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Int J Sports Med 2017; 38(07): 527-533
DOI: 10.1055/s-0043-102943
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Iso-duration Determination of D′ and CS under Laboratory and Field Conditions

Christoph Triska
1   Centre for Sport Science and University Sports, University of Vienna, Vienna, Austria
,
Bettina Karsten
2   Life and Sport Science, University of Greenwich, Chatham Maritime, United Kingdom of Great Britain and Northern Ireland
,
Alfred Nimmerichter
3   Sport and Exercise Sciences, University of Applied Sciences Wiener Neustadt, Wiener Neustadt, Austria
,
Harald Tschan
1   Centre for Sport Science and University Sports, University of Vienna, Vienna, Austria
› Author Affiliations
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Publication History



accepted after revision 19 January 2017

Publication Date:
17 May 2017 (online)

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Abstract

Whilst Critical Speed (CS) has been successfully translated from the laboratory into the field, this translation is still outstanding for the related maximum running distance (D′). Using iso-duration exhaustive laboratory and field runs, this study investigated the potential interchangeable use of both parameters, D′ and CS. After an incremental exercise test, 10 male participants (age: 24.9±2.1 yrs; height: 180.8±5.8 cm; body mass: 75.3±8.6 kg; V̇ ˙VO2peak 52.9±3.1 mL∙min−1∙kg−1) performed 3 time-to-exhaustion runs on a treadmill followed by 3 exhaustive time-trial runs on a-400 m athletics outdoor track. Field time-trial durations were matched to their respective laboratory time-to-exhaustion runs. D′ and CS were calculated using the inverse-time model (speed=D′/t+CS). Laboratory and field values of D′ and CS were not significantly different (221±7 m vs. 225±72 m; P=0.73 and 3.75±0.36 m∙s−1 vs. 3.77±0.35 m∙s−1, P=0.68), and they were significantly correlated (r=0.86 and 0.94). The 95% LoA were ±75.5 m and ±0.24 m∙s−1 for D′ and CS, respectively. Applying iso-durations provides non-significant differences for D′ and CS and a significant correlation between conditions. This novel translation method can consequently be recommended to coaches and practitioners, however a questionable level of agreement indicates to use D′ with caution.

 

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