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Winter L, Taylor P, Bellenger C, Grimshaw P, Crowther RG. The application of the Lyapunov Exponent to analyse human performance: A systematic review. J Sports Sci 2023; 41:1994-2013. [PMID: 38326239 DOI: 10.1080/02640414.2024.2308441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 01/15/2024] [Indexed: 02/09/2024]
Abstract
Variability is a normal component of human movement, allowing one to adapt to environmental perturbations. It can be analysed from linear or non-linear perspectives. The Lyapunov Exponent (LyE) is a commonly used non-linear technique, which quantifies local dynamic stability. It has been applied primarily to walking gait and appears to be limited application in other movements. Therefore, this systematic review aims to summarise research methodologies applying the LyE to movements, excluding walking gait. Four databases were searched using keywords related to movement variability, dynamic stability, LyE and divergence exponent. Articles written in English, using the LyE to analyse movements, excluding walking gait were included for analysis. 31 papers were included for data extraction. Quality appraisal was conducted and information related to the movement, data capture method, data type, apparatus, sampling rate, body segment/joint, number of strides/steps, state space reconstruction, algorithm, filtering, surrogation and time normalisation were extracted. LyE values were reported in supplementary materials (Appendix 2). Running was the most prevalent non-walking gait movement assessed. Methodologies to calculate the LyE differed in various aspects resulting in different LyE values being generated. Additionally, test-retest reliability, was only conducted in one study, which should be addressed in future.
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Affiliation(s)
- Lachlan Winter
- UniSA Allied Health and Human Performance, University of South Australia, Adelaide, South Australia, Australia
- Alliance for Research in Exercise, Nutrition & Activity (ARENA), University of South Australia, Adelaide, South Australia, Australia
| | - Paul Taylor
- School of Behavioural and Health Sciences, Australian Catholic University, North Sydney, New South Wales, Australia
| | - Clint Bellenger
- UniSA Allied Health and Human Performance, University of South Australia, Adelaide, South Australia, Australia
- Alliance for Research in Exercise, Nutrition & Activity (ARENA), University of South Australia, Adelaide, South Australia, Australia
| | - Paul Grimshaw
- College of Health and Life Sciences, Hamad Bin Khalifa University, Doha, Qatar
- Faculty of Sciences, Engineering and Technology, Computer and Mathematical Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Robert G Crowther
- UniSA Allied Health and Human Performance, University of South Australia, Adelaide, South Australia, Australia
- Alliance for Research in Exercise, Nutrition & Activity (ARENA), University of South Australia, Adelaide, South Australia, Australia
- School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Victoria, Australia
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Nonlinear Analyses Distinguish Load Carriage Dynamics in Walking and Standing: A Systematic Review. J Appl Biomech 2022; 38:434-447. [PMID: 36170973 DOI: 10.1123/jab.2022-0062] [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: 03/03/2022] [Revised: 08/08/2022] [Accepted: 08/15/2022] [Indexed: 11/18/2022]
Abstract
Load carriage experiments are typically performed from a linear perspective that assumes that movement variability is equivalent to error or noise in the neuromuscular system. A complimentary, nonlinear perspective that treats variability as the object of study has generated important results in movement science outside load carriage settings. To date, no systematic review has yet been conducted to understand how load carriage dynamics change from a nonlinear perspective. The goal of this systematic review is to fill that need. Relevant literature was extracted and reviewed for general trends involving nonlinear perspectives on load carriage. Nonlinear analyses that were used in the reviewed studies included sample, multiscale, and approximate entropy; the Lyapunov exponent; fractal analysis; and relative phase. In general, nonlinear tools successfully distinguish between unloaded and loaded conditions in standing and walking, although not in a consistent manner. The Lyapunov exponent and entropy were the most used nonlinear methods. Two noteworthy findings are that entropy in quiet standing studies tends to decrease, whereas the Lyapunov exponent in walking studies tends to increase, both due to added load. Thus, nonlinear analyses reveal altered load carriage dynamics, demonstrating promise in applying a nonlinear perspective to load carriage while also underscoring the need for more research.
