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Yang H, Lv Y, Chen S, Xing B, Wu J. An Evaluation Study of a New Designed Oscillating Hydraulic Trainer of Neck. Healthcare (Basel) 2023; 11:healthcare11101518. [PMID: 37239804 DOI: 10.3390/healthcare11101518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/07/2023] [Accepted: 05/18/2023] [Indexed: 05/28/2023] Open
Abstract
In view of the importance of neck strength training and the lack of adequate training equipment, this study designed a new oscillating hydraulic trainer (OHT) of neck based on oscillating hydraulic damper. We used surface electromyography (sEMG) and subjective ratings to evaluate the neck OHT and compared the results with a simple hat trainer (HATT) and traditional weight trainer (TWT) to verify the feasibility and validity of the OHT. Under similar exercise conditions, 12 subjects performed a set of neck flexion and extension exercise with these 3 trainers. The sEMG signals of targeted muscles were collected in real time, and subjects were asked to complete subjective evaluations of product usability after exercise. The results showed that the root mean square (RMS%) of sEMG indicated that the OHT could provide two-way resistance and train the flexors and extensors simultaneously. The overall degree of muscle activation with OHT was higher than that with the other two trainers in one movement cycle. In terms of resistance characteristics exhibited by the sEMG waveform, duration (D) with OHT was significantly longer than HATT and TWT when exercising at a high speed, while Peak Timing (PT) was later. The ratings of product usability and performing usability of OHT were remarkably higher than that of HATT and TWT. Based on the above results, the OHT was proved to be more suitable for strength training, such as neck muscles, which were getting more attention gradually, but lacked mature and special training equipment.
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Affiliation(s)
- Hongchun Yang
- Design and Research Institute, Zhejiang University of Technology, Hangzhou 310023, China
| | - Yawei Lv
- School of Design and Architecture, Zhejiang University of Technology, Hangzhou 310023, China
| | - Sisi Chen
- School of Design and Architecture, Zhejiang University of Technology, Hangzhou 310023, China
| | - Baixi Xing
- Design and Research Institute, Zhejiang University of Technology, Hangzhou 310023, China
| | - Jianfeng Wu
- Design and Research Institute, Zhejiang University of Technology, Hangzhou 310023, China
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The Effect of Fu’s Subcutaneous Needling Combined with Reperfusion Approach on Surface Electromyography Signals in Patients with Cervical Spondylosis and Neck Pain: A Clinical Trial Protocol. BIOMED RESEARCH INTERNATIONAL 2022; 2022:1761434. [PMID: 36193322 PMCID: PMC9526609 DOI: 10.1155/2022/1761434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/06/2022] [Accepted: 08/18/2022] [Indexed: 11/18/2022]
Abstract
Background Neck pain is one of the most common musculoskeletal diseases. Fu's subcutaneous needling therapy is a special acupuncture method that targets muscle trigger points. It has been proven to have a positive effect on the treatment of neck pain. The access to its curative effect may be related to the improvement of muscle and soft tissue condition. The purpose of this study is to evaluate the outcome of Fu's subcutaneous needling therapy for patients with neck pain by collecting changes in the sEMG of the patient's neck muscles and related data from evaluation scales and explore the feasibility and safety of Fu's subcutaneous needling therapy for neck pain. Methods 72 patients meeting the inclusion criteria were randomly divided into FSN group and acupuncture group for corresponding treatment. FSN group was treated once every other day for 5 consecutive treatments; the acupuncture group was treated once a day for 10 consecutive treatments. Result Outcome indicators were measured at baseline, after the first treatment and the end of the treatment. Primary outcome indicators: average EMG (AEMG) and (mean power frequency) MPF of sternocleidomastoid muscle and superior trapezius muscle. Secondary outcome indicators: Mc Gill pain questionnaire (MPQ), neck disability index (NDI), and adverse reactions. Conclusions This study will explore the efficacy, safety, and possible mechanism of Fu's subcutaneous needling therapy for patients with neck pain, thus to provide more evidence support for clinical decision-making. This trial is registered with Chinese Clinical Trial Register Center (registration number ChiCTR2100043529).
