Postural specificity of cardiovascular adaptations to exercise training

Area of Science:

• Exercise Physiology
• Cardiovascular Adaptations
• Sports Science

Background:

• Posture during exercise can influence physiological responses.
• Understanding how training posture affects cardiovascular adaptations is crucial for optimizing exercise prescriptions.
• Limited research exists on the transferability of training-induced cardiovascular adaptations between supine and upright postures.

Purpose of the Study:

• To investigate if posture affects the magnitude of cardiovascular adaptations to exercise training.
• To determine if cardiovascular adaptations from supine training generalize to upright exercise and vice versa.

Main Methods:

• Sixteen sedentary men trained for 8 weeks using interval and continuous cycling in either supine or upright posture.
• Maximal oxygen uptake (VO2 max) was measured during both supine and upright cycling.
• Cardiovascular parameters including end-diastolic volume, stroke volume, heart rate, and blood pressure were assessed during submaximal exercise.

Main Results:

• Supine training group (STG) showed greater increases in maximal oxygen uptake during supine cycling (22.9%) compared to upright training group (UTG) (6.0%).
• UTG exhibited greater improvements in maximal oxygen uptake during upright cycling (14.6%) compared to STG (16.1%).
• Significant increases in stroke volume and end-diastolic volume were observed during supine cycling in STG, and during upright cycling in UTG.

Conclusions:

• Posture during exercise training influences the magnitude and specificity of cardiovascular adaptations.
• Adaptations from supine training partially transferred to upright exercise, and vice versa, but were not fully generalized.
• Upright training led to a significant increase in blood volume, suggesting a greater impact on plasma volume expansion.