The Assessment of Total Energy Expenditure During a 14-Day In-Season Period of Professional Rugby League Players Using the Doubly Labelled Water Method.
Rugby League is a high-intensity collision sport competed over 80 min. Training loads are monitored to maximize recovery and assist in the design of nutritional strategies although no data are available on the total energy expenditure (TEE) of players. We therefore assessed resting metabolic rate (RMR) and TEE in six Super League players over 2 consecutive weeks in-season including one game per week. Fasted RMR was assessed followed by a baseline urine sample before oral administration of a bolus dose of hydrogen (deuterium2H) and oxygen (18O) stable isotopes in the form of water (2H218O). Every 24 hr thereafter, players provided urine for analysis of TEE via DLW method. Individual training load was quantified using session rating of perceived exertion (sRPE) and data were analyzed using magnitude-based inferences. There were unclear differences in RMR between forwards and backs (7.7 ± 0.5 cf. 8.0 ± 0.3 MJ, respectively). Indirect calorimetry produced RMR values most likely lower than predictive equations (7.9 ± 0.4 cf. 9.2 ± 0.4 MJ, respectively). A most likely increase in TEE from Week 1 to 2 was observed (17.9 ± 2.1 cf. 24.2 ± 3.4 MJ) explained by a most likelyincrease in weekly sRPE (432 ± 19 cf. 555 ± 22 AU), respectively. The difference in TEE between forward and backs was unclear (21.6 ± 4.2 cf. 20.5 ± 4.9 MJ, respectively). We report greater TEE than previously reported in rugby that could be explained by the ability of DLW to account for all match and training-related activities that contributes to TEE.
James Cameron
JC
Morehen
Warren Jeremy
WJ
Bradley
Jon
J
Clarke
Craig
C
Twist
Catherine
C
Hambly
John Roger
JR
Speakman
James Peter
JP
Morton
Graeme Leonard
GL
Close
D000273:Adipose Tissue / Q000378:metabolism; D000284:Administration, Oral; D056352:Athletes; D001481:Basal Metabolism; D015992:Body Mass Index; D002153:Calorimetry, Indirect; D002149:Energy Intake; D004734:Energy Metabolism; D005538:Football; D006801:Humans; D006859:Hydrogen / Q000008:administration & dosage / Q000032:analysis; D010101:Oxygen Consumption; D010103:Oxygen Isotopes / Q000008:administration & dosage / Q000032:analysis; D014867:Water / Q000008:administration & dosage*
D010103:Oxygen Isotopes; D014867:Water; D006859:Hydrogen
energy; metabolism; nutrition; physical performance