TAILIEUCHUNG - Báo cáo hóa học: "Entropy of balance - some recent results"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Entropy of balance - some recent results | Borg and Laxảback Journal of NeuroEngineering and Rehabilitation 2010 7 38 http content 7 1 38 JNER JOURNAL OF NEUROENGINEERING AND REHABILITATION RESEARCH Open Access Entropy of balance - some recent results Frank G Borg Gerd Laxẵback Abstract Background Entropy when applied to biological signals is expected to reflect the state of the biological system. However the physiological interpretation of the entropy is not always straightforward. When should high entropy be interpreted as a healthy sign and when as marker of deteriorating health We address this question for the particular case of human standing balance and the Center of Pressure data. Methods We have measured and analyzed balance data of 136 participants young n 45 elderly n 91 comprising in all 1085 trials and calculated the Sample Entropy SampEn for medio-lateral M L and anterior-posterior A P Center of Pressure COP together with the Hurst self-similariy ss exponent a using Detrended Fluctuation Analysis DFA . The COP was measured with a force plate in eight 30 seconds trials with eyes closed eyes open foam self-perturbation and nudge conditions. Results 1 There is a significant difference in SampEn for the A P-direction between the elderly and the younger groups Old young. 2 For the elderly we have in general A P M L. 3 For the younger group there was no significant A P-M L difference with the exception for the nudge trials where we had the reverse situation A P M L. 4 For the elderly we have Eyes Closed Eyes Open. 5 In case of the Hurst ss-exponent we have for the elderly M L A P. Conclusions These results seem to be require some modifications of the more or less established attentionconstraint interpretation of entropy. This holds that higher entropy correlates with a more automatic and a less constrained mode of balance control and that a higher entropy reflects in this sense a more efficient balancing. Background The attention-constraint interpretation ACI There is a .

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