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Preclinical exercise studies typically use two forms of exercise training protocols: 1) voluntary wheel running and 2) forced treadmill running. Previous work from our group clearly demonstrates that older (18-month-old) male mice do not voluntarily engage in wheel running, especially compared to younger males or female mice. Therefore, we implemented a forced exercise treadmill training protocol to determine if treadmill training was superior to wheel running in improving aerobic capacity in older male mice. PURPOSE: To determine if a 3-week treadmill training protocol improved time to exhaustion (TTE) in older male mice. METHODS: 18-month-old male mice (n=5) were provided a running wheel in their individual cage for 2 weeks or underwent daily treadmill training (n=6) for 3 weeks with increasing speed/incline. At the end of the training period we assessed TTE. RESULTS: Older male mice that trained on the treadmill demonstrated higher TTE compared to wheel (1382 □ 32 seconds versus 500 □ 99 seconds, respectively). In addition, older male mice that trained on the treadmill improved on average ~8% in their TTE test. CONCLUSION: A 3-week treadmill training protocol improves aerobic capacity in older male mice to a greater extent than voluntary wheel running. Ongoing experiments will utilize this training protocol to understand age-related declines in cardiorespiratory fitness, circadian rhythm, and to test exercise as an intervention in the aging population.

Treadmill Training Improves Aerobic Capacity in Aged Male Mice Compared to Voluntary Wheel Running