Mynavi Announces Survey Results: "Survey on Summer Fatigue and Work Conducted Among 20,000 Full-Time Employees"

Mynavi Corporation (Headquarters: Chiyoda-ku, Tokyo; President and Representative Director, CEO: Shunsuke Awai) announced the results of its "Survey on Summer Fatigue*1 and Work Conducted Among 20,000 Full-Time Employees," which targeted full-time employees aged 20 to 59. *1 In this survey, "summer fatigue" refers to a state of feeling fatigued, experiencing decreased motivation, or having physical discomfort due to factors such as summer-specific heat and humidity, and temperature differences between indoor and outdoor environments. It is not a medical diagnosis but is based solely on the respondents' own perceptions.

【TOPICS】

◆Approximately 40% of full-time employees experienced "summer fatigue" last year. Symptoms of summer fatigue included "feeling strong lethargy/fatigue" and "lack of motivation/decreased motivation" (Figures 1, 2).

◆Of those who experienced summer fatigue last year, 64.4% responded that "summer fatigue affected their work." This included comments such as "work efficiency decreased due to reduced concentration" and "lack of appetite led to lack of motivation and inability to think clearly" (Figure 3).

◆About 70% of those who experienced summer fatigue thought about "wanting to take time off work," but the actual rate of taking leave was less than 40%. The most desired workplace system for summer fatigue was "a system and atmosphere that makes it easy to take time off when feeling unwell" (Figures 4, 5).

◆Only about 30% of companies implement summer fatigue measures for their employees. These measures include "heatstroke prevention measures," "appropriate air conditioning temperature settings," and "providing an environment for hydration" (Figure 6).

◆Approximately 40% of full-time employees experienced "summer fatigue" last year. Symptoms of summer fatigue included "feeling strong lethargy/fatigue" and "lack of motivation/decreased motivation."

When full-time employees aged 20 to 59 were asked about their experience with summer fatigue, 56.5% reported having experienced it, exceeding half of the respondents. Furthermore, when asked about their experience last year, 38.1% responded that they had experienced summer fatigue, indicating that it is a common physical change for working individuals. Among the specific symptoms reported by those who experienced summer fatigue last year, "feeling strong lethargy/fatigue" (51.0%) was the most common, followed by about 40% reporting symptoms related to behavior and motivation, such as "feeling a lack of motivation/decreased motivation" (40.8%). (Figures 1, 2).

【Figure 1】

【Figure 2】

◆Of those who experienced summer fatigue last year, 64.4% responded that "summer fatigue affected their work." This included comments such as "work efficiency decreased due to reduced concentration" and "lack of appetite led to lack of motivation and inability to think clearly."

When those who experienced summer fatigue last year were asked about its impact on their work, 64.4% reported that it "affected their work." There were no significant differences by age group, with over 60% in their 20s, 30s, and 40s feeling the impact on their work, suggesting that the effects are recognized across a wide range of age groups. Specific impacts included "work efficiency decreased due to reduced concentration," "lack of appetite led to lack of motivation and inability to think clearly," as well as responses such as "inability to sleep at night and decreased work efficiency" and "feeling unwell during commuting or work, leading to a slower pace than usual." These findings suggest that summer fatigue can potentially affect daily life and work performance. (Figure 3).

【Figure 3】

◆About 70% of those who experienced summer fatigue thought about "wanting to take time off work," but the actual rate of taking leave was less than 40%. The most desired workplace system for summer fatigue was "a system and atmosphere that makes it easy to take time off when feeling unwell."

Among those who experienced summer fatigue last year, 70.2% thought about "wanting to take time off work." However, only 38.1% of those who wanted to take time off had actually done so for summer fatigue, meaning over 60% did not take leave despite feeling the need. These results suggest that a certain number of people continue to work while experiencing physical discomfort and decreased motivation. Furthermore, when those who had experienced summer fatigue in the past were asked about "desired summer fatigue measures" at their workplace, "a system and atmosphere that makes it easy to take time off when feeling unwell" (36.6%) was the most common response, followed by "creating an environment that facilitates hydration (e.g., installing water servers)" (36.3%). Measures related to daily health management and work styles were ranked highly, indicating a demand for improvements in the immediate workplace environment rather than just special initiatives. (Figures 4, 5). 【Figure 4】

【Figure 5】

◆Only about 30% of companies implement summer fatigue measures for their employees. These measures include "heatstroke prevention measures," "appropriate air conditioning temperature settings," and "providing an environment for hydration."

When mid-career recruitment managers were asked about the implementation of summer fatigue measures for employees, only 32.7% responded that they were "implementing" them, while about 70% were not taking any measures. The measures being implemented by companies included initiatives aimed at employee health management, such as "heatstroke prevention measures," "appropriate air conditioning temperature settings," and "providing an environment for hydration," as well as responses like "distribution of beverages and salt-replenishing foods" and "relaxation of dress code regulations." While some companies are working on improving the immediate workplace environment, as indicated by the desired summer fatigue measures, there may be a gap between these efforts and employee needs. (Figure 6).

【Figure 6】

【Survey Analyst's Comment】

This survey revealed that summer fatigue is impacting work performance, including work efficiency and concentration. In particular, a certain number of people who feel the need to take time off due to physical discomfort from summer fatigue are not actually taking leave, and there is a reality of people working while experiencing discomfort. This situation not only affects individuals but could also impact the overall productivity of the business. Furthermore, many voices called for improvements in the daily work environment, such as "a system and atmosphere that makes it easy to take time off" and "an environment that facilitates hydration" as summer fatigue measures. Improving the environment and introducing flexible work styles are considered important not only for preventing performance decline due to summer fatigue but also for creating a more comfortable workplace. Additionally, "heatstroke" is also cited as a factor affecting summer work. While summer fatigue and heatstroke are not necessarily the same, basic measures such as hydration and ensuring breaks are common to both. Summer is a period when multiple health risks, including heatstroke in addition to summer fatigue, increase. Addressing these risks by improving the work environment and promoting flexible work styles is crucial for supporting employee health maintenance and stable performance. Akari Asahina, Researcher, Mynavi Career Research Lab.

【Survey Overview】

"Survey on Summer Fatigue and Work Conducted Among 20,000 Full-Time Employees"

○ Survey Period: June 1, 2026 (Mon) - June 5, 2026 (Fri)

○ Survey Method: Internet survey

○ Survey Target:

Full-time employees: Full-time employees nationwide aged 20-59 belonging to companies with 3 or more employees.

Companies: Business owners, executives, or company employees nationwide belonging to companies with 3 or more employees, who are in charge of mid-career recruitment and conducted recruitment activities in the previous month or plan to do so in the next 3 months.

○ Survey Organization: Conducted by Mynavi.

○ Valid Responses: Full-time employees: 20,045; Companies: 829.

* Due to rounding, the total may not be 100%.

<Details of survey results here>

https://career-research.mynavi.jp/reserch/20260706_112289/