Acute and cumulative effects of focused high-frequency vibrations on the endocrine system and muscle strength

• Published in: European journal of applied physiology Vol. 111; no. 6; pp. 897 - 904
• Main Authors: Iodice, Pierpaolo, Bellomo, Rosa Grazia, Gialluca, Glaugo, Fanò, Giorgio, Saggini, Raoul
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.06.2011; Springer; Springer Nature B.V; Springer Verlag
• Subjects: Adult; Algorithms; Biological and medical sciences; Biomedical and Life Sciences; Biomedicine; Creatine Kinase - blood; Creatine Kinase - metabolism; Endocrine system; Endocrine System - metabolism; Endocrine System - physiology; Exercise - physiology; Fundamental and applied biological sciences. Psychology; Growth hormones; Human health and pathology; Human Physiology; Humans; Hydrocortisone - analysis; Hydrocortisone - blood; Hydrocortisone - metabolism; Life Sciences; Male; Muscle strength; Muscle Strength - physiology; Muscle, Skeletal - physiology; Occupational Medicine/Industrial Medicine; Original Article; Resistance Training - methods; Running - physiology; Sports Medicine; Sports training; Strength training; Testosterone; Testosterone - analysis; Testosterone - blood; Time Factors; Tissues and Organs; Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports; Vibration; Vibration - adverse effects; Young Adult; Testosterone; High-intensity local vibration; Muscle strength; Growth hormone; Jumping performance; Human; Vibration; Androgen; Acute; Intensity; Somatotropin; Sport; Adenohypophyseal hormone; Testicular hormone; Sex steroid hormone; High frequency; Performance; Jumping
• ISSN: 1439-6319; 1439-6327; 1439-6327
• DOI: 10.1007/s00421-010-1677-2

The purpose of this study was to evaluate the acute and long-term effects of local high-intensity vibration (HLV, f   =  300 Hz) on muscle performance and blood hormone concentrations in healthy young men. Totally 18 subjects (cV group) were studied in two sessions, either without (control) or with HLV treatment. The protocol was the same on both control and test days, except that, in the second session, subjects underwent HLV treatment. Counter-movement jumping (CMJ), maximal isometric voluntary contraction (MVC) test, and hormonal levels were measured before the procedure, immediately thereafter, and 1 h later. To assess the long-term effects of HLV, the cV group was subjected to HLV on the leg muscles for 4 weeks, and a second group (cR group, n  = 18) embarked upon a resistance training program. All subjects underwent an MVC test and an isokinetic (100 deg/s) test before training, 4 weeks after training, and 2 months after the end of training. The HLV protocol significantly increased the serum level of growth hormone (GH, P  < 0.05) and creatine phosphokinase (CPK, P  < 0.05), and decreased the level of cortisol ( P  < 0.05). None of GH, CPK or testosterone levels were altered in controls. There was a significant improvement in MVC ( P  < 0.05). After 4 weeks, both the cV and cR groups demonstrated significant improvement in MVC and isokinetic tests ( P  < 0.05). This increase persisted for at least 2 months. Our results indicate that HLV influences the levels of particular hormones and improves neuromuscular performance. Our results indicate that HLV has a long-term beneficial effect comparable to that of resistance training.