A 3-minute recumbent stepper test in chronic stroke.

Area of Science:

• Cardiovascular disease
• Neurology
• Exercise physiology

Background:

• Stroke survivors often struggle to reach target heart rates during graded exercise testing (GXT).
• This limitation can reduce the sensitivity of GXT for detecting cardiac conditions in this population.
• A novel Recumbent Stepper 3-minute (RS 3Min) "all out" test is proposed to enhance stress testing sensitivity post-stroke.

Purpose of the Study:

• To assess the feasibility of incorporating the RS 3Min test following a standard GXT in individuals who have experienced a stroke.
• To determine if the RS 3Min test can improve the ability of stroke survivors to reach their target heart rate during exercise testing.

Main Methods:

• A within-participant, repeated measures design was employed.
• Fifteen participants with chronic stroke underwent two testing protocols: a symptom-limited treadmill GXT and a symptom-limited Recumbent Stepper GXT followed by the RS 3Min critical power test.
• Key measures included heart rate, perceived exertion, oxygen consumption, respiratory exchange ratio, power output, and blood pressure.

Main Results:

• The RS 3Min test demonstrated a significantly higher rate of achieving target heart rate compared to the RS GXT (9/14 vs. 4/14, p=0.02).
• The RS 3Min test showed comparable results to the treadmill GXT regarding target heart rate achievement (9/14 vs. 5/14, p=0.09).
• Minimum power output during the RS 3Min test was significantly higher than peak power output during the RS GXT (110±41 W vs. 84±22 W, p=0.02), with 12/15 participants reaching a VO2 plateau.

Conclusions:

• The novel RS 3Min "all out" test shows promise for improving cardiovascular screening sensitivity in stroke survivors.
• This test may offer a valid method for assessing critical power in this population.
• Further research with randomized designs is recommended to confirm these findings.