MMG and EMG Responsesof the Superficial Quadriceps Femoris Muscles during the Wingate Anaerobic Cycle Ergometer Test

The effect of beta-adrenergic blockade on the drift in O2 consumption (VO2 drift) typically observed during prolonged constant-rate exercise was studied in 14 healthy males in moderate heat at 40% of maximal O2 consumption (VO2max). After an initial maximum cycle ergometer test to determine the subjects' control VO2max, subjects were administered each of three medications: placebo, atenolol (100 mg once daily), and propranolol (80 mg twice daily), in a randomized double-blind fashion. Each medication period was 5 days in length and was followed by a 4-day washout period. On the 3rd day of each medication period, subjects performed a maximal cycle ergometer test. On the final day of each medication period, subjects exercised at 40% of their control VO2max for 90 min on a cycle ergometer in a warm (31.7 +/- 0.3 degrees C) moderately humid (44.7 +/- 4.7%) environment. beta-Blockade caused significant (P less than 0.05) reductions in VO2max, maximal minute ventilation (VEmax), maximal heart rate (HRmax), and maximal exercise time. Significantly greater decreases in VO2max, VEmax, and HRmax were associated with the propranolol compared with the atenolol treatment. During the 90-min submaximal rides, beta-blockade significantly reduced heart rate. Substantially lower values for O2 consumption (VO2) and minute ventilation (VE) were observed with propranolol compared with atenolol or placebo. Furthermore, VO2 drift and HR drift were observed under atenolol and placebo conditions but not with propranolol. Respiratory exchange ratio decreased significantly over time during the placebo and atenolol trials but did not change during the propranolol trial.(ABSTRACT TRUNCATED AT 250 WORDS)

Download Full-text

The 10-min Cycle Ergometer Test

The Journal of Strength and Conditioning Research ◽

10.1519/00124278-199802000-00003 ◽

1998 ◽

Vol 12 (1) ◽

pp. 12-17

Author(s):

Paul M. Vanderburgh ◽

Greg Daniels ◽

Todd A. Crowder ◽

Tony Lachowetz ◽

Robb Elliott

Keyword(s):

Cycle Ergometer ◽

Cycle Ergometer Test ◽

Ergometer Test

Download Full-text

A Clinical Method for Estimation of VO2max Using Seismocardiography

International Journal of Sports Medicine ◽

10.1055/a-1144-3369 ◽

2020 ◽

Vol 41 (10) ◽

pp. 661-668

Author(s):

Kasper Sørensen ◽

Mathias Krogh Poulsen ◽

Dan Stieper Karbing ◽

Peter Søgaard ◽

Johannes Jan Struijk ◽

...

Keyword(s):

Prediction Model ◽

Cardiorespiratory Fitness ◽

Demographic Data ◽

Cycle Ergometer ◽

Accurate Estimation ◽

Clinical Method ◽

Cycle Ergometer Test ◽

Aortic Valve Closure ◽

Proposed Model ◽

Ergometer Test

AbstractThe purpose of this study was to investigate the correlation between the seismocardiogram and cardiorespiratory fitness. Cardiorespiratory fitness can be estimated as VO2max using non-exercise algorithms, but the results can be inaccurate. Healthy subjects were recruited for this study. Seismocardiogram and electrocardiogram were recorded at rest. VO2max was measured during a maximal effort cycle ergometer test. Amplitudes and timing intervals were extracted from the seismocardiogram and used in combination with demographic data in a non-exercise prediction model for VO2max. 26 subjects were included, 17 females. Mean age: 38.3±9.1 years. The amplitude following the aortic valve closure derived from the seismocardiogram had a significant correlation of 0.80 (p<0.001) to VO2max. This feature combined with age, sex and BMI in the prediction model, yields a correlation to VO2max of 0.90 (p<0.001, 95% CI: 0.83–0.94) and a standard error of the estimate of 3.21 mL·kg−1·min−1 . The seismocardiogram carries information about the cardiorespiratory fitness. When comparing to other non-exercise models the proposed model performs better, even after cross validation. The model is limited when tracking changes in VO2max. The method could be used in the clinic for a more accurate estimation of VO2max compared to current non-exercise methods.

Download Full-text