Ovulation and equine body temperature and heart rate circadian rhythms

Evans, Joseph P.; Winget, C. M.; Roshia, C. De; Holley, Daniel C.

doi:10.1080/09291017609359502

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…Both the presence [1] and absence [3][4][5][6][7][8][9][10][11] of circadian rhythms have been observed in previous chronobiological research into haematological parameters in horses. In particular, in horses fed v ary ing diet s, som e st udies showed circadi an rhythmicity with nocturnal acrophases for PCV and Hb [9] and for WBC and PCV in others [4].…”

Section: Discussionmentioning

confidence: 99%

Different Periodicities of Some Haematological Parameters in Exercise-Loaded Athletic Horses and Sedentary Horses.

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Fazio

et al. 2001

JES

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The fundamental aim of chronobiological analysis methods in the field of sport physiology in the horse is to establish the time interval in which the organism gives the best performance. Since it is well known that numerous physiological parameters (electrocardiographic, haemogasanalytic and haemodynamic) vary during physical exercise and influence athletic potential considerably, we studied the periodic variations in the following haematological parameters at a different frequency in 12 horses (6 athletes and 6 sedentary): erythrocytes (RBC), total leukocyte count (WBC), haemoglobin (Hb), packed cell volume (PCV), platelets (PLT), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCHC). Some of the parameters studied showed periodicity at different frequencies both in athletic and sedentary horses: in athletic horsesinfradian (RBC, PCV), circadian (RBC, WBC, PCV), ultradian (RBC, WBC, Hb); in sedentary horses-infradian (RBC, Hb, PLT), circadian (RBC, PCV), ultradian (RBC, Hb). The results obtained, therefore, can suggest that physical exercise is an exogenous synchronizer which modulates the periodicity of the haematopoietic system and of the functions of the organs involved in athletic performance.

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Section: Discussionmentioning

confidence: 99%

Different Periodicities of Some Haematological Parameters in Exercise-Loaded Athletic Horses and Sedentary Horses.

Piccione

Assenza

Fazio

et al. 2001

JES

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“…The horse has the circadian rhythm in heart rate [5,16], and it is thought that the rhythm is apparently caused by the varia tion in autonomic nervous tone [16]. Then the frequency of AV block must also show the circadian rhythm if truly AV block is vagally induced.…”

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Diurnal Variation in Dropped Beats in Horses with a Second Degree Atrioventricular Block

Yamayai

Kubo

Amada

et al. 1993

JJES

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“…But most of their reports did not use the sta tistics method to analyze circadian rhythms. Only Evans estimated the periodicity of the body temperature and heart rate circadian rhythms by the cosiner method [4]. The cosiner analysis is useful to estimate whether the observed data is fitted to the circadian rhythm, namely, the known single period such as the 24-hour period [11].…”

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Criterion for Maximum Entropy Spectral Analysis of Heart Rate Diurnal Rhythm in a Horse

Yamaya

Kubo

Amada

et al. 1993

JJES

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The application of the maximum entropy spectral analysis to the chronotropisms of heart rate diurnal rhythm in a horse was examined. As the sampling interval and the order of the autoregressive model (model order) had to be determined before the estimate by maximum entropy method (MEM), these parameters were examined. As the results, 5-or 10-minute interval and N (the number of data)/2 for the estimate of over a 6-hour period and N/5 for that of the 1-to 6-hour period were adequate for the sampling interval and the model order. It was presumed that by the MEM using these parameters, the heart rate diurnal rhythm of this horse had approximately 1-, 4-, 5-, 9-, and 26-hour periods.

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Ovulation and equine body temperature and heart rate circadian rhythms

Cited by 11 publications

References 36 publications

Different Periodicities of Some Haematological Parameters in Exercise-Loaded Athletic Horses and Sedentary Horses.

Different Periodicities of Some Haematological Parameters in Exercise-Loaded Athletic Horses and Sedentary Horses.

Diurnal Variation in Dropped Beats in Horses with a Second Degree Atrioventricular Block

Criterion for Maximum Entropy Spectral Analysis of Heart Rate Diurnal Rhythm in a Horse

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