The Changes of Trunk Motion Rhythm and Spinal Loading During Trunk Flexion and Extension Motions Caused by Lumbar Muscle Fatigue

Objective:This study sought to determine the effects of trunk-muscle fatigue and blood lactic acid elevation on static and dynamic balance.Intervention:Fatigue was induced by an isokinetic protocol, and static and dynamic balance were assessed during bilateral stance using a Kinesthetic Ability Trainer. Subjects participated in a fatigue protocol in which continuous concentric movements at 60°/s were performed until the torque output for both trunk flexion and extension dropped below 25% of the calculated peak torque for 3 consecutive movements.Measures:Before and immediately after the fatigue protocol, blood lactic acid measurements and static- and dynamic-balance measurements were recorded.Results:An increase in lactic acid levels was detected in all subjects. According to a dependent-samples t test, significant differences in balance and lactic acid values were found after the fatigue protocol. There was no correlation between lactic acid accumulation (change between prefatigue and postfatigue levels) and balance-score differences.Conclusion:Trunk-muscle fatigue has an adverse effect on static and dynamic balance.

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The effect of task asymmetry, age and gender on dynamic trunk motion characteristics during repetitive trunk flexion and extension in a large normal population

IEEE Transactions on Rehabilitation Engineering ◽

10.1109/86.331563 ◽

1994 ◽

Vol 2 (3) ◽

pp. 137-146 ◽

Cited By ~ 14

Author(s):

W.S. Marras ◽

M. Parnianpour ◽

J.-Y.Y. Kim ◽

S.A. Ferguson ◽

R.R. Crowell ◽

...

Keyword(s):

Normal Population ◽

Trunk Flexion ◽

Age And Gender ◽

Trunk Motion ◽

And Gender ◽

Motion Characteristics ◽

Flexion And Extension

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Immediate Effect of Trunk Flexion And Extension Isometric Exercise Using An External Compression Device On Electromyography of The Hip Extensor And Trunk Range of Motion Of Healthy Subjects

10.21203/rs.3.rs-1179826/v1 ◽

2021 ◽

Author(s):

Tian-Zong Huang ◽

Suhn Yeop Kim

Keyword(s):

Range Of Motion ◽

Muscle Fatigue ◽

Healthy Subjects ◽

Isometric Exercise ◽

Trunk Flexion ◽

Endurance Test ◽

External Compression ◽

Compression Device ◽

Onset Timing ◽

Flexion And Extension

Abstract Background: Low back pain (LBP) is a very common symptom experienced by individuals across all age groups. Previous study established that using a device known as Active Therapeutic Movement version 2 (ATM®2) has been developed to improve pain and joint range of motion (ROM) in patients with LBP. However, no study has examined the physiological change in the muscle through ATM®2-based exercise thus far. This study aimed to determine the immediate effects of ATM®2 exercise on the contraction timing, back extension endurance, muscle fatigue, and trunk ROM of lumbar and lower limb muscles in healthy subjects.Methods: Thirty-six healthy subjects (mean age=23.16±2.3) volunteered to participate in this study. Subjects were instructed to perform ROM test using sit and reach test, back extensor endurance test using Biering-Sorensen test, erector spinae (ES), lumbar multifidus (LM) fatigue and onset time of Gluteus maximus (GM) in prone hip extension using electromyography before and after trunk flexion and extension isometric exercises.Results: The ROM in trunk flexion showed a significant increase by 7.9% after exercise compared to that before exercise (p<0.05). Relative GM contraction onset timing significantly decreased after exercise (p<0.05). The result of the Sorensen test after exercise showed a trend of increase in duration time. Muscle fatigue in the LM, however, showed a significant increase (p<0.05), whereas muscle fatigue in the ES was reduced without statistical significance.Conclusions: The results base on this study showed a significant increase in the trunk ROM after trunk flexion and extension isometric exercise using an external compression device, while the relative contraction onset timing in the GM significantly reduced. Furthermore, the muscle endurance test after exercise showed a trend of increase in the duration time with a decreasing trend in muscle fatigue in the ES. Exercise based on ATM®2 is an effective exercise protocol with an effect on biomechanics of healthy subjects. This exercise may be suitable in clinical practice for patients with LBP, for which long-term effects can be expected.

