What is the clinical evidence from this study?

Study design: Observational. Population: Asymptomatic, low risk for cardiovascular disease (n=62). Intervention: Maximal treadmill exercise testing. Primary outcome: Electrocardiographic waveform characteristics (amplitudes, ST-segment means and slopes, intervals).

What question did this study set out to answer?

To establish standard electrocardiographic waveform characteristics and evaluate within-subject variability across multi-lead recordings during maximal treadmill exercise testing.

November 1, 1979CirculationOpen Access

Normal electrocardiographic waveform characteristics during treadmill exercise testing.

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Key result

Maximal treadmill exercise testing in asymptomatic men produced characteristic ECG waveform changes, including increased early R-wave amplitude followed by a dramatic decrease at maximum effort.

Why the study?

What are the normal electrocardiographic waveform characteristics and their variability during treadmill exercise testing in asymptomatic men?

Population

62 asymptomatic male subjects at low risk for cardiovascular disease

Design

Cross-sectional

Authors

RWRoger A. WolthuisBrooks Institute VFVictor F. FroelicherPreventive Cardiology AHAndrew HopkirkRoyal Air Force College Cranwell

Discussion

Member takes

Implication

Provides normative ECG data during maximal exercise in asymptomatic men; leaves open diagnostic utility in clinical populations.

Key Points

To establish standard electrocardiographic waveform characteristics and evaluate within-subject variability across multi-lead recordings during maximal treadmill exercise testing.
Digitized and averaged multi-lead ECGs (CC5, CM5, V5, Yh, Z) across pretest, exercise, and recovery conditions in 40 asymptomatic, low-risk men during maximal treadmill testing.
Measured Q-, R-, S-, and T-wave amplitudes, ST-segment means and slopes, J junction levels, and QS and RT intervals.
Conducted repeat maximal treadmill tests two weeks apart in 22 asymptomatic men to quantify pooled within-subject variability.
Average R-wave amplitude increased during early exertion and markedly decreased at maximal effort, whereas average S-wave amplitude progressively increased throughout exercise.
Average J junction shifted from slightly positive pretest to negative during exercise across all leads except lead Z, normalizing post-exercise alongside dramatic increases in ST-segment slope.

Study Design

Type

Observational (n=62)

Structured PICO

What are the normal electrocardiographic waveform characteristics and their variability during treadmill exercise testing in asymptomatic men?

Population

62 asymptomatic male subjects at low risk for cardiovascular disease who completed maximal treadmill testing.

Exposure

Maximal treadmill exercise testing with continuous electrocardiographic recording (leads CC5, CM5, V5, Yh and Z)

Outcome

Electrocardiographic waveform characteristics (Q-, R-, S- and T-wave amplitudes, ST-segment means and slopes, and QS- and RT-interval durations) and their variabilitysurrogate

This study defines the normal physiological changes and variability in electrocardiographic waveform characteristics during maximal treadmill exercise testing in asymptomatic men.

Cite This Study

Wolthuis et al. (1979) conducted an observational in Asymptomatic, low risk for cardiovascular disease (n=62). Maximal treadmill exercise testing was evaluated on Electrocardiographic waveform characteristics (amplitudes, ST-segment means and slopes, intervals). Maximal treadmill exercise testing in asymptomatic men produced characteristic ECG waveform changes, including increased early R-wave amplitude followed by a dramatic decrease at maximum effort.

synapsesocial.com/papers/6a93a9031932af70b4805efc https://doi.org/10.1161/01.cir.60.5.1028

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Normal electrocardiographic waveform characteristics during treadmill exercise testing.

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

Normal electrocardiographic waveform characteristics during treadmill exercise testing.

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Cite This Study

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