Summary
The effect of moderate exercise on the Achilles tendon reflex half-relaxation time (ART) was observed in 28 hypothyroid, 35 euthyroid, and 20 hyperthyroid subjects of comparable age and sex. Both the resting ART and the decrease after exercise (δART) were longer in hypothyroid patients and shorter in hyperthyroid patients as compared to the euthyroid group. δART was strongly related to the resting ART rather than to the free thyroxine index. In four hypothyroid subjects, the half-time of recovery of the ART after exercise was similar, approx. 24 min. Insulin-hypoglycaemia in eight resting endocrine patients also caused a fall in ART similar to the post-exercise δART in the same patients. A possible catecholamine effect is indicated by the smaller post-exercise δART in nine hypertensive patients receiving chronic propranolol treatment, 320 mg daily, than that of a control group matched for age, sex, and resting ART.
These studies suggest that submaximal exercise largely removes the differential effect of thyroid status on skeletal muscle contractility as measured indirectly by the ART. The effects of exercise and induced insulin-hypoglycaemia on δART may be mediated in part by endogenous catecholamines.
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References
Becker DV (1978) Metabolic indices. In: Werner SC, Ingbar SH (eds) The thyroid. Harper & Row, London, pp 356–358
Bowman WC, Raper C (1967) Adrenotropic receptors in skeletal muscle. Ann NY Acad Sci 139: 741–753
Buccino RA, Spann JF, Pool PE, Sonnenblick EH, Braunwald E (1967) Influence of the thyroid state on the intrinsic contractile properties and the energy stores of the myocardium. J Clin Invest 46: 1669–1682
Caswell AH, Baker SP, Boyd H, Potter LT, Garcia M (1978) Β-Adrenergic receptor and adenylate cyclase in transverse tubules of skeletal muscle. J Biol Chem 253: 3049–3054
Cheah JS, Tan BY (1970) The effect of exercise on the Achilles tendon reflex time. Med J Austr 1: 1050–1051
Dry J, Pradalier A, Leynadier F (1975a) Modifications du réflexogramme achilléen au cours d'une épreuve d'effort musculaire. Thérapie 30: 799–802
Dry J, Laynadier F, Pradalier A (1975b) Action de l'isoprénaline et de la terbutaline sur le réflexogramme achilléen. Therapie 30: 803–808
Gold HK, Spann JF, Braunwald E (1970) Effect of alteration in the thyroid state on the intrinsic contractile properties of isolated rat skeletal muscle. J Clin Invest 49: 849–854
Ianuzzo D, Patel P, Chen V, O'Brien P, Williams C (1977) Thyroidal trophic influence on skeletal muscle myosin. Nature 270: 74–76
Ibbertson HK, Gluckman PD, Croxson MS, Strang LJW (1974) Goitre and cretinism in the Himalayas. A reassessment. In: Dunn JT, Medeiros-Neto GA (eds) Endemic goitre and cretinism: continuing threats to world health. PAHO Scientific Publication 292. WHO, Washington DC
Nuki G, Bayliss RIS (1968) The Achilles tendon reflex as an index of thyroid function. Postgrad Med 44: 97–102
Reinfrank RF, Kaufman RP, Westone HJ, Glennon JA (1967) Observations of the Achilles reflex test. JAMA 199: 59–62
Shafer RB, Nuttall FQ (1972) Achilles reflex in thyroid disorders. A 10-year clinical evaluation. Am J Med Sci 264: 313–317
Tuck DL (1974) Improved measurement of the Achilles tendon reflex. Med Biol Eng Comput 12: 170–174
Verdy M, Lapierre J, Sansoucy H, Lefebvre R (1968) Shortening of Achilles reflex time after exercise. JAMA 204: 71–73
Waal-Manning HJ (1969) Effect of propranolol on the duration of the Achilles tendon reflex. Clin Pharmacol Ther 10: 199–201
Wiles CM, Young A, Jones DA, Edwards RHT (1979) Muscle relaxation rate, fibre-type composition and energy turnover in hyper- and hypo-thyroid patients. Clin Sci 57: 375–384
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This study was supported by a grant from the Auckland Medical Research Foundation
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Ballantyne, G.H., Croxson, M.S. The effect of exercise, thyroid status and insulin-induced hypoglycaemia on the Achilles tendon reflex time in man. Europ. J. Appl. Physiol. 46, 77–83 (1981). https://doi.org/10.1007/BF00422179
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DOI: https://doi.org/10.1007/BF00422179