Inspiratory muscle performance in endurance-trained elderly males during incremental exercise

Area of Science:

• Exercise Physiology
• Aging Research
• Respiratory Medicine

Background:

• Inspiratory muscle performance declines with age.
• Endurance training is known to improve respiratory muscle function.
• The effects of lifelong endurance training on inspiratory muscles in older athletes are not fully understood.

Purpose of the Study:

• To compare inspiratory muscle performance during incremental exercise in fit old endurance-trained athletes (OT) versus fit young athletes (YT) and healthy age-matched controls (OC).
• To investigate the impact of lifelong endurance training on respiratory muscle function in elderly individuals.

Main Methods:

• Participants included twelve fit old endurance-trained athletes (OT), fit young athletes (YT), and healthy age-matched controls (OC).
• Inspiratory muscle performance was assessed using the tension-time index (TT0.1) during incremental exercise.
• Key parameters measured included mouth occlusion pressure (P0.1), maximal inspiratory pressure (PImax), and the duty cycle (ti/ttot).

Main Results:

• The OT group exhibited lower P0.1, P0.1/PImax ratio, TT0.1, and effective impedance of respiratory muscles compared to the OC group, but higher values than the YT group for a given VCO2.
• At maximal exercise, the P0.1/PImax ratio and TT0.1 remained lower in the OT group than the OC group and higher than the YT group.
• The study indicated lower inspiratory muscle performance (higher TT0.1) during exercise in the OT group compared to the YT group, but this decline was less pronounced in lifelong trained elderly men than in sedentary elderly subjects.

Conclusions:

• Lifelong endurance training appears to mitigate the age-related decline in inspiratory muscle performance.
• Older endurance-trained athletes demonstrate preserved, though not fully matched, inspiratory muscle function compared to younger athletes.
• Sedentary elderly individuals exhibit more significant reductions in inspiratory muscle performance than their trained counterparts.