The Journal of Practical Medicine ›› 2024, Vol. 40 ›› Issue (10): 1376-1381.doi: 10.3969/j.issn.1006-5725.2024.10.008

• Clinical Research • Previous Articles     Next Articles

Characterization of muscle synergy during sitting and standing in older adults with hallux valgus

Yanyan LIU1,Lei QIAN2,Ruiping LIU3,Jun OUYANG2(),Gang. LIU1()   

  1. *.Department of Rehabilitation Medicine,Nanfang Hospital,Southern Medical University,Guangzhou 510515,China
  • Received:2023-12-29 Online:2024-05-25 Published:2024-05-21
  • Contact: Jun OUYANG,Gang. LIU E-mail:jouyang@126.com;lg2781@smu.edu.cn

Abstract:

Objective To analyze changes in neuromuscular control during sit-to-stand (STS) in older adults with hallux valgus (HV) through muscle synergy, and thus to explore the effect of falls in older adults with HV. Methods Four groups of subjects were included in this study, 13 young controls (YC); 12 young HVgroup (HVY); 14 healthy elderly controls (EC); and 15 elderly HV group (HVE). All subjects completed the STS maneuver in an armless chair, and EMG data were integrated using non-negative matrix factorization to compare muscle synergies in the YC, HVY, EC, and HVE groups; plantar pressures (COP), ground reaction forces (GRF), and fall scores (FES-I) were collected. Results Compared with YC group, HVY, EC, and HVE groups had lower relative activation amplitude of abductor hallucis and lateral gastrocnemius in STS preparation phase; meanwhile, EC and HVE groups needed more muscle activation to maintain stability of trunk and foot-ankle joints in STS stabilization phase; and HVE group needed more co-contractions of thigh muscles to maintain stability of the knee joint. The COP, FES-I of HVE group was higher than that of the other groups (P < 0.05). Conclusion In STS, healthy older adults and older adults with HV required more muscle activation to maintain trunk and ankle stability; older adults with HV required more co-contraction of the thigh muscles to maintain knee stability; in addition to this, older adults with HV were more prone to falls.

Key words: elderly hallux valgus, muscle synergy, sit-to-stand exercise, nonnegative matrix factorization

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