What question did this study set out to answer?

This research aims to explore the early phases of O2 uptake and heart rate during exercise at varying intensities and their correlation with fitness levels.

December 1, 1989Journal of Applied Physiology

Early dynamics of O2 uptake and heart rate as affected by exercise work rate

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Why the study?

Does exercise work rate and fitness affect the early dynamics (phase I) of O2 uptake and heart rate in normal subjects?

Population

10 normal subjects

Design

Other

Authors

KSKathy E. SietsemaThe Lundquist Institute JDJennifer A DalyTufts Medical Center KWKarlman WassermanCross-Cutting Cardiology

Discussion

Member takes

Implication

May require work rate standardization in phase I testing; leaves open fitness modulation of early VO2/HR dynamics.

Key Points

This research aims to explore the early phases of O2 uptake and heart rate during exercise at varying intensities and their correlation with fitness levels.
Ten subjects exercised from rest to five different work rates, including unloaded cycling and up to 150 W.
Measurements of O2 uptake (Vo2) and heart rate (HR) were taken during phase I of exercise response.
Analysis focused on how changes in Vo2 and HR correlated with fitness and work rate.
Phase I increases in Vo2, HR, and Vo2/HR showed small significant correlations with work rate but not with fitness levels.
At very low work rates, Vo2 and HR exceeded steady-state levels, eliminating phase II increases.
Mean response times for Vo2 and HR were slower than those for Vo2/HR and were influenced by fitness.

Structured PICO

Does exercise work rate and fitness affect the early dynamics (phase I) of O2 uptake and heart rate in normal subjects?

Population

10 normal subjects

Intervention

Exercise from rest to each of five work rates ranging from unloaded cycling to 150 W

Outcome

Phase I increases of Vo2, HR, and Vo2/HRsurrogate

Phase I increases in Vo2 and HR during exercise correlate with work rate but not fitness, with circulatory adjustments meeting entire O2 requirements at very low work rates.

Cite This Study

Sietsema et al. (1989) studied this question.

synapsesocial.com/papers/6a203b89cb26ec8ce28fd3c4 https://doi.org/10.1152/jappl.1989.67.6.2535

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Early dynamics of O2 uptake and heart rate as affected by exercise work rate

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Early dynamics of O2 uptake and heart rate as affected by exercise work rate

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Also Consider