The key points summarizing the report.

• Wearing Relive Shirts and Pants improves indicators such as blood flow velocity, body surface temperature, fatigue, balance ability, range of motion, muscle hardness, and muscle strength.
• The improvement effects were confirmed through both objective and subjective indicators. 
• The effects after 2 weeks of wearing suggest greater effects than single wear.
• Over 95% of participants felt improved ease of movement and fatigue relief.
• No safety issues such as side effects were observed. 

1. Test Design

This test was conducted to verify the effect on body composition of wearing Relive Shirts and Pants. It was a crossover trial (with a 2-week washout period) comparing a group wearing Relive Shirts/Pants and a group wearing placebo shirts/pants of the same material without attached mineral sheets, before wearing, after wearing, and 2 weeks later. The participants were 14 healthy men (7) and women (7) with discomfort or pain in their neck, shoulders, and lower back.

2. Selection and Exclusion Criteria for Subjects

1) Subjects

The subjects were 14 healthy Japanese men and women between the ages of 30 and 59 who met the selection criteria for this trial, voluntarily applied to participate in the trial, received adequate explanation of the content, and agreed in writing to participate in the trial.

2) Selection Criteria

– Healthy (defined in this trial as having no serious organ disorders or specific illnesses, no treatment for them, and not undergoing any drug therapy. Whether a person is healthy is determined based on their own declaration at the start of the trial.)

– Those with discomfort in their neck, shoulders, and lower back, and who feel their body is fatigued 

– Those whose middle finger is 10 cm or more from the floor when bending forward

– Those who do not go to chiropractors, gyms, yoga, etc.

– Those from whom written consent can be obtained

– Those who do not meet participant exclusion criteria

3) Exclusion Criteria

– Those with a medical history of treating illnesses such as heart failure and myocardial infarction

– Those excluded due to illnesses (atrial fibrillation, arrhythmia, liver disorder, kidney disorder, cerebrovascular disorder, rheumatism, diabetes, lipid disorder, hypertension, other chronic illnesses, etc. or who are receiving treatment) 

– Those regularly using hospital visits and pharmaceuticals (including herbal medicines)

– Those who are pregnant, lactating, or likely to become pregnant during the trial period

– Those with flexible bodies

– Those who go to chiropractors, gyms, yoga, etc. 

– Those who have participated in other clinical trials within the past month or are currently participating

– Those otherwise deemed inappropriate as trial subjects by the principal trial physician

4) Ethics Review Committee and Participant Consent

This trial was conducted in accordance with the Declaration of Helsinki after obtaining approval on October 18, 2022 from the Ethics Review Committee of Kobayashi Ginza Clinic Medical Corporation (Chairman: Hirofumi Okamura), with sufficient explanation of the trial provided to participants and written consent obtained.

3. Test Products

The test products were Relive Shirts and Pants (Relive Co., Ltd.) (Image 1). The special prints contain kneaded in tourmaline, which through negative ions generated by the tourmaline is thought to stimulate meridians and muscles and regulate the body by smoothing the flow of electrical signals from the brain. 

The Relive shirts are made of elastic 100% polyester material, with special prints on the inside around the left and right abdomen, special prints on the inside of the left and right shoulders, and special prints around the left and right inferior scapular. The Relive pants are made of a polyester-cotton blend, with special prints on the outside lower left and right abdomen and special prints on the left and right sacrum on the back.

[Image 1: Relive Shirts and Pants]

4. Test Organization 

The test was conducted by TFC Lab Co., Ltd. at the TFC Lab measurement room.

5. Test Schedule

This test was conducted over 6 weeks from October 28 to December 10, 2022. The test schedule was as shown in Table 2.

[Table 2: Test Schedule]

* Weeks 2-4 were a washout period with no wearing. 

* If adverse events occur requiring follow-up, participants will come to the affiliated medical institution.

* Follow-up observations were for 2 weeks after completion of the test.

6. Method of Using Test Products

Before use, commercially available 100% polyester T-shirts and pants were worn. After use and at 2 weeks later, T-shirts and pants of the same material without prints like the test products were worn directly against the skin. Only regular shorts were worn at the time of measurement. 

