The type A behavior pattern, physical fitness, and psychophysiological reactivity

Area of Science:

• Cardiovascular Physiology
• Behavioral Medicine
• Psychophysiology

Background:

• The Type A behavior pattern is linked to cardiovascular disease.
• Aerobic fitness is known to modulate physiological responses to stress.
• The combined effects of these factors on cardiovascular reactivity are not fully understood.

Purpose of the Study:

• To investigate the joint effects of Type A behavior and aerobic fitness on heart rate and blood pressure changes.
• To examine cardiovascular responses to various laboratory stressors in relation to these individual difference variables.

Main Methods:

• Sixty-one college students were classified as Type A or B using the Structured Interview.
• Aerobic fitness was assessed via self-reported activity and estimated VO2max from a step test.
• Participants underwent laboratory challenges including the Structured Interview, snake presentation, mental arithmetic, cold pressor task, and competitive card games.

Main Results:

• Significant differences between Type A and B individuals were observed during the Structured Interview and competitive card games.
• During the Structured Interview, Type A individuals and sedentary subjects exhibited greater blood pressure increases.
• During competitive games, physically fit Type A individuals showed greater blood pressure increases compared to other groups.

Conclusions:

• Cardiovascular reactivity to different stressors is differentially influenced by the interplay of Type A behavior and aerobic fitness.
• Sedentary Type A individuals may be particularly vulnerable to cardiovascular stress during demanding cognitive-social tasks.
• Physically fit individuals, especially Type A, may exhibit heightened cardiovascular responses in competitive, arousal-eliciting situations.