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Titolo:
EFFECTS OF STIMULATION INTENSITY ON THE PHYSIOLOGICAL-RESPONSES OF HUMAN MOTOR UNITS
Autore:
BINDERMACLEOD SA; HALDEN EE; JUNGLES KA;
Indirizzi:
UNIV DELAWARE,DEPT PHYS THERAPY,315 MCKINLY LAB NEWARK DE 19716
Titolo Testata:
Medicine and science in sports and exercise
fascicolo: 4, volume: 27, anno: 1995,
pagine: 556 - 565
SICI:
0195-9131(1995)27:4<556:EOSIOT>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRICAL-STIMULATION; MUSCLE FATIGUE; EXCITATION-FREQUENCY; RECRUITMENT ORDER; VOLUNTARY; CONTRACTIONS; ACTIVATION; STRENGTH; FATIGABILITY; EXERCISE;
Keywords:
RECRUITMENT ORDER; TRANSCUTANEOUS NEUROMUSCULAR ELECTRICAL STIMULATION; FUNCTIONAL ELECTRICAL STIMULATION; FORCE FREQUENCY RELATIONSHIP; SKELETAL MUSCLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
S.A. Bindermacleod et al., "EFFECTS OF STIMULATION INTENSITY ON THE PHYSIOLOGICAL-RESPONSES OF HUMAN MOTOR UNITS", Medicine and science in sports and exercise, 27(4), 1995, pp. 556-565

Abstract

Quadriceps femoris muscles were studied in 50 healthy subjects to determine the physiological responses of the motor units recruited al different force levels during transcutaneous electrical stimulation. During one set of experiments force-frequency relationships were compared at stimulation intensities that produced tetanic contraction of 20%, 50%, or 80% of the maximum voluntary isometric contraction (MVC). No differences in the normalized force-frequency relationship were observedbetween the 20% and 50% of MVC conditions and only a slight shift to the left was observed at 80% of MVC. The other set of experiments measured the responses to electrically elicited fatigue tests using frequencies of 20, 40, or 60 pps and, at each frequency, intensities that produced 20% or 50% of MVC. Fatigue was greater for the 50% than 20% MVCforce conditions. Within each force level fatigue increased with increasing frequency. However, though the differences in the level of recruitment needed to produce the two forces varied for each frequency, the differences in the amount of fatigue produced at each force did not vary between the three stimulation frequencies. This suggests that thefatigue characteristics of the recruited motor units were similar at all intensities tested. We posit, therefore, that the physiological recruitment order during transcutaneons electrical stimulation is less orderly than previously suggested.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 07:57:23