D'silva L A, Cardew A, Qasem L, Wilson R P, Lewis M J
College of Engineering, Swansea University, Swansea, UK -
J Sports Med Phys Fitness. 2015 Oct;55(10):1049-57. Epub 2014 Jun 19.
Accurate estimation of energy expenditure (EE) is important in human and animal behavior analysis. Rate of oxygen consumption (VO2) reflects EE during aerobic metabolism but is not always convenient. Alternative methods include heart rate (HR) and overall dynamic body acceleration (ODBA). A favorable ODBA-VO2 relationship was recently reported but the strength of association between VO2, ODBA, HR and its variability (HRV) is less clear.
Fifteen young (23±4 years) healthy males of similar aerobic fitness (maximal oxygen uptake, VO2max=49.7±8.5 mL·kg(-1)·min(-1)) carried out progressive maximal exercise. ODBA, HRV and V̇O2 were recorded continuously. Relationships between ODBA, HRV and V̇O2 were explored using regression methods.
VO2 was strongly related to ODBA and RR during walking (R=0.45,0.30; P<5x10(-5)) and running (R=0.60,0.38; P<5x10(-5)). HRV was related to VO2 during walking only (R=0.11-0.26; 0.005<P<5x10(-5)). A strong ODBA-RR relationship during walking (R=0.45; P<5x10(-5)) was diminished during running (R=0.25; P<5x10(-5)).
ODBA is a stronger proxy for EE than RR or HRV, especially during running gaits. HRV is weakly related to EE and cannot be recommended for its estimation. ODBA and RR are relatively easily measured but careful attention to gait is imperative as it changes these relationships markedly.
准确估计能量消耗（EE）在人类和动物行为分析中很重要。耗氧率（VO2）反映有氧代谢过程中的EE，但并不总是方便测量。替代方法包括心率（HR）和整体动态身体加速度（ODBA）。最近有报道称ODBA与VO2之间存在良好的关系，但VO2、ODBA、HR及其变异性（HRV）之间的关联强度尚不清楚。
15名年轻（23±4岁）、有氧适能相似（最大摄氧量，VO2max=49.7±8.5 mL·kg(-1)·min(-1)）的健康男性进行递增式最大运动。连续记录ODBA、HRV和V̇O2。使用回归方法探讨ODBA、HRV和V̇O2之间的关系。
在步行（R=0.45,0.30；P<5×10(-5)）和跑步（R=0.60,0.38；P<5×10(-5)）过程中，VO2与ODBA和RR密切相关。仅在步行过程中HRV与VO2相关（R=0.11-0.26；0.005<P<5×10(-5)）。步行过程中ODBA与RR的强相关性（R=0.45；P<5×10(-5)）在跑步过程中减弱（R=0.25；P<5×10(-5)）。
ODBA比RR或HRV更能有效代表EE，尤其是在跑步步态期间。HRV与EE的关系较弱，不建议用于EE估计。ODBA和RR相对容易测量，但必须注意步态，因为步态会显著改变这些关系。
