cease exercise bouts once local pain severity increases is recommended (22). A few reports about the dysfunctional endogenous analgesia for patients with musculoskeletal pain response to aerobic exercise were shown, but neither type of aerobic exercise was able to activate endogenous analgesia (24). At present, there is no report of an exercise method that is effective in central sensitization pain patients. Brain-derived neurotrophic factor (BDNF) belongs to the neurotrophic family of growth factors. The loss of BDNF usually leads to neurodegeneration in these motor centers and eventually results in several severe motor diseases, such as amyotrophic lateral sclerosis, spinocerebellar ataxias, Parkinson's disease, Huntington's disease, as well as vestibular syndrome. These neurotrophic factors (e.g., decreasing brain-derived neurotrophic factor) are promising new avenues for diminishing hyperexcitability of the CNS in central sensitization pain patients (2). Da Graca-Tarrago et al. showed that a 30-minute electrical intramuscular stimulation in osteoarthritis decreased pain, increased the local pain pressure threshold (PPT), and decreased BDNF (27). Gajewska-Wozniak et al. reported that low-threshold electrical stimulation of peripheral nerves to stimulate Ia afferent fibers (proprioceptive signaling) might affect the expression of BDNF in rats (28). HTS is an exercise technique that uses electrically eccentric muscle contraction. Yamaguchi et al. showed that the soleus H-reflex increased after one HTS adversely in conventional resistance exercise (29). This seems to indicate that HTS serves to activate Ia fibers. HTS may affect central sensitization and relieve pain in KOA patients.
Conditions
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Study Design
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RANDOMIZED
PARALLEL
TREATMENT
SINGLE
Study Groups
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Hybrid Training System (HTS)
HTS stimulation while walking at a comfortable pace for 30 minutes.
Hybrid Training System (HTS)
Electrodes (15 cm x 6 cm) will be placed over the quadriceps and electrodes (11 cm x 6 cm) (Sekisui Plastics Co., Tokyo, Japan) will be placed over the hamstrings. Electrical stimulation parameters will be based on a standard Russian waveform in which a 5,000 Hz carrier frequency is modulated at 40 Hz (2.4 ms on, 22.6 ms off) to deliver a rectangular voltage biphasic pulse. Acceleration sensors as a joint motion sensor (EWTS9PD, Home Appliances Development Center Corporate Engineering Division, Appliances Company Panasonic Corporation 2-3-1-2 Noji-higashi,Kusatsu City, Shiga, Japan) is placed on the front of each leg 88mm above the patellar edge. It analyzes the algorithm of each exercise pattern, and stimulates the antagonist of the motion of each bilateral knee joint during exercise. Electrical stimulation intensity will be set to \~50-60% of 1RM based on the subject's tolerance. The subject's tolerance gradually increases, and electrical stimulation intensity is reset every 2 weeks.
Transcutaneous Electrical Nerve Stimulation (TENS)
Sensory TENS while walking at a comfortable pace for 30 minutes.
Sensory TENS
The electrical stimulation intensity will be set under the muscle contraction threshold (but at a level at which the subject can perceive as sensory TENS). Electrical stimulation parameters (i.e. waveform and pulse duration) will be the same of HTS, while the amplitude will be lower. The subject will be stimulated using the same device as for HTS.
Interventions
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Hybrid Training System (HTS)
Electrodes (15 cm x 6 cm) will be placed over the quadriceps and electrodes (11 cm x 6 cm) (Sekisui Plastics Co., Tokyo, Japan) will be placed over the hamstrings. Electrical stimulation parameters will be based on a standard Russian waveform in which a 5,000 Hz carrier frequency is modulated at 40 Hz (2.4 ms on, 22.6 ms off) to deliver a rectangular voltage biphasic pulse. Acceleration sensors as a joint motion sensor (EWTS9PD, Home Appliances Development Center Corporate Engineering Division, Appliances Company Panasonic Corporation 2-3-1-2 Noji-higashi,Kusatsu City, Shiga, Japan) is placed on the front of each leg 88mm above the patellar edge. It analyzes the algorithm of each exercise pattern, and stimulates the antagonist of the motion of each bilateral knee joint during exercise. Electrical stimulation intensity will be set to \~50-60% of 1RM based on the subject's tolerance. The subject's tolerance gradually increases, and electrical stimulation intensity is reset every 2 weeks.
Sensory TENS
The electrical stimulation intensity will be set under the muscle contraction threshold (but at a level at which the subject can perceive as sensory TENS). Electrical stimulation parameters (i.e. waveform and pulse duration) will be the same of HTS, while the amplitude will be lower. The subject will be stimulated using the same device as for HTS.
Eligibility Criteria
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Inclusion Criteria
2. Age 40-70 years
3. Knee symptoms (pain, aching, or stiffness) on most of the last 30 days (categorically defined)
4. Body Mass Index (BMI) 30-45kg/m2
Exclusion Criteria
2. Bilateral knee replacement
3. Lower limb amputation
4. Lower limb surgery in the last 6 months that affects walking ability or ability to exercise
5. Back or hip problems that affect walking ability or ability to exercise
6. Unable to walk without a cane or walker
7. Inflammatory joint or muscle disease such as rheumatoid or psoriatic arthritis or polymyalgia rheumatica
8. Multiple sclerosis or other neurodegenerative disorder
9. Known neuropathy
10. Currently being treated with insulin for diabetes
11. Currently being treated for cancer or having untreated cancer
12. Terminal illness (cannot be cured or adequately treated and there is a reasonable expectation of death in the near future)
13. Peripheral Vascular Disease
14. History of myocardial infarction or stroke in the last year
15. Chest pain during exercise or at rest
16. Use of supplemental oxygen
17. Inability to follow protocol (e.g. lack of ability to attend visits or understand instructions)
18. Staff concern for participant health (such as history of dizziness/faintness or current restrictions on activity)
19. Unable to attend more than 2 days within any 1 week or unable to attend 4 or more sessions during the study
20. Implanted cardiac pacemaker, spinal cord stimulator, baclofen or morphine pump or other implanted electrical device.
21. Dermatitis or skin sensitivity to tape used in the study.
22. Pregnancy
39 Years
70 Years
FEMALE
No
Sponsors
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Kurume University
OTHER
University of Kansas Medical Center
OTHER
Responsible Party
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Neil Segal, MD, MS
Professor and Faculty Physiatrist
Principal Investigators
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Neil A Segal, MD
Role: PRINCIPAL_INVESTIGATOR
University of Kansas Medical Center
Locations
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University of Kansas Medical Center
Kansas City, Kansas, United States
Countries
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References
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Matsuse H, Segal NA, Rabe KG, Shiba N. Effect of Neuromuscular Electrical Stimulation During Walking on Pain Sensitivity in Women With Obesity With Knee Pain: A Randomized Controlled Trial. Arch Phys Med Rehabil. 2022 Sep;103(9):1707-1714. doi: 10.1016/j.apmr.2022.01.157. Epub 2022 Mar 23.
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Provided Documents
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Document Type: Informed Consent Form
Document Type: Study Protocol and Statistical Analysis Plan
Other Identifiers
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STUDY00003435
Identifier Type: -
Identifier Source: org_study_id
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