Albracht K, Arampatzis A, Baltzopoulos V (2008) Assessment of muscle volume and physiological cross-sectional area of the human triceps surae muscle in vivo. J Biomech 41(10):2211–18. https://doi.org/10.1016/j.jbiomech.2008.04.020

Article  CAS  PubMed  Google Scholar 

AminiAghdam S, Vielemeyer J, Abel R, Müller R (2019) Reactive gait and postural adjustments following the first exposures to (un)expected stepdown. J Biomech 94:130–37. https://doi.org/10.1016/j.jbiomech.2019.07.029

Article  PubMed  Google Scholar 

Arampatzis A, Knicker A, Metzler V, Brüggemann GP (2000) Mechanical Power in Running: A Comparison of Different Approaches. J Biomech 33(4):457–63. https://doi.org/10.1016/S0021-9290(99)00187-6

Article  CAS  PubMed  Google Scholar 

Arampatzis A, Karamanidis K, Stafilidis S, Morey-Klapsing G, DeMonte G, Brüggemann GP (2006) Effect of Different Ankle- and Knee-Joint Positions on Gastrocnemius Medialis Fascicle Length and EMG Activity during Isometric Plantar Flexion. J Biomech 39(10):1891–1902. https://doi.org/10.1016/j.jbiomech.2005.05.010

Article  PubMed  Google Scholar 

Arampatzis A, Kharazi, M, Theodorakis C, Mersmann F, Bohm S (2023) Biarticular Mechanisms of the Gastrocnemii Muscles Enhance Ankle Mechanical Power and Work during Running. Royal Soc Open Sci. https://doi.org/10.1098/rsos.230007

Article  Google Scholar 

Batschelet E (1981) Circular Statistics in Biology. Academic Press, New York

Google Scholar 

Berg WP, Alessio HM, Mills EM, Tong C (1997) Circumstances and Consequences of Falls in Independent Community-Dwelling Older Adults. Age Ageing 26(4):261–68. https://doi.org/10.1093/ageing/26.4.261

Article  CAS  PubMed  Google Scholar 

Bierbaum S, Peper A, Karamanidis K, Arampatzis A (2010) Adaptational Responses in Dynamic Stability during Disturbed Walking in the Elderly. J Biomech 43(12):2362–68. https://doi.org/10.1016/j.jbiomech.2010.04.025

Article  PubMed  Google Scholar 

Bierbaum S, Peper A, Karamanidis K, Arampatzis A (2011) Adaptive Feedback Potential in Dynamic Stability during Disturbed Walking in the Elderly. J Biomech 44(10):1921–26. https://doi.org/10.1016/j.jbiomech.2011.04.027

Article  PubMed  Google Scholar 

Bierbaum S, Peper A, Arampatzis A (2013) Exercise of Mechanisms of Dynamic Stability Improves the Stability State after an Unexpected Gait Perturbation in Elderly. Age 35(5):1905–15. https://doi.org/10.1007/s11357-012-9481-z

Article  PubMed  Google Scholar 

Biewener AA, Daley MA (2007) Unsteady Locomotion: Integrating Muscle Function with Whole Body Dynamics and Neuromuscular Control. J Exp Bio 210(17):2949–60. https://doi.org/10.1242/jeb.005801

Article  Google Scholar 

Biewener AA, Konieczynski DD, Baudinette RV (1998) In Vivo Muscle Force-Length Behavior during Steady-Speed Hopping in Tammar Wallabies. J Exp Biol 201(11):1681–94. https://doi.org/10.1242/jeb.201.11.1681

Article  CAS  PubMed  Google Scholar 

Bobbert MF, Mackay M, Schinkelshoek D, Huijing PA, van Ingen Schenau GJ (1986) Biomechanical Analysis of Drop and Countermovement Jumps. Eur J Appl Physiol Occupat Physiol 54(6):566–73. https://doi.org/10.1007/BF00943342

Article  CAS  Google Scholar 

Bohm S, Mersmann F, Bierbaum S, Dietrich R, Arampatzis A (2012) Cognitive Demand and Predictive Adaptational Responses in Dynamic Stability Control. J Biomech 45(14):2330–36. https://doi.org/10.1016/j.jbiomech.2012.07.009

Article  PubMed  Google Scholar 

Boonkhao L, Puangjan K, Ouengprasert I, Laosupap K, Bootsorn A, Junsiri S, Thongdamrongtham S, Chaikhan S, Pramaya P, Rattanachaikunsopon P (2024) Home Environmental Factors Associated with Falls Among Elderly in Ubon Ratchathani, Thailand. J Multidis Healthc 17(March):1363–73. https://doi.org/10.2147/JMDH.S456128

Article  Google Scholar 

Brüll L, Santuz A, Mersmann F, Bohm S, Swenk M, Adamantios A (2024) Spatiotemporal Modulation of a Common Set of Muscle Synergies during Unpredictable and Predictable Gait Perturbations in Older Adults. J Exp Biol. https://doi.org/10.1242/jeb.247271

