SwePub
Sök i LIBRIS databas

  Utökad sökning

WFRF:(Braunschweig Frieder)
 

Sökning: WFRF:(Braunschweig Frieder) > (2010-2014) > Late cardiovascular...

Late cardiovascular drift observable during ultra endurance exercise.

Mattsson, C. Mikael (författare)
Karolinska Institutet,Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp
Ståhlberg, Marcus (författare)
Karolinska Institutet,Institutionen för Medicin, Enheten för kardiologi, Karolinska Universitetssjukhuset
Larsen, Filip (författare)
Karolinska Institutet,Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp
visa fler...
Braunschweig, Frieder (författare)
Karolinska Institutet,Institutionen för Medicin, Enheten för kardiologi, Karolinska Universitetssjukhuset
Ekblom, Björn (författare)
Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp
visa färre...
 (creator_code:org_t)
2011
2011
Engelska.
Ingår i: Medicine & Science in Sports & Exercise. - 0195-9131 .- 1530-0315. ; 43:7, s. 1162-1168
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Introduction: The present study investigates the adaptation of the central circulation to ultraenduranceexercise, including the relative contributions of changes in stroke volume (SV) andarterio-venous oxygen difference (a-v O2 diff) to the increased oxygen pulse (VO2/HR).Methods: We evaluated subjects undergoing 12h of mixed exercise at controlled intensity(n=8) and a 53h Adventure race (n=20). Heart rate (HR), oxygen uptake (VO2), and cardiacoutput determined using non-invasive gas rebreathing (CORB) were measured during cyclingat fixed work rate after 0, 4, 8, 12 hours, and 0, 20, and 53 hours of continuous exercise in the12 and 53 h protocol, respectively.Results and Conclusion: The central circulation changed in several steps in response to ultraenduranceexercise. Compared to initial levels, VO2 was increased at every time-point measured.The increase was attributed to peripheral adaptations, confirmed by a close correlation betweenchange in VO2 and change in a-v O2 diff. The first step of the circulatory response was typical ofnormal (early) cardiovascular drift, with increased HR and concomitantly decreased SV andVO2/HR, occurring over the first 4-6 h. The second step, which continued until approximately 12h, included reversed HR-drift, with normalization of SV and VO2/HR. When exercise continueduntil 50 h late cardiovascular drift was noted, characterized by increased VO2/HR, (indicatingmore efficient energy distribution), decreased peripheral resistance, increased stroke volume, anddecreased work of the heart. Since cardiac output was maintained at all time points we interpretthe changes as physiologically appropriate adaptations to ultra-endurance exercise.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Fysiologi (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Physiology (hsv//eng)

Nyckelord

Cardiac output
oxygen uptake
heart rate
stroke volume
oxygen pulse
adventure race
Physiology
Fysiologi
Medicin/Teknik
Medicine/Technology

Publikations- och innehållstyp

ref (ämneskategori)
art (ämneskategori)

Hitta via bibliotek

Till lärosätets databas

Sök utanför SwePub

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy