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Muscle power increases after resistance training in growth-hormone-deficient adults

2002; Lippincott Williams & Wilkins; Volume: 34; Issue: 10 Linguagem: Inglês

10.1097/00005768-200210000-00008

1530-0315

Carla Werlang Coelho, CLAUDIO REBELLO VELLOSO, Rosane Resende de Lima Oliveira Brasil, Mário Vaisman, CLAUDIO GIL SOARES DE ARA JO,

Childhood Cancer Survivors' Quality of Life

COELHO, C. W., C. R. VELLOSO, R. R. DE LIMA OLIVEIRA BRASIL, M. VAISMAN, and C. G. SOARES DE ARAÚJO. Muscle power increases after resistance training in growth-hormone-deficient adults. Med. Sci. Sports Exerc., Vol. 34, No. 10, pp. 1577–1581, 2002. Purpose To measure the effects of a resistance training (RT) program over muscle function and body composition of adults with GH deficiency without replacement. Methods 11 GH-deficient patients (39 ± 11 yr) were evaluated in four occasions (two pretraining and at 6 and 12-wk of training). We performed anthropometric measurements and physical tests. Muscle power was measured by a specific tensiometer (Fitro, Bratislava, Slovakia) in five different exercises: seated chest press, rear lat pull-down, knee extension, standing upright row, and triceps press down. Muscle endurance was assessed by maximum number of sit-ups and maximum static strength by measurement with a handgrip dynamometer. A 12-wk home-based RT program was individually prescribed and consisted of 13 exercises, performed each other day, using simple material. Results No significant differences occurred in body weight or limb circumferences (P > 0.05), although the sum of central skinfolds decreased with RT (111 ± 9 vs 100 ± 9 mm;P < 0.05). RT induced significant gains in four of five exercises: rear lat pull-down (141 ± 19 vs 198 ± 20 W), standing upright row (134 ± 22 vs 157 ± 24 W), triceps press down (85 ± 14 vs 123 ± 21 W), and seated chest press (114 ± 20 vs 143 ± 21 W;P < 0.05). Sit-up results also showed significant improvements, while handgrip did not (P > 0.05). Conclusion GH-deficient adults without GH replacement may improve their maximum muscle power when submitted to an individualized, simple, and short home-based RT program. Considering that limb girths did not significantly change, the gains were most likely due to improvements in neuromuscular components.