Article  PubMed  PubMed Central  Google Scholar 

Catalá M, Woitalla D, Arampatzis A (2016) Reactive but Not Predictive Locomotor Adaptability Is Impaired in Young Parkinson’s Disease Patients. Gait Posture 48:177–82. https://doi.org/10.1016/j.gaitpost.2016.05.008

Article  Google Scholar 

Cleland J (1867) On the Actions of Muscles Passing over More than One Joint. J Anatom Physiol 1(1):85–93

CAS  Google Scholar 

Daley MA (2018) Understanding the Agility of Running Birds: Sensorimotor and Mechanical Factors in Avian Bipedal Locomotion. Integr Comp Biol 58(5):884–93. https://doi.org/10.1093/icb/icy058

Article  PubMed  PubMed Central  Google Scholar 

Daley MA, Biewener AA (2006) Running over Rough Terrain Reveals Limb Control for Intrinsic Stability. Proc Nat Acad Sci United States Am 103(42):15681–86. https://doi.org/10.1073/pnas.0601473103

Article  CAS  Google Scholar 

Daley MA, Felix G, Biewener AA (2007) Running Stability Is Enhanced by a Proximo-Distal Gradient in Joint Neuromechanical Control. J Exp Biol 210(3):383–94. https://doi.org/10.1242/jeb.02668

Article  CAS  PubMed  Google Scholar 

Dick TJM, Biewener AA, Wakeling JM (2017) Comparison of Human Gastrocnemius Forces Predicted by Hill-Type Muscle Models and Estimated from Ultrasound Images. J Exp Biol 220(9):1643–53. https://doi.org/10.1242/jeb.154807

Article  PubMed  PubMed Central  Google Scholar 

Dick Taylor JM, Punith LK, Sawicki GS (2019) Humans falling in holes: adaptations in lower-limb joint mechanics in response to a rapid change in substrate height during human hopping. J Royal Soc Interf. https://doi.org/10.1098/rsif.2019.0292

Article  Google Scholar 

Dick Taylor JM, Clemente CJ, Punith LK, Sawicki GS (2021) Series elasticity facilitates safe plantar flexor muscle-tendon shock absorption during perturbed human hopping. Biol Sci, Proc Royal Soc B. https://doi.org/10.1098/rspb.2021.0201

Book  Google Scholar 

Edgerton VR, Smith JL, Simpson DR (1975) Muscle fibre type populations of human leg muscles. Histochem J 7(3):259–66. https://doi.org/10.1007/BF01003594

Article  CAS  PubMed  Google Scholar 

Epro G, Mierau A, Mc Crum C, Leyendecker M, Brüggemann GP, Karamanidis K (2018) Retention of gait stability improvements over 1.5 years in older adults: effects of perturbation exposure and triceps surae neuromuscular exercise. J Neurophysiol 119(6):2229–40. https://doi.org/10.1152/jn.00513.2017

Article  CAS  PubMed  Google Scholar 

Farris DJ, Sawicki GS (2012) Human Medial Gastrocnemius Force-Velocity Behavior Shifts with Locomotion Speed and Gait. Proc Nat Acad Sci United States Am 109(3):977–82. https://doi.org/10.1073/pnas.1107972109

Article  Google Scholar 

Golyski PR, Sawicki GS (2022) Which Lower Limb Joints Compensate for Destabilizing Energy during Walking in Humans? J Royal Soc Interf. https://doi.org/10.1098/rsif.2022.0024

Article  Google Scholar 

Hak L, Houdijk H, Steenbrink F, Mert A, Van der Wurff P, Beek PJ, Van Dieën JH (2012) Speeding up or Slowing down?: Gait Adaptations to Preserve Gait Stability in Response to Balance Perturbations. Gait Posture 36(2):260–64. https://doi.org/10.1016/j.gaitpost.2012.03.005

Article  PubMed  Google Scholar 

Hamill J, Van Emmerik REA, Heiderscheit BC, Li Li (1999) A Dynamical Systems Approach to Lower Extremity Running Injuries. Clin Biomech 14(5):297–308. https://doi.org/10.1016/S0268-0033(98)90092-4

Article  CAS  Google Scholar 

Herzog W, Abrahamse SK, Henk Keurs EDJ (1990) Theoretical Determination of Force-Length Relations of Intact Human Skeletal Muscles Using the Cross-Bridge Model. Pflügers Archiv Eur J Physiol 416(1–2):113–19. https://doi.org/10.1007/BF00370231

Article  CAS  Google Scholar 

Herzog W, Read LJ, ter Keurs HEDJ (1991) Experimental Determination of Force-Length Relations of Intact Human Gastrocnemius Muscles. Clin Biomech 6(4):230–38. https://doi.org/10.1016/0268-0033(91)90051-Q

Article  CAS  Google Scholar 

Hof AL, Berg JW (1977) Linearity between the Weighted Sum of the EMGs of the Human Triceps Surae and the Total Torque. J Biomech 10(9):529–39. https://doi.org/10.1016/0021-9290(77)90033-1

Article  CAS