7. Test Details

The test was a double-blind trial with the participants and measurers being unaware of the assignments. Someone not involved in the study randomly determined whether subjects wore the test product or placebo in the first half (weeks 0-2) and second half (weeks 4-6). After explanation of the study and obtaining consent, participants did a pre-wearing questionnaire, changed clothes, and were measured. Measurements included range of motion with left and right neck lateral bending measured by digital goniometer, left and right shoulder external rotation (lateral fist raise) photographed with camera, forward bend measured by digital trunk forward flexometer, left and right knee range of motion measured as distance from floor to top of knee with metal height measure YS-OA; muscle hardness of left and right neck, left and right shoulders, and left and right lower back measured by muscle hardness meter NEUTONE TDM-N1; jump height measured by jump meter MD; left and right grip strength measured by digital dynamometer; back muscle strength measured by digital back muscle dynamometer Back-D TKK5402; lifting measured as distance from desk to bottom of 18.9 kg cardboard box lifted horizontally with arms alone; balance from sitting to standing measured by balance analyzer zaRitz BM-220; fatigue level measured as time until stopping red dot disappears by flicker value meter Model II (automatic) TKK-501C; blood flow velocity photographed with blood flow scope TOKU Capillaro to measure subsurface capillary blood flow in nail of left ring finger; body surface temperature photographed with Thermal Imaging Camera PerfectPrime IR0005. The same measurements were done after changing clothes after wearing. 

8. During the Test Period

Subjects were asked to maintain their normal lifestyle as much as possible and wore a smartwatch for 24 hours, entering sleep score, deep sleep ratio, average stress score, maximum stress score, and minimum stress score in a web diary every day. The test product and placebo were each to be worn for 8 hours or more per day.

9. Evaluation Method

Evaluations were comparisons over time before, after, and 2 weeks after wearing the test product and placebo, and comparisons between the groups. For objective evaluation, blood flow velocity evaluated subsurface capillary blood flow in 1 second; body surface temperature evaluated temperature at set points on the back; fatigue level evaluated with flicker value time until disappearing red dot reappears; balance from sitting to standing evaluated balance from sitting to standing; left and right neck range of motion evaluated angle when horizontally turning neck from facing forward; left and right arm range of motion evaluated angle when horizontally raising arms with hands on thighs; forward bend evaluated distance bar pushed down from 0 cm point to 20 cm point with knees unbent; left and right knee range of motion evaluated distance from floor to top of knee; left and right neck, shoulder, and lower back muscle hardness evaluated hardness at set points on muscles; jump height evaluated distance jumped from floor; grip strength evaluated strength of gripping with hand; back muscle strength evaluated pulling strength; lifting height evaluated distance from desk to cardboard box. During the test period, sleep score, deep sleep ratio, average stress score, maximum stress score, and minimum stress score were evaluated by having subjects wear a smartwatch for 24 hours. For subjective evaluation, the following 5 items were evaluated on a 9-step scale of “1 point: Hard to move – 5 points: Neutral – 9 points: Easy to move”: ease of movement of body, neck, shoulders, lower back, and knees. The following 3 items were evaluated on a 9-step scale of “1 point: Feel – 5 points: Neutral – 9 points: Do not feel”: fatigue, inability to sleep soundly, and body feeling cold.

10. Statistical Method

Data were summarized as descriptive statistics (mean, standard deviation) and evaluated with ANOVA before wearing, after wearing, and 2 weeks later. Comparisons over time and between groups were tested with paired t-test and Student’s t-test, respectively. Statistical software Statcel4 was used with a significance level of 5%. 

11. Conflicts of Interest

There are no conflicts of interest between the contracting company and implementing institution.

12. Results 

The test started with 14 subjects (mean age 46.1±7.2 years; male mean age 46.3±8.1 years; female mean age 46.0±6.9 years) and was completed by all 14 subjects with no dropouts. Since there were no adverse events or unsuitable cases among the completers, all 14 subjects were included in the analysis.

1) Changes in Objective Indicators (Image 2, Table 3)

For blood flow velocity, the test product group went from 43.43 μl/sec before wearing to 65.05 μl/sec after wearing and 64.90 μl/sec at 2 weeks later, while the placebo group went from 43.43 μl/sec before wearing to 42.00 μl/sec after wearing and 40.60 μl/sec at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.  

For body surface temperature, the test product group went from 28.34°C before wearing to 28.74°C after wearing and 29.40°C at 2 weeks later, while the placebo group went from 28.34°C before wearing to 28.31°C after wearing and 28.33°C at 2 weeks later, with a significant difference seen at 2 weeks later.

For fatigue level (flicker value), the test product group went from 37.50 before wearing to 39.71 after wearing and 41.11 at 2 weeks later, while the placebo group went from 37.50 before wearing to 38.11 after wearing and 38.79 at 2 weeks later, with a significant difference seen at 2 weeks later.

For standing from sitting balance, the test product group went from 54.71 before wearing to 56.79 after wearing and 58.29 at 2 weeks later, while the placebo group went from 54.71 before wearing to 53.29 after wearing and 52.71 at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.   

For left neck range of motion, the test product group went from 61.85deg before wearing to 72.87deg after wearing and 84.75deg at 2 weeks later, while the placebo group went from 61.85deg before wearing to 67.73deg after wearing and 68.88deg at 2 weeks later, with significant differences seen at 2 weeks later.