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Schrøder Jakobsen L, Madeleine P, Pavailler S, Lefebvre F, Giandolini M. The effects of unstable surface conditions on lower limb biomechanical parameters during running. J Biomech 2022; 141:111214. [DOI: 10.1016/j.jbiomech.2022.111214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 06/28/2022] [Accepted: 06/28/2022] [Indexed: 12/01/2022]
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Nohelova D, Bizovska L, Vuillerme N, Svoboda Z. Gait Variability and Complexity during Single and Dual-Task Walking on Different Surfaces in Outdoor Environment. SENSORS (BASEL, SWITZERLAND) 2021; 21:4792. [PMID: 34300532 PMCID: PMC8309897 DOI: 10.3390/s21144792] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 07/09/2021] [Accepted: 07/11/2021] [Indexed: 11/28/2022]
Abstract
Nowadays, gait assessment in the real life environment is gaining more attention. Therefore, it is desirable to know how some factors, such as surfaces (natural, artificial) or dual-tasking, influence real life gait pattern. The aim of this study was to assess gait variability and gait complexity during single and dual-task walking on different surfaces in an outdoor environment. Twenty-nine healthy young adults aged 23.31 ± 2.26 years (18 females, 11 males) walked at their preferred walking speed on three different surfaces (asphalt, cobbles, grass) in single-task and in two dual-task conditions (manual task-carrying a cup filled with water, cognitive task-subtracting the number 7). A triaxial inertial sensor attached to the lower trunk was used to record trunk acceleration during gait. From 15 strides, sample entropy (SampEn) as an indicator of gait complexity and root mean square (RMS) as an indicator of gait variability were computed. The findings demonstrate that in an outdoor environment, the surfaces significantly impacted only gait variability, not complexity, and that the tasks affected both gait variability and complexity in young healthy adults.
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Affiliation(s)
- Denisa Nohelova
- Department of Natural Sciences in Kinanthropology, Faculty of Physical Culture, Palacký University Olomouc, 771 11 Olomouc, Czech Republic; (L.B.); (Z.S.)
- Laboratory AGEIS, Université Grenoble Alpes, AGEIS, 38000 Grenoble, France;
- LabCom Telecom4Health, Orange Labs & Université Grenoble Alpes, CNRS, Inria, Grenoble INP-UGA, 38000 Grenoble, France
| | - Lucia Bizovska
- Department of Natural Sciences in Kinanthropology, Faculty of Physical Culture, Palacký University Olomouc, 771 11 Olomouc, Czech Republic; (L.B.); (Z.S.)
| | - Nicolas Vuillerme
- Laboratory AGEIS, Université Grenoble Alpes, AGEIS, 38000 Grenoble, France;
- LabCom Telecom4Health, Orange Labs & Université Grenoble Alpes, CNRS, Inria, Grenoble INP-UGA, 38000 Grenoble, France
- Institut Universitaire de France, 75231 Paris, France
| | - Zdenek Svoboda
- Department of Natural Sciences in Kinanthropology, Faculty of Physical Culture, Palacký University Olomouc, 771 11 Olomouc, Czech Republic; (L.B.); (Z.S.)
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Hunter B, Greenhalgh A, Karsten B, Burnley M, Muniz-Pumares D. A non-linear analysis of running in the heavy and severe intensity domains. Eur J Appl Physiol 2021; 121:1297-1313. [PMID: 33580289 DOI: 10.1007/s00421-021-04615-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 01/15/2021] [Indexed: 01/06/2023]
Abstract
PURPOSE Altered movement complexity, indicative of system dysfunction, has been demonstrated with increased running velocity and neuromuscular fatigue. The critical velocity (CV) denotes a metabolic and neuromuscular fatigue threshold. It remains unclear whether changes to complexity during running are coupled with the exercise intensity domain in which it is performed. The purpose of this study was to examine whether movement variability and complexity differ exclusively above the CV intensity during running. METHODS Ten endurance-trained participants ran at 95%, 100%, 105% and 115% CV for 20 min or to task failure, whichever occurred first. Movement at the hip, knee, and ankle were sampled throughout using 3D motion analysis. Complexity of kinematics in the first and last 30 s were quantified using sample entropy (SampEn) and detrended fluctuation analysis (DFA-α). Variability was determined using standard deviation (SD). RESULTS SampEn decreased during all trials in knee flexion/extension and it increased in hip internal/external rotation, whilst DFA-α increased in knee internal/external rotation. SD of ankle plantar/dorsiflexion and inversion/eversion, knee internal/external rotation, and hip flexion/extension and abduction/adduction increased during trials. Hip flexion/extension SampEn values were lowest below CV. DFA-α was lower at higher velocities compared to velocities below CV in ankle plantar/dorsiflexion, hip flexion/extension, hip adduction/abduction, hip internal/external rotation. In hip flexion/extension SD was highest at 115% CV. CONCLUSIONS Changes to kinematic complexity over time are consistent between heavy and severe intensity domains. The findings suggest running above CV results in increased movement complexity and variability, particularly at the hip, during treadmill running.
