Electromyographic response of the trunk muscles to postural perturbation in sitting subjects

Zedka, Milan; Kumar, Shrawan; Narayan, Yogesh

doi:10.1016/s1050-6411(96)00033-8

Cited by 53 publications

(40 citation statements)

References 20 publications

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“…The decreased muscle activation with anticipation was in accordance with earlier studies where the peak muscle activation amplitudes were approximately 70% greater during unexpected conditions (Lavender et al 1989;Marras et al 1987). Expectation can modify trunk muscle activation in certain conditions of sudden upper limb (Lavender et al 1989) and trunk (Thomas et al 1998) loading, but does not seem to have an effect on trunk muscle activation during certain postural perturbations (Granata et al 2001;Zedka et al 1998). …”

Section: Discussionsupporting

confidence: 90%

“…In sudden trunk loading, expectation increased trunk muscle activity prior to the load onset and decreased peak trunk muscle activity after the load onset (Thomas et al 1998). However, the equilibrium reactions of seated subjects were not affected by expectation or vision (Zedka et al 1998) and expectation did not change the preparatory muscle activity levels in an experiment by Granata et al (2001). Thus, there appears to be variation in the effect of expectation on trunk muscle activity during sudden loading.…”

Section: Introductionmentioning

confidence: 84%

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Paraspinal muscle responses during sudden upper limb loading

Leinonen

Kankaanpää

Hänninen

et al. 2002

European Journal of Applied Physiology

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The paraspinal muscle responses for unexpected and expected upper limb loading were investigated by surface EMG of 20 healthy volunteers. The simultaneous trunk and hand accelerations with paraspinal, biceps brachii and soleus muscles EMG were measured in four subjects. A short-latency response of approximately 50 ms was observed in paraspinal muscles. The latency was approximately 3 ms shorter (P = 0.017) during "expected" trials on average and the latency shortened during the first three expected trials (P = 0.02). Anticipation also decreased the magnitude of the response (P < 0.05). Trunk movement initiated approximately 35 ms and approximately 50 ms after the impact of the load at T6 and T12 levels, respectively. In conclusion, visual expectation shortens the latency and decreases the magnitude of the paraspinal muscle response to sudden upper limb loading. Also, the trial repetition has an effect on reflex latency if visual information is available. These results indicate that anticipation modulates the reflex control of paraspinal muscles, which may be significant in understanding spinal function.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 84%

Paraspinal muscle responses during sudden upper limb loading

Leinonen

Kankaanpää

Hänninen

et al. 2002

European Journal of Applied Physiology

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“…Genthon et al 32) reported that in a study of stroke patients, biomechanical evaluation showed that cooperative contractions of the abdominalis and latissimus dorsi, which control flexion and extension of trunk, were damaged more than of the internal and external oblique abdominal muscles, which control lateral movement (p<0.05) 32,33) . Van Nes et al 34) reported that forward-backward balance control in the sitting position was compensated by the lower extremities, and right-left balance control in the sitting position was solely dependent on trunk control.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Dual Motor Task Training while Sitting on Trunk Control Ability and Balance of Patients with Chronic Stroke

Lee

Shin

et al. 2012

J Phys Ther Sci

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Abstract.[Purpose] The purpose of this study was to investigate the effect on chronic stroke patient's trunk control and dynamic balance ability in the sitting position of a dual motor task training program combined with a conventional training program.[Subjects] Twenty-eight subjects after twelve months post stroke participated.[Methods] The subjects were randomly divided into two groups: a dual motor task training group (n=14) and a control group (n=14). Both groups performed the conventional exercise program for 60 minutes per day, 5 times a week for six weeks. The dual motor task training group also performed dual motor task training in the sitting position for 30 minutes per day, 3 times a week for six weeks at a separate place from the control group.[Results] The dual motor task training group showed significant improvements in trunk control ability, and dynamic balance in the sitting position.[Conclusion] Dual motor task training combined with a conventional exercise program improves trunk control ability and sitting balance. These results suggest that dual motor task training is feasible and beneficial for individuals with chronic stroke.

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“…60 Several studies investigating muscle latency times for voluntary and unexpected movements have been conducted on the knee, 16,59,66,67 ankle, 6,25,34,44 and trunk. 13,22,24,68 For these joints, temporal muscle recruitment patterns have been examined in a feedback as well as in a feedforward manner. However, research on recruitment patterns and timing of muscle activity in the shoulder is limited.…”

mentioning

confidence: 99%

Scapular Muscle Recruitment Pattern: Electromyographic Response of the Trapezius Muscle to Sudden Shoulder Movement Before and After a Fatiguing Exercise

Cools¹,

Witvrouw²,

Clercq³

et al. 2002

J Orthop Sports Phys Ther

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4Study Design: Test-retest reliability study and single-group repeated measures design. Objectives: To evaluate the muscle latency times of the 3 portions of the trapezius muscle to a sudden arm movement in normal shoulders and to determine if this recruitment pattern is altered as a result of fatigue. Background: It has been suggested that shoulder impingement may be related to altered muscle activity and muscle fatigue in the scapular stabilizers. Fatigue-induced changes in latency times of the trapezius might influence scapular stability. Methods and Measures: Muscle latency times were investigated in 30 healthy shoulders with surface electromyography. Muscle activity was measured in all 3 sections of the trapezius and the middle deltoid muscle during a sudden downward falling movement of the arm. Subsequently the shoulder was fatigued on an isokinetic dynamometer, after which muscle latency time measurement was repeated. Results: ANOVA for repeated measures revealed significant differences in latency times (P Ͻ 0.05) among the 4 muscles of interest. Although there were no significant differences among the 3 sections of the trapezius muscle, they all were recruited after the initialization of the deltoid muscle. The recruitment order of the shoulder muscles did not change with muscle fatigue. However, after fatigue, muscle responses were significantly slower in all muscles except for the lower trapezius (P Ͻ 0.05). Sciences and Physiotherapy, De Pintelaan 185, 6K3, B9000 Ghent, Conclusions: There is a specific recruitment sequence in the shoulder muscles in response to a sudden arm movement characterized by initial activation of the middle deltoid muscle and followed by simultaneous contraction of all 3 sections of the trapezius. This muscle activation pattern is delayed but not altered with fatigue.

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Electromyographic response of the trunk muscles to postural perturbation in sitting subjects

Cited by 53 publications

References 20 publications

Paraspinal muscle responses during sudden upper limb loading

Paraspinal muscle responses during sudden upper limb loading

The Effect of Dual Motor Task Training while Sitting on Trunk Control Ability and Balance of Patients with Chronic Stroke

Scapular Muscle Recruitment Pattern: Electromyographic Response of the Trapezius Muscle to Sudden Shoulder Movement Before and After a Fatiguing Exercise

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