Oxygen Uptake Kinetics During Recovery From Maximal and Submaximal Exercise

NCT00001519 | Completed

• 2 other identifiers: 96009896-CC-0098
• Study Type: observational
• Target: 5
• Locations: 1 country
• Sites: 1

Brief Summary

Measurements of dynamic changes in oxygen uptake (VO2 kinetics) during recovery from exercise may describe regulatory control of oxygen transport and utilization and have greater reliability and less inherent risk than assessment of maximal oxygen uptake (VO2max) in patients for whom exercise is limited by pain, excessive fatigue, dyspnea and motivation. The purpose of this pilot study is to evaluate the effect of exercise intensity on the time constant describing changes in VO2 (tauVO2) during recovery from one minute of constant work rate exercise. Five normal healthy volunteers ages 18 and older will perform a progressive maximal aerobic exercise test, using a cycle ergometer, to determine VO2max and lactate threshold (LT) estimated by gas exchange. Each subject will also complete a series of maximal constant work rate tests and submaximal constant work rate tests at 80% LT and 50% of the difference between LT and VO2max (50% delta). Breath by breath variability and VO2 span will be used to determine the number of constant work rate test repetitions, for each subject for each exercise intensity, needed to establish confidence in tauVO2. A mean response profile of VO2 recovery kinetics for each exercise intensity will be analyzed using non-linear regression to determine tauVO2. To examine the effect of exercise intensity on tauVO2, one way analysis of variance will be used to determine whether differences exist among maximal and submaximal (80% LT and 50% delta) time constants. We hypothesize that there will be no significant differences among time constants for VO2 during recovery from maximal and submaximal constant work rate exercise lasting one minute. The results of this study are expected to provide increased understanding of the measurement of VO2 kinetics during recovery.

Conditions

Healthy

Keywords

Exercise; Exercise Intensity; Non-Linear Regression; Oxygen Uptake; Recovery; Subject Comparison; Time Constant; VO2

Eligibility Criteria

• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

Normal healthy subjects ages 18 and older.

Contact the study team to discuss eligibility requirements. They can help determine if this study is right for you.

Sponsors & Collaborators

• National Institutes of Health Clinical Center (CC): lead

Study Sites (1)

Warren G. Magnuson Clinical Center (CC)

Bethesda, Maryland, 20892, United States

Location

Related Publications (3)

• Sietsema KE, Cooper DM, Perloff JK, Rosove MH, Child JS, Canobbio MM, Whipp BJ, Wasserman K. Dynamics of oxygen uptake during exercise in adults with cyanotic congenital heart disease. Circulation. 1986 Jun;73(6):1137-44. doi: 10.1161/01.cir.73.6.1137.

  PMID: 3698248 BACKGROUND

• Hughson RL. Alterations in the oxygen deficit-oxygen debt relationships with beta-adrenergic receptor blockade in man. J Physiol. 1984 Apr;349:375-87. doi: 10.1113/jphysiol.1984.sp015161.

  PMID: 6429319 BACKGROUND

• Powers SK, Dodd S, Beadle RE. Oxygen uptake kinetics in trained athletes differing in VO2max. Eur J Appl Physiol Occup Physiol. 1985;54(3):306-8. doi: 10.1007/BF00426150.

  PMID: 4065115 BACKGROUND

MeSH Terms

Conditions

Motor Activity

Condition Hierarchy (Ancestors)

Behavior

Study Design

• Study Type: observational
• Sponsor Type: NIH

Study Record Dates

• First Submitted: November 3, 1999
• First Posted: December 10, 2002
• Study Start: June 1, 1996
• Study Completion: April 1, 2001
• Last Updated: March 4, 2008

Record last verified: 2000-05

Locations

US (1)