Effect of testosterone administration and weight training on muscle architecture
| Autor: | Anthony Giorgi, Anthony J. Blazevich |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Adult
Male medicine.medical_specialty Weight Lifting Strength training medicine.medical_treatment Physical Therapy Sports Therapy and Rehabilitation Placebo Bench press Random Allocation Internal medicine medicine Humans Testosterone Orthopedics and Sports Medicine Muscle Skeletal Saline Ultrasonography Analysis of Variance Dose-Response Relationship Drug business.industry Triceps brachii muscle Fascicle Endocrinology Anesthesia Body Composition Muscle architecture Intramuscular injection business |
| Zdroj: | Medicine & Science in Sports & Exercise. 33:1688-1693 |
| ISSN: | 0195-9131 |
| DOI: | 10.1097/00005768-200110000-00012 |
| Popis: | BLAZEVICH, A. J., and A. GIORGI. Effect of testosterone administration and weight training on muscle architecture. Med. Sci. Sports Exerc., Vol. 33, No. 10, 2001, pp. 1688-1693. Purpose: The purpose of this study was to assess muscle architecture changes in subjects who were administered supraphysiologic doses of testosterone enanthate (TE) and concurrently performed heavy resistance training. Methods: Ten subjects were randomly selected from the 21 subjects who participated in a previously published study (12). Subjects were allocated to one of two groups as per Giorgi et al. (12) and received either a saline-based placebo (nonTE) or a 3.5-mg.kg- body weight dose of TE by deep intramuscular injection once a week for 12 wk. Subjects also performed heavy resistance training using exercises that targeted the triceps brachii muscle. Before and after the training period, free-weight one-repetition-maximum (I-RM) bench press strength was tested, muscle thickness and pennation of the triceps brachii lateralis were measured using ultrasound imaging, and fascicle length was estimated from ultrasound photographs. Results: There were no significant between-group differences in muscle thickness changes despite a trend toward increased thickness in TE subjects (TE, 23.5%, vs nonTE, 13.8%). However, I-RM bench press performance and muscle pennation increased significantly in TE subjects compared with nonTE subjects (P < 0.05). There was also a trend toward longer fascicle lengths in the muscles of nonTE subjects. Conclusion: The results of the present study suggest that the use of TE in conjunction with heavy resistance training is associated with muscle architecture changes that are commonly associated with high-force production. Since there was little difference between the groups in muscle thickness, changes in pennation |
| Databáze: | OpenAIRE |
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