Validation of a crane scale for the assessment of portable isometric mid-thigh pulls

Urquhart, Michael, Bishop, Chris ORCID: https://orcid.org/0000-0002-1505-1287 and Turner, Anthony N. ORCID: https://orcid.org/0000-0002-5121-432X (2018) Validation of a crane scale for the assessment of portable isometric mid-thigh pulls. Journal of Australian Strength and Conditioning, 26 (5) . ISSN 1836-649X [Article]

Abstract

The aim of the present study was to compare the validity and reliability of an affordable crane scale for measuring peak force during an isometric mid-thigh pull (IMTP); it may then provide a viable device to test with if a force plate is unattainable. Eight recreationally active males (age: 24 ± 2.98 years, height 178 ± 7.25 cm, mass 84.9 ± 20.16 kg) performed five IMTP trials with one-minute rest, the two largest outliers were discarded leaving three scores used in the analysis providing 24 data points for comparison. Intraclass Correlation Coefficient (ICC) and Coefficient of Variation (CV) demonstrated strong levels of reliability (ICC = 0.97; CV = 3.3% and ICC = 0.93; CV = 4.9%) for force plate (FP) and crane scale (CS) respectively. The CS showed good construct validity against the FP (ICC = 0.94; CV 4.4%) with the CS having a systematic bias of 49.99±161.37 Newtons. Coaches should consider the crane scale as a valid, reliable and affordable alternative to the FP if one is not available to them. It is quick and easy to set up; requiring a box, ratchet strap, crane scale and pulling handle. This method provides an alternative to one-repetition max testing typically used in facilities where expensive measuring devices are unavailable.

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