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Age effect on fatigue-induced limb acceleration as a consequence of high-level sustained submaximal contraction

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Abstract

In reference to electromyographic measurement, the study was conducted to reassess differences in the behavior of fatigue-related neuromuscular function between young and elderly humans with limb acceleration (LA). Fourteen young and fourteen elderly subjects performed sustained index abduction at 75% of their maximal voluntary contractions (MVC) until task failure. Measures of neuromuscular function, including temporal/spectral features of muscle activity of the first dorsal interosseous (FDI) and LA of the index and hand, were monitored. The results showed a manifest fatigue-induced increase in LA of the index in the elderly group, but not in the young group. In contrast, only the young group developed a significant increase in amplitude of the electromyography (EMG) until task failure. Spectral analyses of LA in the index reflected marked age-dependent reorganization following muscle fatigue, with a greater reduction of relative spectral amplitude of LA in the range of 20–40 Hz, but a lesser reduction in coherence between EMG and LA in the elderly group. In line with fatigue-associated restructuring of LA, the mechanical coupling of the metacarpophalangeal joint was more severely undermined in the elderly group than in the young group. The present study manifested an age-related difference in the relative contributions of neural versus mechanical factors to muscle fatigue. Subsequent to a high-level sustained submaximal isometric contraction, a predominant mechanical failure of the musculotendon complex in the elderly was featured with LA, whereas EMG measurement characterized prevailing impairment of neuromuscular propagation in the young.

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Acknowledgments

This research was supported by a grant from the National Science Council, R.O.C., under Grant No. NSC-92-2314-B-006-035.

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Authors and Affiliations

  1. Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, 701, Taiwan

    Chien-Ting Huang & Ing-Shiou Hwang

  2. Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, 701, Taiwan

    Ing-Shiou Hwang

  3. Department of Electrical Engineering, College of Electrical Engineering and Computer Science, National Cheng Kung University, Tainan, 701, Taiwan

    Chien-Chun Huang & Ming-Shing Young

  4. Department of Physical Therapy and Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, 701, Taiwan

    Ing-Shiou Hwang

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  1. Chien-Ting Huang
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  2. Chien-Chun Huang
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  4. Ing-Shiou Hwang
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Correspondence to Ing-Shiou Hwang.

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Huang, CT., Huang, CC., Young, MS. et al. Age effect on fatigue-induced limb acceleration as a consequence of high-level sustained submaximal contraction. Eur J Appl Physiol 100, 675–683 (2007). https://doi.org/10.1007/s00421-007-0460-5

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