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Affiliation(s)
- Ben Hunter
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, UK.
| | - Andrew Greenhalgh
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, UK
| | - Bettina Karsten
- European University of Applied Sciences (EUFH), Berlin, Germany
| | - Mark Burnley
- Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, Chatham Maritime, Chatham, UK
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Mahaki M, Mimar R, Sadeghi H, Khaleghi Tazji M, Vieira MF. The effects of general fatigue induced by incremental exercise test and active recovery modes on energy cost, gait variability and stability in male soccer players. J Biomech 2020; 106:109823. [PMID: 32517989 DOI: 10.1016/j.jbiomech.2020.109823] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 04/21/2020] [Accepted: 05/05/2020] [Indexed: 11/21/2022]
Abstract
The aerobic endurance is considered an important physiological capacity of soccer players which is examined by Incremental Exercise Test (IET). However, it is not clear how general fatigue induced by IET influences physiological and biomechanical gait features in soccer players and how players recover optimally at post-IET. Here, the effect of general fatigue induced by IET on energy cost, gait variability and stability in soccer players was investigated. To identify an optimal recovery mode, the effect of walking at Preferred Walking Speed (PWS), running at Individual Ventilation Threshold (IVT) (two active recovery modes), and Rest (a passive recovery mode) on aforementioned features were studied. Nine male players walked 4-min at PWS on a treadmill prior IET (PreT), which was followed by four 4-min walking trials (PosT-0, 1, 2, and 3) with three 4-min recovery intervals (PWS, IVT, or Rest) between them, in three sessions (one for each recovery mode) in a random order. Energy cost, gait variability and stability were examined at PreT (baseline), and at PosT-0, 1, 2, and 3 (intervals of respectively 0-4, 8-12, 16-20, 24-28 min at post-IET). Gait variability was assessed by the standard deviation of trunk angle and gait stability was assessed by the local dynamic stability of trunk angular velocity. Gait stability was not affected by IET, despite increases in gait variability and energy cost. Different from IVT, PWS and Rest recovery modes reduced energy cost at post-IET. Gait variability and energy cost recovered at PosT-1 and PosT-2, suggesting that 8-12 and 16-20 min recovery intervals, respectively, were required for returning to their baselines. No preference for active over passive recovery was found in terms of gait variability and energy cost.
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Affiliation(s)
- Mohammadreza Mahaki
- Faculty of Physical Education and Sport Sciences, Kharazmi University of Tehran, Tehran, Iran; Faculty of Behavioural and Movement Sciences, VU University of Amsterdam, Amsterdam, The Netherlands.
| | - Raghad Mimar
- Faculty of Physical Education and Sport Sciences, Kharazmi University of Tehran, Tehran, Iran
| | - Heydar Sadeghi
- Faculty of Physical Education and Sport Sciences, Kharazmi University of Tehran, Tehran, Iran; Kinesiology Research Center, Kharazmi University of Tehran, Tehran, Iran
| | - Mehdi Khaleghi Tazji
- Faculty of Physical Education and Sport Sciences, Kharazmi University of Tehran, Tehran, Iran
| | - Marcus Fraga Vieira
- Bioengineering and Biomechanics Laboratory, Federal University of Goiás, Goiânia, Brazil
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Svenningsen FP, Pavailler S, Giandolini M, Horvais N, Madeleine P. A narrative review of potential measures of dynamic stability to be used during outdoor locomotion on different surfaces. Sports Biomech 2019; 19:120-140. [PMID: 31456487 DOI: 10.1080/14763141.2019.1642953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Dynamic stability of locomotion plays an important role in running injuries, particularly during trail running where ankle injuries occur frequently. Several studies have investigated dynamic stability of locomotion using wearable accelerometer measurements. However, no study has reviewed how dynamic stability of locomotion is quantified using accelerometry. Therefore, the present review aims to synthetise the methods and findings of studies investigating stability related parameters measured by accelerometry, during locomotion on various surfaces, and among asymptomatic participants. A systematic search of studies associated with locomotion was conducted. Only studies including assessment of dynamic stability parameters based on accelerometry, including at least one group of asymptomatic participants, and conditions that occur during trail running were considered relevant for this review. Consequently, all retrieved studies used a non-obstructive portable accelerometer or an inertial measurement unit. Fifteen studies used a single tri-axial accelerometer placed above the lumbar region allowing outdoor recordings. From trunk accelerations, a combination of index of cycle repeatability and signal dispersion can adequately be used to assess dynamic stability. However, as most studies included indoor conditions, studies addressing the biomechanics of trail running in outdoor conditions are warranted.
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Affiliation(s)
- Frederik P Svenningsen
- Sport Sciences, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark.,AmerSports Innovation and Sport Science Laboratory, Salomon Simplified Stock Company, Annecy, France
| | - Sébastien Pavailler
- AmerSports Innovation and Sport Science Laboratory, Salomon Simplified Stock Company, Annecy, France
| | - Marlène Giandolini
- AmerSports Innovation and Sport Science Laboratory, Salomon Simplified Stock Company, Annecy, France
| | - Nicolas Horvais
- AmerSports Innovation and Sport Science Laboratory, Salomon Simplified Stock Company, Annecy, France
| | - Pascal Madeleine
- Sport Sciences, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
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