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Gorrell LM, Conway PJ, Onasch F, Herzog W. Electromyographic Responses of Neck, Back, and Limb Outlet Muscles Associated With High-Velocity, Low-Amplitude Manual Cervical and Upper Thoracic Spinal Manipulation of Individuals With Mild Neck Disability: A Descriptive Observational Investigation. J Manipulative Physiol Ther 2022; 45:33-44. [PMID: 35753874 DOI: 10.1016/j.jmpt.2022.03.018] [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: 08/20/2020] [Revised: 03/18/2022] [Accepted: 03/18/2022] [Indexed: 10/17/2022]
Abstract
OBJECTIVES The purpose of this study was to investigate the extent of electromyographic responses associated with manual high-velocity, low-amplitude (HVLA) spinal manipulation systematically applied to the upper and lower cervical and upper thoracic spines in a cohort with mild neck disability. METHODS The study was a descriptive observational investigation, with all participants receiving the same interventions. Nineteen participants with mild neck disability received 6 manual HVLA manipulations to the cervical and upper thoracic spine. Bipolar surface electromyography electrode pairs were used to measure responses of 16 neck, back, and limb outlet muscles bilaterally. The number of electromyographic responses was then calculated. RESULTS Electromyographic responses associated with cervical and thoracic manipulation occurred in a median of 4 of the 16 (range: 1-14) recorded muscles. Cervical spinal manipulation was associated with the highest rates of electromyographic responses in neck muscles, whereas responses in back muscles were highest after upper thoracic manipulation. CONCLUSION Cervical spinal manipulation was associated with the highest rate of electromyographic responses in muscles of the cervical spine (sternocleidomastoid and splenius cervicis), whereas responses in back muscles (upper and middle trapezius, latissimus dorsi, and longissimus thoracis) were highest after upper thoracic manipulations. This result suggests that electromyographic muscular responses associated with spinal manipulation primarily occur locally (close to the target segment) rather than distally.
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Affiliation(s)
- Lindsay M Gorrell
- Integrative Spinal Research Group, Department of Chiropractic Medicine, Balgrist University Hospital, Zurich, Switzerland; University of Zurich, Zurich, Switzerland.
| | | | - Franziska Onasch
- Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Walter Herzog
- Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
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Tsang SM, Chan KT, Ho PL, Kwok JC, Tse DH, Tsoi HH. Comparison between velocity-specific exercise and isometric exercise on neck muscle functions and performance: a randomised clinical trial. BMC Musculoskelet Disord 2021; 22:81. [PMID: 33446159 PMCID: PMC7809848 DOI: 10.1186/s12891-021-03943-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 01/02/2021] [Indexed: 11/24/2022] Open
Abstract
Background Evidence has shown that velocity-specific exercise results in additional benefits for peripheral joint muscles by promoting their functions, however, its effects on spinal muscles are yet to be investigated. This study aimed to examine the feasibility and effects of velocity-specific exercise compared to isometric exercise on cervical muscle functions and performance in healthy individuals. Methods Thirty healthy adults were randomised to practise either the velocity-specific exercise (VSE, n = 15) or isometric exercise (IE, n = 15) for 6 weeks. Functions and performance of the cervical extensors and flexors were assessed pre- and post-program, by analyzing the peak torque and electromyography during the isokinetic testing, and cross-sectional area of the deep cervical muscles at rest. The self-reported level of difficulty and post-exercise soreness during the exercise were recorded to evaluate the feasibility and safety of the two exercise programs. Results Both VSE and IE exercises resulted in significant improvement of the muscle functions and performance while there were no between-group differences at reassessment of the (a) cross-sectional area of longus colli and semispinalis capitis; (b) EMG amplitude in sternocleidomastoid and cervical erector spinae, and (c) peak torque values. Further analysis revealed that degree of correlation between extension torque and EMG amplitude of cervical erector spinae increased in both groups. However, significant correlation was found only in VSE group post-program. There were no significant differences for the level of difficulty and post-exercise soreness found between two groups. Conclusions Both velocity-specific and isometric exercises significantly promoted cervical muscle functions and performance. The present study confirms that velocity-specific exercise can be practised safely and it also contributes to a greater enhancement in neuromuscular efficiency of the cervical extensors. These findings indicate that the velocity-specific exercise can be considered as a safe alternative for training of the cervical muscles. Further study is recommended to examine its benefit and application for promoting the muscle functions and recovery in symptomatic individuals.
