为有效应对高温热浪天气，保障室外作业人员的健康与安全，仍需进一步明确夏季活动水平变化时室外作业人员的生理和心理响应特征。针对作业人员工作强度差异及工作与休息交替的两类典型情景，在夏季室外偏热环境下对16名受试者开展了不同活动水平变化下的人体热响应实验与现场问卷调研。通过对人体不同客观生理参数及主观热感知动态响应特征的分析，结果表明：当人员在室外偏热环境下进行不同强度的活动时，人体代谢率、心率以及休息阶段的平均皮肤温度间存在显著差异，而人员的主观热感知均无显著性差异。当活动状态改变时，人体平均皮肤温度的响应规律遵循指数函数变化；代谢率不仅受活动强度影响，还与环境温度密切相关。此外，基于典型相关性分析结果表明：当室外活动水平变化时，人体主观热感知与客观生理参数显著相关，其有效典型相关系数R₁（U₁，V₁）约为0.98，其中U₁和V₁即为人体生理响应和心理感知两组变量的第一对典型变量。对于客观生理参数的响应特性，心率和平均皮肤温度具有较高的典型负荷系数，可作为评估室外人体热状态的典型客观生理指标。对于主观热感知的响应特性，室外人员的整体热舒适程度主要取决于人员出汗感觉的变化。

To effectively address high-temperature heatwaves and ensure the health and safety of outdoor workers, the physiological and psychological responses of outdoor workers under varying summer activity levels requires further clarification. An experimental study involving 16 subjects was conducted in moderately hot outdoor summer environments, focusing on two typical scenarios: differences in work intensity and alternating work-rest cycles. Human thermal response experiments and on-site questionnaire surveys were performed under changing activity levels. Through analysis of objective physiological parameters and subjective thermal perception dynamics, significant differences are identified in metabolic rate, heart rate, and mean skin temperature during rest periods after different activity intensities. However, no significant differences are observed in subjective thermal perceptions. The variation pattern of mean skin temperature during activity transitions follows an exponential function. Metabolic rate is influenced not only by activity intensity but also by environmental temperature. Canonical correlation analysis reveals a significant correlation between subjective thermal perception and objective physiological parameters during outdoor activity changes, with an effective canonical correlation coefficient R₁ (U₁,V₁) of approximately 0.98. Here, U₁ and V₁ represent the first pair of canonical variables derived from the two sets of variables: physiological parameter responses and psychological perception responses. Regarding physiological parameter responses, heart rate and mean skin temperature show high canonical loadings, indicating their suitability as key indicators for assessing outdoor thermal states. For subjective response characteristics, outdoor workers' overall thermal comfort is primarily determined by variations in perspiration sensation.