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Neuromuscular Control and Active Trunk Stiffness during Isometric Flexion and Extension

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/154193120504901415 ◽

2005 ◽

Vol 49 (14) ◽

pp. 1334-1338

Author(s):

Kevin Granata ◽

Patrick Lee

Keyword(s):

Neuromuscular Control ◽

Random Force ◽

Muscle Stiffness ◽

Spinal Stability ◽

Trunk Flexion ◽

Trunk Motion ◽

Materials Handling ◽

Motion Data ◽

Trunk Movements ◽

Flexion And Extension

Pushing and pulling tasks account for 20% of low-back injury claims. Torso flexion necessary for pushing exertions requires different muscle recruitment than for extension exertions typical of lifting tasks. These differences in recruitment and control may influence spinal stability and associated risk of injury. Active muscle stiffness is considered the primary stabilizing mechanism for spinal stability. Therefore, active trunk stiffness was recorded while subjects generated upright isometric trunk flexion and extension exertions against an isotonic preload. Small pseudo-random force disturbances were superimposed on the preloads causing small amplitude trunk movements. Trunk stiffness was computed from systems identification of the measured force and trunk motion data. Results demonstrated significantly greater stiffness during flexion exertions as compared to extension exertions. EMG data suggest this difference was due to increased co-contraction during the flexion exertions. These behaviours were attributed to the need to augment neuromuscular control of spinal stability during pushing tasks. Keywords: Spine; Co-contraction; Push; Manual Materials Handling; Biomechanics

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Interrelated hypoalgesia, creep, and muscle fatigue following a repetitive trunk flexion exposure

Journal of Electromyography and Kinesiology ◽

10.1016/j.jelekin.2021.102531 ◽

2021 ◽

Vol 57 ◽

pp. 102531

Author(s):

Daniel Viggiani ◽

Jack P. Callaghan

Keyword(s):

Muscle Fatigue ◽

Trunk Flexion

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Evaluation of Strength and Irradiated Movement Pattern Resulting from Trunk Motions of the Proprioceptive Neuromuscular Facilitation

Rehabilitation Research and Practice ◽

10.1155/2012/281937 ◽

2012 ◽

Vol 2012 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Luciana Bahia Gontijo ◽

Polianna Delfino Pereira ◽

Camila Danielle Cunha Neves ◽

Ana Paula Santos ◽

Dionis de Castro Dutra Machado ◽

...

Keyword(s):

Plantar Flexion ◽

Movement Pattern ◽

Lower Limbs ◽

Trunk Flexion ◽

Average Force ◽

Proprioceptive Neuromuscular Facilitation ◽

Muscular Activation ◽

Flexion And Extension ◽

Regional Muscle ◽

Dorsal Flexion

Introduction. The proprioceptive neuromuscular facilitation (PNF) is a physiotherapeutic concept based on muscle and joint proprioceptive stimulation. Among its principles, the irradiation is the reaction of the distinct regional muscle contractions to the position of the application of the motions.Objective. To investigate the presence of irradiated dorsiflexion and plantar flexion and the existing strength generated by them during application of PNF trunk motions.Methods. The study was conducted with 30 sedentary and female volunteers, the PNF motions of trunk flexion, and extension with the foot (right and left) positioned in a developed equipment coupled to the load cell, which measured the strength irradiated in Newton.Results. Most of the volunteers irradiated dorsal flexion in the performance of the flexion and plantar flexion during the extension motion, both presenting an average force of 8.942 N and 10.193 N, respectively.Conclusion. The distal irradiation in lower limbs became evident, reinforcing the therapeutic actions to the PNF indirect muscular activation.

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