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Affiliation(s)
- Sharon Mh Tsang
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Yuk Choi Road, Hung Hom, Kowloon, Hong Kong, China.
| | - Kenneth Tk Chan
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Yuk Choi Road, Hung Hom, Kowloon, Hong Kong, China
| | - Parco Lt Ho
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Yuk Choi Road, Hung Hom, Kowloon, Hong Kong, China
| | - Jacky Cy Kwok
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Yuk Choi Road, Hung Hom, Kowloon, Hong Kong, China
| | - Daniel Ht Tse
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Yuk Choi Road, Hung Hom, Kowloon, Hong Kong, China
| | - Henry Ht Tsoi
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Yuk Choi Road, Hung Hom, Kowloon, Hong Kong, China
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Gorrell LM, Conway PJ, Herzog W. Differences in force-time parameters and electromyographic characteristics of two high-velocity, low-amplitude spinal manipulations following one another in quick succession. Chiropr Man Therap 2020; 28:67. [PMID: 33287851 PMCID: PMC7722317 DOI: 10.1186/s12998-020-00355-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 11/16/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Spinal manipulative therapy is an effective treatment for neck pain. However, the mechanisms underlying its clinical efficacy are not fully understood. Previous studies have not systematically compared force-time parameters and electromyographic responses associated with spinal manipulation. In this study, force-time parameters and electromyographic characteristics associated with multiple manual high-velocity, low-amplitude cervical and upper thoracic spinal manipulations were investigated. The purpose of this analysis was to compare the force-time parameters and electromyographic characteristics between two spinal manipulations delivered following one another in quick succession if the first thrust was not associated with an audible cavitation. METHODS Nine asymptomatic and eighteen symptomatic participants received six Diversified-style spinal manipulations to the cervical and upper thoracic spines during data collected February 2018 to September 2019. Peak force, rate of force application and thrust duration were measured using a pressure pad. Bipolar surface electrodes were used to measure the electromyographic responses and reflex delay times in sixteen neck, back and limb outlet muscles bilaterally. Differences in force-time parameters and electromyographic data were analyzed between the first and second thrust. RESULTS Fifty-two spinal manipulations were included in this analysis. Peak force was greater (p < 0.001) and rate of force application faster (p < 0.001) in the second thrust. Furthermore, peak electromyographic responses were higher following the second thrust in asymptomatic (p < 0.001) and symptomatic (p < 0.001) subjects. Also, electromyographic delays were shorter in the symptomatic compared to the asymptomatic participants for the second thrust (p = 0.039). There were no adverse patient events. CONCLUSION When a second manipulation was delivered because there was not audible cavitation during the first thrust, the second thrust was associated with greater treatment forces and faster thrust rates. Peak electromyographic responses were greater following the second thrust.
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Affiliation(s)
- Lindsay M. Gorrell
- Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta Canada
- Chiropractor, Private Practice, Calgary, Alberta Canada
| | | | - Walter Herzog
- Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta Canada
- Biomechanics Laboratory, School of Sports, Federal University of Santa Catarina, Florianopolis, SC Brazil
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Improving the staging of neck injuries using a new index, the Neck Functional Holistic Analysis Score: Clustering approach to determine degrees of impairment. PLoS One 2020; 15:e0238424. [PMID: 32903259 PMCID: PMC7480840 DOI: 10.1371/journal.pone.0238424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 08/17/2020] [Indexed: 11/24/2022] Open
Abstract
Background Traumatic cervical spine injuries are amongst the traffic injuries that can cause most harm to a person. Classifying subtypes of clinical presentations has been a method used in other pathologies to diagnose more efficiently and to address the appropriate treatment and the prognosis. The management of patients suffering from cervical injuries could be improved by classifying the severity of the impairment. This will allow clinicians to propose better treatment modalities according to the severity of the injury. Materials and methods The present study is a retrospective cohort study performed with the clinical data from 772 patients stored at Fisi-(ON) Health Group. All the patients treated for cervical spine injuries are evaluated using the EBI-5® system, which is based on inertial measurement unit (IMU) technology. The normalized range of motion of each patient was incorporated into a single index, the Neck Functional Holistic Analysis Score (NFHAS). Results Clustering analysis of the patients according to their NFHAS resulted in five groups. The Kruskal-Wallis H test showed that there were statistically relevant differences in the ROM values and NFHAS of the patients depending on the cluster they were assigned to: FE X2(4) = 551.59, p = 0.0005; LB ROM X2(4) = 484.58, p = 0.0005; RT ROM X2(4) = 557.14, p = 0.0005; NFHAS X2(4) = 737.41, p = 0.0005. Effect size with ηp2 for the comparison of groups were: FE = 0.76, LB = 0.68, RT = 0.76 and NFHAS = 0.96. Conclusion The NFHAS is directly correlated to the available ROM of the patient. The NFHAS serves as a good tool for the classification of cervical injury patients. The degree of impairment shown by the cervical injury can now be staged correctly using this new classification.
