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But the most important factor for the higher threshold temperatures of thermoeffector responses in females is progesterone. In general, female mammals are smaller than males and have a larger surface-to-mass ratio, which favours heat loss. Notice, that in many human studies, data refers to the range of internal body temperature between thermoregulatory thresholds (Core interthreshold zone, CIZ), and not to the ambient temperature range, as it defines the concept of TNZ. Experiments with rodents have demonstrated a higher threshold temperature for cold-induced thermogenic response in females compared to males (27). Below the LCT, facultative heat production is activated to maintain thermal balance.
This decrease in weight maintenance calories is 10–15% below what is predicted solely on the basis of alterations in fat and lean mass 11, 12. Yet, the average U.S. adult gains only 500–1000 g of weight (approximately 2000–2500 kcal of stored energy) per year (more pronounced in older individuals, African-Americans, Native-Americans, and Hispanic-Americans) 6, despite ingestion of approximately 900,000–1,000,000 kcal/year. If energy intake and output were not regulated by interlocking control mechanisms that work concordantly to maintain energy stores, then a very small persistent change in input relative to output would, over time, lead to substantial gain or loss of stored calories.
Many studies support that sex, body shape and composition, and age are the most important factors influencing thermal perception and thermal preference (53–55). Considering that animals seek for thermal comfort, behavioral thermal strategies are probably initiated even before ambient temperature reaches the limits of the TNZ. The specific contribution of each channel to acute noxious heat sensing is probably dynamic and influenced by the metabolic status of the tissue. Their activation, in coordination with other ion channels, convert thermal stimuli into propagated electrical activity.
Peripheral vasoconstriction and reduced blood flow to extremities, such as the tail and paws in rodents and hands and feet in human, is an efficient mechanism to reduce heat loss in cold environments (66). Mammals also increase or decrease food consumption and locomotor activity to maintain thermal balance in cold and warm environments, respectively (3, 69, 70). The preference of females for warmer ambient temperatures might also be due to central mechanisms controlling whole body thermal homeostasis, i.e., sex-dependent control of the temperature set point(s) in the brain. Sex differences in sensitivity to cold and warm temperatures exist in rodents as well as in humans. In contrast, cold and heat nociceptors convey noxious temperatures and mostly do not adapt (37). Thus, it was shown that in lightly dressed women, metabolic heat production increases when air temperature decreases below 31 °C, while in men the LCT was found at 28.5 °C (32).
Regardless of whether or not changes in REE account for 10–15% of the changes in TEE following weight loss, NREE is clearly the compartment of energy expenditure that is most affected by changes in body weight 11, 20 consistent with the importance of physical exercise in the successful maintenance of reduced weight 9, 21. Poor or insufficient sleep disrupts hormone production, including testosterone, hampering your body’s ability to generate heat and sustain metabolic health. Enhancing testosterone levels in men with deficiency can improve body composition, increase resting metabolic rate, and potentially boost thermogenesis. On the flip side, elevated testosterone within a healthy range can increase thermogenic activity, supporting higher energy expenditure and lean body composition. Interestingly, it has been described that adipose tissue has higher metabolic rate per kilogram in women, which agrees with the initiation of cold-induced thermoregulatory mechanisms at warmer temperatures and the increased expression of genes involved in mitochondrial function (168). Further research is warranted to investigate in humans the effectiveness of chronic stimulation of cold temperature signalling pathways on fat loss, glucose and lipid homeostasis and evaluate the threshold differences between both sexes.
It acts on metabolic pathways that increase heat production, effectively turning your body’s internal fuel into warmth instead of storage. Thermogenesis is your body’s ability to produce heat, a key mechanism for maintaining temperature and burning energy. Understanding how testosterone affects your body’s heat production can unlock insights into your metabolism and overall health.

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