caa a22 4500 467942153 CHVBK 20180406153016.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s00421-006-0234-5 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0234-5 Cardiovascular responses to static exercise in boys: insights from tissue Doppler imaging [Elektronische Daten] [Thomas Rowland, Kevin Heffernan, Sae Jae, George Echols, Gary Krull, Bo Fernhall] Ventricular functional changes and mechanisms of the cardiovascular responses during static exercise have not been well delineated in children. In this study, Doppler echocardiographic techniques were utilized to assess cardiovascular adaptations to bilateral isometric leg extension at 30% maximal voluntary contraction for three minutes in a group of 14 healthy boys (mean age 10.2±1.5years). Mean heart rate rose from 77±9 to 106±11bpm, stroke volume fell from 59±9 to 52±7ml, and cardiac output increased from 4.58±0.58 to 5.62±0.81l min-1 (P<0.05). Mean arterial pressure rose from 86±7 to 109±9mm Hg, with no significant change in peripheral vascular resistance. By tissue Doppler imaging markers, inotropic function improved by 59%, while lusitropic function increased 38%. These findings suggest that (1) cardiovascular responses to static leg extension in boys are similar to those in adult men, and (2) isometric leg extension triggers modest increases in both systolic and diastolic function. Springer-Verlag, 2006 Cardiovascular fitness nationallicence Resistance exercise nationallicence Heart function nationallicence Rowland Thomas Department of Pediatrics, Baystate Medical Center, 01106, Springfield, MA, USA aut Heffernan Kevin Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut Jae Sae Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut Echols George Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut Krull Gary Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut Fernhall Bo Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut European Journal of Applied Physiology Springer-Verlag 97/5(2006-07-01), 637-642 1439-6319 97:5<637 2006 97 421 https://doi.org/10.1007/s00421-006-0234-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0234-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rowland Thomas Department of Pediatrics, Baystate Medical Center, 01106, Springfield, MA, USA aut NATIONALLICENCE 700 1- Heffernan Kevin Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut NATIONALLICENCE 700 1- Jae Sae Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut NATIONALLICENCE 700 1- Echols George Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut NATIONALLICENCE 700 1- Krull Gary Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut NATIONALLICENCE 700 1- Fernhall Bo Department of Kinesiology, University of Illinois, Urbana-Champaign, IL, USA aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/5(2006-07-01), 637-642 1439-6319 97:5<637 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer