Stupfel M, Gourlet V, Perramon A, Mérat P, Putet G, Court L
Environmental Nuisances Research Group, French National Institute of Health and Medical Research, Le Vésinet.
Am J Physiol. 1995 Jan;268(1 Pt 2):R253-65. doi: 10.1152/ajpregu.1995.268.1.R253.
Carbon dioxide emission (VCO2) was computed every 20 min from continuous CO2 concentration recordings taken during 3-30 consecutive days, in strictly controlled environmental conditions, in 54 OF1 mice, 99 Japanese quail, 66 Sprague-Dawley rats, 50 Hartley guinea pigs, 7 chicks, for 7-15 days on 2 Cynomolgus monkeys, and for 24 h on 7 premature infants. This VCO2 shows circadian and ultradian oscillations that were analyzed for frequencies and amplitudes in light-dark 12-h alternation (LD 12:12), continuous light (LL), and continuous dark (DD). Circadians were not always identified or were often masked in LL or DD (mostly in guinea pigs, quail, and rats), while ultradians (tau > or = 40 min) were found in all species, at every time, and in all light regimens. Analysis of variance and chi 2 show significant (P < 0.001) interspecies differences for ultradian (1.07 < tau < 1.40 h) intervals and for circadian and ultradian VCO2 amplitudes. Relationships between ultradian and circadian VCO2 oscillations differ according to the species, ultradians appearing as an entity characteristic for each endotherm species.
二氧化碳排放量（VCO2）是根据连续3至30天记录的二氧化碳浓度计算得出的，这些记录是在严格控制的环境条件下，对54只OF1小鼠、99只日本鹌鹑、66只斯普拉格-道利大鼠、50只哈特利豚鼠、7只小鸡进行7至15天的测量，对2只食蟹猴进行7至15天的测量，对7名早产儿进行24小时的测量。这种VCO2呈现出昼夜节律和超昼夜节律振荡，在12小时明暗交替（LD 12:12）、持续光照（LL）和持续黑暗（DD）条件下分析了其频率和振幅。在LL或DD条件下（主要在豚鼠、鹌鹑和大鼠中），昼夜节律并不总是能被识别或常常被掩盖，而超昼夜节律（τ≥40分钟）在所有物种、任何时间以及所有光照条件下均能被发现。方差分析和卡方检验表明，超昼夜节律（1.07＜τ＜1.40小时）的间隔以及昼夜节律和超昼夜节律的VCO2振幅在种间存在显著差异（P＜0.001）。超昼夜节律和昼夜节律的VCO2振荡之间的关系因物种而异，超昼夜节律表现为每个恒温物种的特征。
