Neuromuscular dysfunction following eccentric exercise

Saxton, John, Clarkson, Priscilla, James, Robert, Miles, Mary, Westerfer, Michael, Clark, Sean and Donnelly, Alan (1995) Neuromuscular dysfunction following eccentric exercise. Medicine and Science in Sports and Exercise, 27 (8). pp. 1185-1193. ISSN 0195-9131

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Abstract

This study examined the effects of exercise-induced muscle damage on tremor and proprioception components of neuromuscular function. Six male and six female volunteers (aged 18-30 yr) performed 50 maximal eccentric muscle actions using the forearm flexors of the nondominant arm. Forearm flexor tremor and perception of voluntary force and joint position were monitored to assess changes in neuromuscular function. Data were analyzed using REANOVA. Serum creatine kinase activity increased from a baseline value of 68 +/- 13 IU.l-1 to 2849 +/- 852 IU.l-1 5 d after exercise (P < 0.05). This was accompanied by prolonged impaired joint range of motion (P < 0.01) and reduced maximum strength (P < 0.01). Muscle soreness peaked 3 d postexercise (P < 0.01; Wilcoxon test). Tremor amplitude was increased (P < 0.01) until 48 h after exercise, whereas the power frequency spectrum was unaffected. Perception of joint position at elbow angles of 1.57 rad (P < 0.01) and 2.09 rad (P < 0.05) and perception of force (P < 0.01) were significantly impaired when the control arm acted as the reference. Joint positions were more accurately reproduced when the experimental arm acted as its own reference. The increase in tremor amplitude and loss of proprioceptive function in the days after damage-inducing eccentric exercise suggest significant impairment of neuromuscular function.

Item Type:	Article
Uncontrolled Keywords:	Physiological tremor, proprioception, exercise-induced muscle damage
Subjects:	B100 Anatomy, Physiology and Pathology
Department:	Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User:	Prof John Saxton
Date Deposited:	01 Mar 2016 14:39
Last Modified:	12 Oct 2019 15:28
URI:	http://nrl.northumbria.ac.uk/id/eprint/26250

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