PMID- 15630146
OWN - NLM
STAT- MEDLINE
DCOM- 20060627
LR  - 20191109
IS  - 1066-7814 (Print)
IS  - 1066-7814 (Linking)
VI  - 29
IP  - 6
DP  - 2004 Dec
TI  - Heart rate running speed relationships-during exhaustive bouts in the laboratory.
PG  - 731-42
AB  - The present study was designed to investigate the heart rate-running speed 
      (HR-RS) relationship while exercising continuously, at high intensities, on a 
      treadmill. The purpose was to precisely measure the magnitude of drop in RS 
      necessary to maintain HR during intense exhaustive exercises, and to determine 
      whether the magnitude of drop in RS is directly dependent on exercise intensity. 
      Sixteen male endurance athletes performed five treadmill tests: an incremental 
      test for maximal O2 uptake and maximum aerobic velocity (VMA), and four 
      exhaustive tests: at 82, 86, 89, and 92 % VMA. After an adaptation period of 3 
      min, the objective was to stabilise HR by adjusting the treadmill speed 
      continuously by +/- 0.5 km x h(-1) every 30 sec. Attained intensities were: 82 % 
      (+/-6), 84 % +/- (6), 89 % (+/-3), and 90 % (+/-6) VMA, respectively [L1, L2] vs. 
      [L3, L4], p < 0.05. Time to exhaustion across the increasing intensities, 
      respectively, were: 36.58 (+/-4.45), 24.63 (+/-3.25), 15.80 (+/-2.00), and 9.87 
      (+/-1.15) min, p < 0.05, with the exception of L3 vs. L4. The RS/HR ratio vs. 
      speed showed three phases: an increasing adaptive (AB) phase 0-165 sec with an 
      averaging maximal level of 1.67 m x beat(-1) at 165 sec, a transitional period 
      170-245 sec, and a decreasing (BC) phase 250-1800 sec with a lower level of 1.29 
      m .beat(-1) at 1800 sec. In our experimental conditions, for high intensities 82 
      to 90 % VMA, cardiac drift which disturbed the RS-HR relationship with duration 
      was evaluated: -0.143 km x h(-1) per minute for HR stabilisation. This cardiac 
      drift is a linear function of time. Results suggest that HR and RS are not 
      interchangeable variables for this kind of exercises, and it seems more reliable 
      to gauge exercise intensity using RS than HR.
FAU - Boudet, Gil
AU  - Boudet G
AD  - Laboratoire de Medecine du Travail, et Laboratoire de Biostatistique, Universite 
      d' Auvergne, Clermont-Ferrand, France.
FAU - Albuisson, Elianne
AU  - Albuisson E
FAU - Bedu, Mario
AU  - Bedu M
FAU - Chamoux, Alain
AU  - Chamoux A
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Can J Appl Physiol
JT  - Canadian journal of applied physiology = Revue canadienne de physiologie 
      appliquee
JID - 9306274
SB  - IM
MH  - Adult
MH  - Data Interpretation, Statistical
MH  - Exercise/physiology
MH  - Exercise Test
MH  - Heart Rate/*physiology
MH  - Humans
MH  - Male
MH  - Oxygen Consumption/physiology
MH  - Physical Endurance/*physiology
MH  - Running/*physiology
MH  - Time Factors
EDAT- 2005/01/05 09:00
MHDA- 2006/06/28 09:00
CRDT- 2005/01/05 09:00
PHST- 2005/01/05 09:00 [pubmed]
PHST- 2006/06/28 09:00 [medline]
PHST- 2005/01/05 09:00 [entrez]
AID - 10.1139/h04-047 [doi]
PST - ppublish
SO  - Can J Appl Physiol. 2004 Dec;29(6):731-42. doi: 10.1139/h04-047.