Reliability of DXA for the measurement of total and regional body composition in elite soccer players Fanchini M, Guido Rillo, Mattias Bruni, Carwyn Sharp AS Roma Football Club, Roma, ITA University of Verona, Faculty of Exercise and Sport Science, ITA; INTRODUCTION Dual-energy X-ray absorptiometry (DXA) is widely used for the assessment of total and regional body composition. Acquisition of the data can be done automatically with the in-built software however the software may under/overestimate regional parameters (i.e. legs). As such, the data may also be acquired by operator manual adjustment of the regions-of-interest (ROI) but the experience of the operator may influence the accuracy and reliability. In elite football monitoring leg muscle mass is relevant therefore operator adjustment may be required. The aim of this study was to examine the reliability of total and regional body composition when comparing automatic and manual ROI assessment performed by operators with different experience levels. METHODS Twenty-four elite soccer players (age 18 ± 1 yrs; height 179 ± 5 cm; body mass 72 ± 5 kg) from an Italian Serie-A team participated in a test-retest study. Tests were performed with Lunar iDXA (GE Healthcare Lunar, Madison, USA) and examined with in-built software (enCORE 17, GE Medical Systems Ultrasound & Primary Care Diagnostics, USA) on two different days. Total body fat mass (FM) and free fat mass (FFM) were examined as total body composition, and free fat mass of right and left legs (FFMR and FFML) were examined as regional body composition parameters. ROI were determined automatically (AROI) and by two operators with low and high experience (Low1 and High1). After two weeks, the operators were asked to do the analysis again (Low2 and High2) on the same images. Reliability was examined as Typical Error of Measurement (expressed as percentage, TEM) and Intraclass Correlation Coefficient (ICC). RESULTS The values were within the range 9.7-10.2 kg for FM, 58.8-59.5 kg for FFM, 10.3-12.8 kg for FFMR and 10.2-12.7 kg for FFML. The TEMs were within the range 2.0-2.4% for FM and 0.8-0.9% for FFM for all the assessment. The TEMs for FFMR were 1.4, 4.1, 1.2, 1.6, 1.3 % for AROI, Low1, High1, Low2 and High2 respectively. The TEMs for FFML were 2.0, 3.9, 1.1, 1.3, 1.1 % for AROI, Low1, High1, Low2 and High2 respectively. Low1 showed higher values of TEM for FFMR and FFML. The ICC were within the range 0.99-1.00 for FM, 0.82-0.98 for FFMR, 0.83-0.98 for FFML and 0.99 for FFM. DISCUSSION The reliability of total and regional body parameters found in the present group of elite soccer players was similar to the values reported in the literature (1, 2). No significant difference was found between reliability parameters in FM, FFM however the lowest reliability found in Low1 in FFMR and FFML suggested the low experience of the operator have influenced the DXA results in his first assessment. Even if operators are familiarized with ROI customization they need experience to provide reliable outcomes. 1. Hart NH, Nimphius S, Spiteri T, Cochrane JL, Newton RU. J Sports Sci Med, 2015, 14, 620-626 2. Bilsborough JC, Greenway K, Opar D, Livingstone S, Cordy J, Coutts AJ. J Sports Sci, 2014, 19, 1821-8
Reliability of DXA for the measurement of total and regional body composition in elite soccer players
Fanchini Maurizio
;
2022-01-01
Abstract
Reliability of DXA for the measurement of total and regional body composition in elite soccer players Fanchini M, Guido Rillo, Mattias Bruni, Carwyn Sharp AS Roma Football Club, Roma, ITA University of Verona, Faculty of Exercise and Sport Science, ITA; INTRODUCTION Dual-energy X-ray absorptiometry (DXA) is widely used for the assessment of total and regional body composition. Acquisition of the data can be done automatically with the in-built software however the software may under/overestimate regional parameters (i.e. legs). As such, the data may also be acquired by operator manual adjustment of the regions-of-interest (ROI) but the experience of the operator may influence the accuracy and reliability. In elite football monitoring leg muscle mass is relevant therefore operator adjustment may be required. The aim of this study was to examine the reliability of total and regional body composition when comparing automatic and manual ROI assessment performed by operators with different experience levels. METHODS Twenty-four elite soccer players (age 18 ± 1 yrs; height 179 ± 5 cm; body mass 72 ± 5 kg) from an Italian Serie-A team participated in a test-retest study. Tests were performed with Lunar iDXA (GE Healthcare Lunar, Madison, USA) and examined with in-built software (enCORE 17, GE Medical Systems Ultrasound & Primary Care Diagnostics, USA) on two different days. Total body fat mass (FM) and free fat mass (FFM) were examined as total body composition, and free fat mass of right and left legs (FFMR and FFML) were examined as regional body composition parameters. ROI were determined automatically (AROI) and by two operators with low and high experience (Low1 and High1). After two weeks, the operators were asked to do the analysis again (Low2 and High2) on the same images. Reliability was examined as Typical Error of Measurement (expressed as percentage, TEM) and Intraclass Correlation Coefficient (ICC). RESULTS The values were within the range 9.7-10.2 kg for FM, 58.8-59.5 kg for FFM, 10.3-12.8 kg for FFMR and 10.2-12.7 kg for FFML. The TEMs were within the range 2.0-2.4% for FM and 0.8-0.9% for FFM for all the assessment. The TEMs for FFMR were 1.4, 4.1, 1.2, 1.6, 1.3 % for AROI, Low1, High1, Low2 and High2 respectively. The TEMs for FFML were 2.0, 3.9, 1.1, 1.3, 1.1 % for AROI, Low1, High1, Low2 and High2 respectively. Low1 showed higher values of TEM for FFMR and FFML. The ICC were within the range 0.99-1.00 for FM, 0.82-0.98 for FFMR, 0.83-0.98 for FFML and 0.99 for FFM. DISCUSSION The reliability of total and regional body parameters found in the present group of elite soccer players was similar to the values reported in the literature (1, 2). No significant difference was found between reliability parameters in FM, FFM however the lowest reliability found in Low1 in FFMR and FFML suggested the low experience of the operator have influenced the DXA results in his first assessment. Even if operators are familiarized with ROI customization they need experience to provide reliable outcomes. 1. Hart NH, Nimphius S, Spiteri T, Cochrane JL, Newton RU. J Sports Sci Med, 2015, 14, 620-626 2. Bilsborough JC, Greenway K, Opar D, Livingstone S, Cordy J, Coutts AJ. J Sports Sci, 2014, 19, 1821-8
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