Training responses of two age groups during treadmill walking

Area of Science:

• Exercise Physiology
• Sports Science
• Human Performance

Background:

• Untrained individuals experience significant physiological adaptations following a structured exercise regimen.
• Assessing training-induced changes requires reliable and valid performance metrics.
• Age-related differences in physiological responses to training are well-documented.

Purpose of the Study:

• To evaluate training-induced physiological and performance changes in middle-aged and young adult men.
• To assess the efficacy of a standardized treadmill walking test in reflecting training adaptations across different age groups.
• To compare the training responses between middle-aged and young adult men over a six-week period.

Main Methods:

• A six-week training intervention was implemented for two groups of untrained men: middle-aged (mean age 41.3 yr) and young adults (mean age 19.9 yr).
• Participants underwent a standardized treadmill walking test before and after the training period.
• Physiological measures including heart rate, blood lactic acid, Respiratory Exchange Ratio, Ventilatory Equivalents, and oxygen cost were recorded.
• Performance was assessed via mean Two Mile times.

Main Results:

• Middle-aged men exhibited significantly lower heart rates across all work intensities post-training compared to young adults.
• Significant improvements in blood lactic acid, Respiratory Exchange Ratio, Ventilatory Equivalents, and Two Mile times were observed in the middle-aged group.
• The oxygen cost of the walking test decreased more substantially in the middle-aged group compared to the young adult group after training.
• The treadmill test effectively reflected training status in both age groups, irrespective of the testing environment (treadmill vs. track).

Conclusions:

• A six-week training program significantly enhances cardiorespiratory fitness and performance in both middle-aged and young adult men.
• Middle-aged men demonstrate greater relative improvements in several physiological markers compared to young adults following similar training.
• The developed treadmill walking test is a valid and sensitive tool for assessing training-induced adaptations in diverse adult age groups.