Comparison of maximal aerobic capacity during running and lifting activities : research article

Christie, C.J. and Scott, P.A. (2005) Comparison of maximal aerobic capacity during running and lifting activities : research article. Ergonomics SA : Journal of the Ergonomics Society of South Africa, 17 (1). pp. 41-49. ISSN 1010-2728

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Abstract

Acknowledging the specificity of assessing maximal output, the purpose of this paper was to compare the physiological and perceptual responses during a traditional running activity and the common industrial task of lifting; both were taken to maximal effort. The responses of eight male participants were measured during both physical activities separated by at least five days: i) a progressive speed protocol (PSP) involved running on a treadmill at increasing speeds, starting at 10 km.h[superscript -1] and increasing by 1 km.h[superscript -1] every minute until exhaustion; ii) a progressive frequency protocol (PFP) required participants to lift a load of 20% body mass at increasing lifting frequencies, starting at one lift every 10s and reducing the time between lifts by 1s every minute until exhaustion. Physiological responses were measured using a portable on-line system, the K4b[superscript 2] (Cosmed(r)). "Central" perceptual measures were obtained every minute using the rating of perceived exertion (RPE) scale. Results: Responses increased progressively with augmented exercise intensity in both protocols; however, oxygen consumption and peak oxygen values were both lower during the lifting protocol compared to the running protocol. In contrast to the oxygen uptake responses, peak RER values were significantly higher during lifting (mean of 1.32) than running (mean of 1.18), while maximal heart rate and perceptual responses revealed no significant difference between the two protocols. These findings caution against using the 'traditional' treadmill protocol to assess the aerobic capacity of manual labourers involved in lifting, as it is evident that the traditional lower body protocol will indicate a higher capacity than the maximum capacity of an upper body activity, which could lead to manual labourers being taxed beyond acceptable limits.

Item Type:Article
Uncontrolled Keywords:physiological responses; perceptual responses; running; lifting; progressive speed protocol; PSP; treadmill; progressive frequency protocol; PFP; oxygen consumption; peak oxygen values; oxygen uptake; heart rate; aerobic capacity; upper body activity
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Human Kinetics & Ergonomics
ID Code:650
Deposited By:INVALID USER
Deposited On:04 May 2007
Last Modified:06 Jan 2012 16:18
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