Endocrine Response Patterns to Acute Unilateral and Bilateral Resistance Exercise in Men

• DOI: 10.1519/jsc.0b013e3181a92dc5
• Publication Date: 2010-11-06T05:48:17Z
• Authors: Matthew J Migiano; Jakob L Vingren; Jeff S Volek; Carl M Maresh; Maren S Fragala; Jen-Yu Ho; Gwendolyn A Thomas; Disa L Hatfield; Keijo Häkkinen; Juha Ahtiainen; Jacob E Earp; William J Kraemer
• Keywords: Adult; Male; Adolescent; Hydrocortisone; Human Growth Hormone; Physical Exertion; 610; Resistance Training; Neuromuscular rehab protocols; 796; Hemoglobins; Young Adult; 03 medical and health sciences; 0302 clinical medicine; Hematocrit; Androgens; Arm; Lactates; Humans; Insulin; Testosterone; Endocrine; Glucocorticoids

Rehabilitation programs and research experiments use single-arm protocols in which the contralateral arm is not functional or used as a control limb. This study was interested determining hormonal signal impacts of such one- versus two-arm exercise responses that might have an impact on adaptational changes with training. The purpose to examine acute unilateral bilateral upper-body resistance (RE) protocol. A balanced randomized treatment intervention series time frame for blood collections before after basic experimental design. Ten recreationally trained men (18-25 years, 20.4 +/- 1.2 175.6 4.5 cm, 81.7 9.3 kg) gave informed consent participate investigation. Each subject performed (dominant only) RE protocol separated by 1 week fashion. consisted 3 sets 10 repetitions 5 different dumbbell exercises at 80% 1-repetition maximum, samples were obtained 5, 15, 30 minutes immediately postexercise (IP). Blood analyzed lactate, immunoreactive growth hormone (iGH), cortisol (C), total testosterone (T), insulin concentrations. Total volume work also determined 2 sessions. during 52.1% Both elicited significant (p < = 0.05) increase lactate iGH, but condition significantly greater. Cortisol decreased recovery condition. Testosterone affected either Insulin increased IP both conditions.These results indicate dominant-arm blunted compared RE. differential endocrine response likely result difference between protocols. It important pay attention amount muscle mass utilized optimize signaling.