This study performed focus group interviews with 54 firefighters in four states in the United States to assess the needs for design of firefighters’ personal protective equipment. Firefighters’ responses indicate three major issues to be considered for improved mobility, comfort and safety: 1) consideration of human factors, 2) sizing and fit, and 3) integrity of protection in the interface between protective equipment and turnout ensemble. Ergonomic design issues were identified through firefighters’ responses about their limited mobility of the head and arms while wearing helmet and self-contained breathing apparatus (SCBA), restricted access to coat pockets, back pain and soreness while wearing SCBA. Sizing and fit issues such as the excessive length and bulkiness of glove fingers were identified as a major concern regarding fire gloves resulting in limited mobility and dexterity, negatively effecting firefighters’ work efficiency and safety. The integrity of protection in the interface between turnout ensemble, gloves and boots was reported as an important consideration for firefighter comfort, mobility and protection against heat hazards. Possible design solutions were also discussed.

This study investigated the impact of weight magnitude and distribution of body armour and carrying loads on military personnel's walking patterns and comfort perceptions. Spatio-temporal parameters of walking, plantar pressure and contact area were measured while seven healthy male right-handed military students wore seven different garments of varying weight (0.06, 9, 18 and 27 kg) and load distribution (balanced and unbalanced, on the front and back torso). Higher weight increased the foot contact time with the floor. In particular, weight placement on the non-dominant side of the front torso resulted in the greatest stance phase and double support. Increased plantar pressure and contact area observed during heavier loads entail increased impact forces, which can cause overuse injuries and foot blisters. Participants reported increasingly disagreeable pressure and strain in the shoulder, neck and lower back during heavier weight conditions and unnatural walking while wearing unbalanced weight distributed loads. This study shows the potentially synergistic impact of wearing body armour vest with differential loads on body movement and comfort perception. Practitioner Summary: This study found that soldiers should balance loads, avoiding load placement on the non-dominant side front torso, thus minimising mobility restriction and potential injury risk. Implications for armour vest design modifications can also be found in the results.

This study identified acceptable range of physical attributes (form factors, weight, volume and contact area) of wearable computing devices (WCD) on different body areas in relation to human factors, through human performance tests with 41participants. Findings of this study discovered that there is a different level of threshold to discomfort on each part of the body; Forearm has the smallest estimated mean of acceptable maximum weight of WCD followed by shirt pocket and collar area. On the other hand, front waist and back waist, when placed on one side, showed significantly higher estimated means of acceptable maximum weight of WCD than any other areas. Similar data trend was found in acceptable maximum volume and contact area of WCD. Body movement and posture influence the users’ comfort, as the weight of WCD can cause unhealthy posture over time, and increased energy expenditure, which may cause orthopedic problems and discomfort. Practitioner summary: This study discovered that in carrying wearable computing devices (WCD), there is a different level of threshold to discomfort on each part of the body, as evidenced by significantly different acceptable maximum weight, volume and contact area of WCD on different body part.

This study investigates firefighters’ perception of the protective turnout ensemble, more specifically, the level of satisfaction for a set of commonly performed body movements. Five hundred sixteen male and female firefighters completed our online survey. The current study identifies (1) the level of satisfaction with the fit of the turnout ensemble, (2) perceived reasons for discomfort and movement restriction in areas with low satisfaction, and (3) gender-specific fit issues. Female firefighters showed significantly lower satisfaction with the fit and functionality of the turnout ensemble in multiple areas than males. Common fit issues such as a stiff or oversized neckline and inappropriate location of knee pads, tightness in the lower pant leg, and inaccessibility of pockets that affect male and female firefighters are addressed. This study offers important implications to industry and academia involved in the study of protective clothing to increase the mobility, safety, and comfort of today's firefighters.