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Annual Meeting Abstracts


Baker, J. S.; Bailey, D. M.; Williams, S.; Davies, B. FACSM

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Medicine & Science in Sports & Exercise: May 1999 - Volume 31 - Issue 5 - p S82
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Abstract 251

We compared data obtained during a modified 20 m aerobic shuttle run test with high intensity cycle ergometry. Male subjects (n = 16) were optimized for total body mass (TBM), and fat free mass (FFM). Capillary blood was obtained from a hyperaemic finger for the determination of whole blood lactate (La), pre and post exercise. Mean (± SD) age, body mass and stature of the group was 21.3 yrs (± 2.1), 85.2 kg (± 11.2) and 180.5 cm (± 7.7). Fat mass was calculated from body density values. The modified 20 m shuttle run protocol comprised of running between markers placed 15 m apart, at speed increases of 0.28 m.s−1 each minute. Heart rates were recorded using a short range telemetry system. Values of 176 ± 8 b.min−1 (TBM), 179 ± 6 b.min−1 (FFM) and 184 ± 6 b.min−1 were recorded for cycle ergometry, and shuttle running. Values for power outputs were 1288 ± 214.5W (Peak power output PPO TBM) and 1369 ± 239.1W (Peak power output PPO FFM). Modified shuttle run times were 76.5 ± 13.6 s. Paired t-tests were used to identify differences between loading procedures. Correlation techniques were applied to investigate relationships between ergometer protocols and running ability. Significant differences were found between TBM and FFM optimization protocols (p <0.01). Significant correlation's were found between PPO and shuttle run times (r = 0.80, p <0.01 TBM : r = 0.90, p <0.01 FFM). Blood lactate concentrations for all tests were correlated r = 0.61, p <0.01 (10.3 ± 6 mmol.L−1 TBM : 12.6 ± 5.2 mmol.L−1 FFM and 13.4 ± 7 mmol.L−1 for the running tests). These findings suggest that existing loading protocols for cycle ergometry may need to be reassessed. Increased PPO values resulting from decreased preceding loads and subsequent increased absolute load during optimization procedures for FFM, may maximise muscle contraction dynamics. The results also indicate that a modified shuttle run proved to be a viable protocol for the quantification of anaerobic running performance.

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American College of Sports Medicine; 46th Annual Meeting; Washington State; Convention & Trade Center; June 2-5, 1999

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© 1999 Lippincott Williams & Wilkins, Inc.