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Methods Inf Med 1997; 36(04/05): 372-375
DOI: 10.1055/s-0038-1636852
Original Article
Schattauer GmbH

Cardiovascular and Metabolic Responses to Electrical Stimulation-Induced Leg Exercise in Spinal Cord Injury

A. J. Thomas
1   Rehabilitation Research Centre, The University of Sydney, Sydney, Australia
,
G. M. Davis
1   Rehabilitation Research Centre, The University of Sydney, Sydney, Australia
,
J. R. Sutton
1   Rehabilitation Research Centre, The University of Sydney, Sydney, Australia
› Author Affiliations
Further Information

Publication History

Publication Date:
19 February 2018 (online)

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Abstract:

Electrical stimulation-induced leg muscle contractions provide a useful model for examining the role of leg muscle neural afferents during low-intensity exercise in persons with spinal cord-injury and their able-bodied cohorts. Eight persons with paraplegia (SCI) and 8 non-disabled subjects (CONTROL) performed passive knee flexion/extension (PAS), electrical stimulation-induced knee flexion/extension (ES) and voluntary knee flexion/extension (VOL) on an isokinetic dynamometer. In CONTROLS, exercise heart rate was significantly increased during ES (94 ± 6 bpm) and VOL (85 ± 4 bpm) over PAS (69 ± 4 bpm), but no changes were observed in SCI individuals. Stroke volume was significantly augmented in SCI during ES (59 ± 5 ml) compared to PAS (46 ± 4 ml). The results of this study suggest that, in able-bodied humans, Group III and IV leg muscle afferents contribute to increased cardiac output during exercise primarily via augmented heart rate. In contrast, SCI achieve raised cardiac output during ES leg exercise via increased venous return in the absence of any change in heart rate.

Keywords:

Exercise - Spinal Cord Injury - Cardiovascular Responses
 

  • References

  • 1 Adams L, Garlick J, Guz A, Murphy K, Semple SJG. Is the voluntary control of exercise in man necessary for the ventilatory response?. J Physiol 1984; 355: 71-83.
    CrossrefPubMedGoogle Scholar
  • 2 Adams L. et al. The role of spinal cord transmission in the ventilatory response to exercise in man. J Physiol 1984; 355: 85-97.
    CrossrefPubMedGoogle Scholar
  • 3 Scelsi R, Marchetti C, Poggi P, Lotta S, Lom-mi G. Muscle fiber type morphology and distribution in paraplegic patients with traumatic cord lesion. Acta Neuropathologica 1982; 57: 243-8.
    CrossrefPubMedGoogle Scholar
  • 4 Brice A. et al. Ventilatory and PaCO, responses to voluntary and electrically induced leg exercise. J Appl Physiol 1988; 64: 218-25.
    PubMedGoogle Scholar
  • 5 Brice A. et al. Is the hyperpnoea of muscular contractions critically dependent on spinal afferents?. J Appl Physiol 1988; 64: 226-33.
    CrossrefPubMedGoogle Scholar
  • 6 Nakazono Y, Miyamoto Y. Cardiorespiratory dynamics in men in response to passive work. Japan J Physiol 1985; 35: 33-43.
    CrossrefPubMedGoogle Scholar
  • 7 Brown D. et al. Ventilatory response of spinal cord-lesioned subjects to electrically induced exercise. J Appl Physiol 1990; 68: 2312-21.
    CrossrefPubMedGoogle Scholar
  • 8 Figoni SF. et al. Acute haemodynamic responses of spinal cord injured individuals to functional neuromuscular stimulation-induced knee extension exercise. J Rehabil Res Develop 1991; 28: 9-18.
    CrossrefPubMedGoogle Scholar
  • 9 Glaser RM. et al. Central hemodynamic responses to lower limb FNS. Proc 9th Ann Internat Conf IEEE Eng Med Biol Soc 1987; 01: 615-7.
    PubMedGoogle Scholar
  • 10 Davies CTM, Starkie DW. The pressor response to voluntary and electrically evoked isometric contractions in man. Eur J Appl Physiol 1985; 53: 359-63.
    CrossrefPubMedGoogle Scholar
  • 11 Waldrop TG, Rybicki KJ, Kaufman MP. Chemical activation of group I and II muscle afferents has no cardiorespiratory effects. J Appl Physiol: Respirat, Environ Exer Physiol 1984; 56: 1223-8.
    PubMedGoogle Scholar