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Wang Y, Wu Q, Dey N, Fong S, Ashour AS. Deep back propagation–long short-term memory network based upper-limb sEMG signal classification for automated rehabilitation. Biocybern Biomed Eng 2020. [DOI: 10.1016/j.bbe.2020.05.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Lascurain-Aguirrebeña I, Newham DJ, Casado-Zumeta X, Lertxundi A, Critchley DJ. Immediate effects of cervical mobilisations on neck muscle activity during active neck movements in patients with non-specific neck pain. A double blind placebo controlled trial. Physiotherapy 2019; 110:42-53. [PMID: 33131786 DOI: 10.1016/j.physio.2019.07.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Indexed: 11/26/2022]
Abstract
BACKGROUND Cervical mobilisations are used to treat people with neck pain but their mechanisms of action are unclear. One theorised reason for induced analgesia is effect on neck muscle activity. OBJECTIVES To assess the effects of cervical mobilisations on muscle activity during active neck movements and whether changes in muscle activity are associated with changes in symptoms. DESIGN Double-blind randomised placebo controlled trial. SETTING Primary care. PARTICIPANTS 40 patients (aged 19 to 80 years, 24 female) with non-specific neck pain. INTERVENTIONS One session of cervical mobilisations or motionless manual contact (placebo). MAIN OUTCOME MEASURES sternocleidomastoid (SCM), scalene (SCA), upper trapezius (UT) and erector spinae (ES) surface electromyography (SEMG) during active neck flexion, extension, side flexion and rotation was measured immediately before and after the intervention. Patients were classified as responders according to change in symptoms assessed using the Global Rating of Change Scale (GROC). RESULTS Compared with placebo, patients receiving mobilisation showed an increase in contralateral UT and ES SEMG during rotation and contralateral and ipsilateral SCM, SCA and UT during side flexion (P<0.05), however changes were mostly associated with an increase in range and speed of movement. The only association with GROC was increased (5%) SEMG in the contralateral SCM during side flexion in the mobilisation group (P=0.013). CONCLUSION Cervical mobilisations caused increased neck SEMG, mostly due to increased movement range and speed. Change in muscle activity is unlikely to be a major mechanism of action of cervical mobilisations in symptomatic improvement with physiological neck movements. (ClinicalTrials.gov record number: 2016/066). CLINICAL TRIALS REGISTRY ClinicalTrials.gov record number: 2016/066.
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Affiliation(s)
- Ion Lascurain-Aguirrebeña
- Division of Health and Social Care Research, Faculty of Life Sciences & Medicine, King's College London, London SE1 1UL, United Kingdom; Department of Physiology, Faculty of Medicine & Nursing, University of the Basque Country UPV/EHU, Leioa 48940, Spain.
| | - Di J Newham
- Centre of Human & Applied Physiological Sciences, Faculty of Life Sciences & Medicine, King's College London, London SE1 1UL, United Kingdom.
| | | | - Aitana Lertxundi
- Department of Preventive Medicine and Public Health, University of the Basque Country UPV/EHU, Leioa 48940, Spain; Health Research Institute, Biodonostia, San Sebastian, Spain; Spanish Consortium for Research on Epidemiology and Public Health (CIBERESP), Barcelona, Spain.
| | - Duncan J Critchley
- Division of Health and Social Care Research, Faculty of Life Sciences & Medicine, King's College London, London SE1 1UL, United Kingdom.
