Effects of intermittent upper-body static presses during treadmill walking

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Berry, Bobby D.
Young, Kaelin C.
Smith, Sam
Waterson, Ryan E.
Tucker, Matthew L.
Bryant, Lauren
Patterson, Jeremy A.
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Individuals have been adding hand-weights to walking regimens to increase caloric expenditure and arm strength. This is typically contraindicated due to changes in mechanics caused by weighted swinging arms. To address this safely concern we used a new commercial treadmill with a modified support rail that allowed a resistance to be applied to the upper body without the forces of the swinging hand-weights. PURPOSE: The purpose of this study was to assess heart rate (HR) and workload on healthy individuals, while walking on a modified treadmill that applied intermittent upper-body static presses. METHODS: Fifteen college-aged (age: 24.9 ± 7.3 yrs, height: 1.72 ± 0.08 m, weight: 73.8 ± 13.7 kg) males (n= 9) and females (n=6) randomly completed two exercise trials (WALK and WALK + RES) on separate days using a specially designed treadmill equipped with an adjustable weighted sled apparatus. Subjects walked at a set speed of 4.0 mph throughout the trial starting at a grade of 0.5% which increased 2% every 2 minutes for a total of ten minutes. The WALK + RES trial incorporated an upper body static press against a weighted sled set at 11.4 kg of resistance. During the WALK + RES trial, subjects completed two 30 second static presses separated by 30 seconds of upper-body relaxation during each 2-minute stage. HR and RPE were recorded every 30 seconds over the ten minute trial using a Polar HR system and Borg scale, respectively. RESULTS: Maximum achieved (145.0 ± 24.8, 174.6 ± 21.7) and average (123.2 ± 21.9, 149.3 ± 21.4) HR were both significantly (p < 0.001) different between the WALK and WALK + RES trials, respectively. Furthermore, average workload was higher during the WALK + RES (77% HRmax) compared to the WALK (64% HRmax) trial. CONCLUSION: Adding upper-body resistance to walking significantly increases workload. The modified treadmill allows participants to fix their hands to a rail, similar to pushing a cart addressing the safety concerns of lumbar rotation caused by hand-weights Adding functional resistance upper-body exercise during walking may be an effective mode of exercise to concomitantly increase strength and aerobic capacity in special populations. The average percentage of HRmax with resistance was 77% and 64% without, corresponding to ACSM classifications of Hard and Moderate exercise intensity.

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Berry, Bobby D.; Young, Kaelin C.; Smith, Sam; Waterson, Ryan E.; Tucker, Matthew L.; Bryant, Lauren; Patterson, Jeremy A. 2013. Effects of intermittent upper-body static presses during treadmill walking. Medicine and Science in Sports and Exercise, vol. 45:no. 5:pp 596-596:Supplement: 1 Meeting Abstract: 2504
Lippincott Williams & Wilkins
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