Adaptations in maximal motor unit discharge rate to strength training in young and older adults

被引:132
作者
Patten, C
Kamen, G
Rowland, DM
机构
[1] VA Palo Alto Hlth Care Syst, Rehabil Res & Dev Ctr, Palo Alto, CA 94304 USA
[2] Univ Massachusetts, Dept Exercise Sci, Amherst, MA 01003 USA
关键词
aging; motor unit; neural adaptation; strength;
D O I
10.1002/mus.1038
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Six young (mean = 23 years) and 6 older (mean = 76 years) adults participated in isometric resistance training 5 days/week for 6 weeks. The task involved isometric fifth finger abduction. Maximal motor unit discharge rates (MUDRs) were obtained from the abductor digiti minimi of each hand at 0, 2, 14, and 42 days of training using a quadrifilar needle electrode and automatic spike recognition software. In agreement with previous findings, maximal MUDR at baseline was significantly lower in older adults (P < 0.001), averaging 51.5 (+/-17.13) Hz in young and 43.3 (+/-14.88) Hz in older adults. In response to resistance training, maximal Voluntary force increased 25% in young and 33% in older subjects (P < 0.001). Maximal MUDR increased significantly (11% young, 23% older) on day 2 [F(3,36) = 2.58, P < 0.05], but in older subjects returned to baseline levels thereafter. These adaptations in abductor digiti minimi MUDR suggest a two-part response to strengthening fifth finger abduction: early disinhibition followed by altered MU activation. (C) 2001 John Wiley & Sons, Inc.
引用
收藏
页码:542 / 550
页数:9
相关论文
共 38 条
  • [1] Early phase adaptations of muscle use and strength to isokinetic training
    Akima, H
    Takahashi, H
    Kuno, SY
    Masuda, K
    Masuda, T
    Shimojo, H
    Anno, I
    Itai, Y
    Katsuta, S
    [J]. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 1999, 31 (04) : 588 - 594
  • [2] REPETITIVE DOUBLETS IN HUMAN FLEXOR CARPI RADIALIS MUSCLE
    BAWA, P
    CALANCIE, B
    [J]. JOURNAL OF PHYSIOLOGY-LONDON, 1983, 339 (JUN): : 123 - 132
  • [3] MOTOR-UNIT DISCHARGE RATES IN MAXIMAL VOLUNTARY CONTRACTIONS OF 3 HUMAN MUSCLES
    BELLEMARE, F
    WOODS, JJ
    JOHANSSON, R
    BIGLANDRITCHIE, B
    [J]. JOURNAL OF NEUROPHYSIOLOGY, 1983, 50 (06) : 1380 - 1392
  • [4] AN EFFICIENT ALGORITHM FOR SPECTRAL-ANALYSIS OF HEART-RATE-VARIABILITY
    BERGER, RD
    AKSELROD, S
    GORDON, D
    COHEN, RJ
    [J]. IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, 1986, 33 (09) : 900 - 904
  • [5] CHANGES IN MOTONEURON FIRING RATES DURING SUSTAINED MAXIMAL VOLUNTARY CONTRACTIONS
    BIGLANDRITCHIE, B
    JOHANSSON, R
    LIPPOLD, OCJ
    SMITH, S
    WOODS, JJ
    [J]. JOURNAL OF PHYSIOLOGY-LONDON, 1983, 340 (JUL): : 335 - 346
  • [6] ADAPTATIONS IN COACTIVATION AFTER ISOMETRIC RESISTANCE TRAINING
    CAROLAN, B
    CAFARELLI, E
    [J]. JOURNAL OF APPLIED PHYSIOLOGY, 1992, 73 (03) : 911 - 917
  • [7] THE MEASUREMENT OF HANDEDNESS
    CHAPMAN, LJ
    CHAPMAN, JP
    [J]. BRAIN AND COGNITION, 1987, 6 (02) : 175 - 183
  • [8] CLAMANN HP, 1990, CHANGES OCCUR MOTOR, P239
  • [9] ADAPTATION OF MECHANICAL-PROPERTIES OF MUSCLE TO HIGH FORCE TRAINING IN MAN
    DAVIES, CTM
    DOOLEY, P
    MCDONAGH, MJN
    WHITE, MJ
    [J]. JOURNAL OF PHYSIOLOGY-LONDON, 1985, 365 (AUG): : 277 - 284
  • [10] Age-related changes in the twitch contractile properties of human thenar motor units
    Doherty, TJ
    Brown, WF
    [J]. JOURNAL OF APPLIED PHYSIOLOGY, 1997, 82 (01) : 93 - 101