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Lascurain-Aguirrebeña I, Newham DJ, Casado-Zumeta X, Lertxundi A, Critchley DJ. Immediate effects of cervical mobilisations on global perceived effect, movement associated pain and neck kinematics in patients with non-specific neck pain. A double blind placebo randomised controlled trial. Musculoskelet Sci Pract 2018; 38:83-90. [PMID: 30342295 DOI: 10.1016/j.msksp.2018.10.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 10/02/2018] [Accepted: 10/08/2018] [Indexed: 01/14/2023]
Abstract
BACKGROUND Neck pain is prevalent, costly and disabling. Cervical mobilisations are frequently used to treat it but their effectiveness has been questioned by several systematic reviews. Evidence suggests that better outcomes are achieved with mobilisations when they are applied to specific patient subgroups. A criteria for patients suitable for neck mobilisations has been proposed, but the effectiveness on this patient subgroup has not been tested. OBJECTIVE To assess the effectiveness of cervical mobilisations applied to a subgroup of patients with neck pain who fulfil specific criteria. DESIGN Randomised controlled trial. METHOD 40 patients with neck pain attending a Physiotherapy clinic were recruited and randomised to a single session of either cervical mobilisations or motionless manual contact placebo. The immediate effects on global perceived effect, range of movement (ROM), movement velocity and movement associated pain were assessed. RESULTS mobilisation participants reported significantly better global perceived effect (p˂0.001) and improvements in movement associated pain (p = 0.041). Mobilisations produced a significant increase in ROM in side flexion (p = 0.006) and rotation (p = 0.044) when compared with placebo, but only in patients with pre-intervention ROM restriction. 29-47% of all movement associated pains were resolved following mobilisations and 11-27% following placebo. Patients in both groups showed a significant (p < 0.05) increase in movement velocity, but only in those who had a velocity restriction pre-intervention. CONCLUSIONS Cervical mobilisations are effective in improving movement-associated pain, increasing ROM and velocity, and patient perceived improvement when applied to patients with neck pain that fulfil a criteria. Their use should be advocated.
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Affiliation(s)
- Ion Lascurain-Aguirrebeña
- Division of Health and Social Care Research, Faculty of Life Sciences & Medicine, King's College London, London, SE1 1UL, United Kingdom; Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country UPV/EHU, Leioa, 48940, Spain.
| | - Di J Newham
- Centre of Human & Applied Physiological Sciences, Faculty of Life Sciences & Medicine, King's College London, London, SE1 1UL, United Kingdom.
| | | | - Aitana Lertxundi
- Department of Preventive Medicine and Public Health, University of the Basque Country UPV/EHU, Leioa, 48940, Spain; Health Research Institute, Biodonostia, San Sebastian, Spain; Spanish Consortium for Research on Epidemiology and Public Health (CIBERESP), Barcelona, Spain.
| | - Duncan J Critchley
- Division of Health and Social Care Research, Faculty of Life Sciences & Medicine, King's College London, London, SE1 1UL, United Kingdom.
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Lascurain-Aguirrebeña I, Newham DJ, Galarraga-Gallastegui B, Critchley DJ. Differences in neck surface electromyography, kinematics and pain occurrence during physiological neck movements between neck pain and asymptomatic participants. A cross-sectional study. Clin Biomech (Bristol, Avon) 2018; 57:1-9. [PMID: 29864606 DOI: 10.1016/j.clinbiomech.2018.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 04/25/2018] [Accepted: 05/21/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Neck pain has been associated with altered muscle activity and impaired kinematics. Patients frequently report pain during physiological neck movements. Previously, the average muscle activity during these movements has been measured. However, muscle activity is modulated by the position in the range of movement, hence the study of neck muscle activity in discrete sections of the range of movement is warranted. Evidence is conflicting regarding range of movement restriction in neck pain. No study has assessed the point in the range of movement at which pain occurs. This study aimed to investigate neck kinematics, muscle activity and pain during physiological neck movements in participants with and without neck pain. METHODS Neck kinematics and surface electromyography were recorded continuously and analysed in 10° increments during forward and side flexion, extension and rotation of the neck in 20 neck pain and 20 asymptomatic participants. Point of pain occurrence in the range of movement was recorded. FINDINGS Neck pain participants demonstrated significantly lower activity of scalene during flexion and extension, and a non-significant higher activity in sternocleidomastoids during rotation. No differences in neck kinematics were observed. 65% of neck pain participants reported pain during at least one neck movement. Pain was reported in the last ≈20-40% of the range of movement. INTERPRETATION Exercises used in current practice to minimise scalene activity may not be appropriate for all neck pain patients. Restricted range of movement is not a consistent feature of neck pain. Movement associated neck pain is present at the end of range of movement, which has implications for the study of neck pain and rehabilitation.
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Affiliation(s)
- Ion Lascurain-Aguirrebeña
- School of Population Sciences and Health Services Research, Faculty of Life Sciences & Medicine, King's College London, London SE1 1UL, United Kingdom; Department of Physiology, Faculty of Medicine & Odontology, University of the Basque Country, Leioa 48940, Spain.
| | - Di J Newham
- Centre of Human & Aerospace Physiological Sciences, Faculty of Life Sciences & Medicine, King's College London, London SE1 1UL, United Kingdom.
| | | | - Duncan J Critchley
- School of Population Sciences and Health Services Research, Faculty of Life Sciences & Medicine, King's College London, London SE1 1UL, United Kingdom.
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