For right neck range of motion, the test product group went from 58.41deg before wearing to 69.13deg after wearing and 75.24deg at 2 weeks later, while the placebo group went from 58.41deg before wearing to 59.73deg after wearing and 60.18deg at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For left arm range of motion, the test product group went from 102.57deg before wearing to 123.57deg after wearing and 135.50deg at 2 weeks later, while the placebo group went from 102.57deg before wearing to 109.00deg after wearing and 106.57deg at 2 weeks later, with a significant difference seen at 2 weeks later.

For right arm range of motion, the test product group went from 98.93deg before wearing to 123.79deg after wearing and 134.57deg at 2 weeks later, while the placebo group went from 98.93deg before wearing to 105.86deg after wearing and 106.36deg at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.  

For forward bend, the test product group went from 12.96cm before wearing to 6.46cm after wearing and 2.96cm at 2 weeks later, while the placebo group went from 12.96cm before wearing to 13.28cm after wearing and 11.26cm at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For left knee range of motion, the test product group went from 96.24cm before wearing to 102.44cm after wearing and 107.02cm at 2 weeks later, while the placebo group went from 96.24cm before wearing to 95.60cm after wearing and 99.23cm at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For right knee range of motion, the test product group went from 97.96cm before wearing to 103.36cm after wearing and 108.79cm at 2 weeks later, while the placebo group went from 97.96cm before wearing to 97.93cm after wearing and 99.71cm at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For left neck muscle hardness, the test product group went from 25.18 before wearing to 20.25 after wearing and 17.68 at 2 weeks later, while the placebo group went from 25.18 before wearing to 24.46 after wearing and 25.36 at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For right neck muscle hardness, the test product group went from 24.61 before wearing to 21.71 after wearing and 19.50 at 2 weeks later, while the placebo group went from 24.61 before wearing to 23.68 after wearing and 26.39 at 2 weeks later, with a significant difference seen at 2 weeks later.

For left shoulder muscle hardness, the test product group went from 26.79 before wearing to 20.77 after wearing and 19.64 at 2 weeks later, while the placebo group went from 26.79 before wearing to 26.39 after wearing and 27.96 at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.  

For right shoulder muscle hardness, the test product group went from 27.75 before wearing to 24.25 after wearing and 21.46 at 2 weeks later, while the placebo group went from 27.75 before wearing to 27.79 after wearing and 28.36 at 2 weeks later, with a significant difference seen at 2 weeks later.

For left lower back muscle hardness, the test product group went from 20.61 before wearing to 16.79 after wearing and 15.46 at 2 weeks later, while the placebo group went from 20.61 before wearing to 20.14 after wearing and 20.18 at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For right lower back muscle hardness, the test product group went from 20.39 before wearing to 16.53 after wearing and 15.68 at 2 weeks later, while the placebo group went from 20.39 before wearing to 20.18 after wearing and 19.96 at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For jump power, the test product group went from 21.50cm before wearing to 24.14cm after wearing and 27.36cm at 2 weeks later, while the placebo group went from 21.50cm before wearing to 20.57cm after wearing and 21.86cm at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For left grip strength, the test product group went from 25.96kg before wearing to 27.61kg after wearing and 30.11kg at 2 weeks later, while the placebo group went from 25.96kg before wearing to 26.08kg after wearing and 26.89kg at 2 weeks later, with a significant difference seen at 2 weeks later.

For right grip strength, the test product group went from 28.03kg before wearing to 29.24kg after wearing and 31.29kg at 2 weeks later, while the placebo group went from 28.03kg before wearing to 27.84kg after wearing and 27.95kg at 2 weeks later, with a significant difference seen at 2 weeks later.

For back muscle strength, the test product group went from 58.46kg before wearing to 72.82kg after wearing and 78.09kg at 2 weeks later, while the placebo group went from 58.46kg before wearing to 61.18kg after wearing and 65.61kg at 2 weeks later, with significant differences seen after wearing and at 2 weeks later. 

For lifting height, the test product group went from 14.00cm before wearing to 28.50cm after wearing and 27.64cm at 2 weeks later, while the placebo group went from 14.00cm before wearing to 17.04cm after wearing and 19.52cm at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

[Table 3: Changes in Objective Indicators]

2) Changes in Subjective Indicators (Table 4)

For movement ease of body, the test product group went from 3.36 points before wearing to 4.43 points after wearing and 6.93 points at 2 weeks later, while the placebo group went from 3.36 points before wearing to 3.79 points after wearing and 3.71 points at 2 weeks later, with a significant difference seen at 2 weeks later.

For movement ease of neck, the test product group went from 3.07 points before wearing to 4.64 points after wearing and 6.79 points at 2 weeks later, while the placebo group went from 3.07 points before wearing to 3.21 points after wearing and 3.29 points at 2 weeks later, with significant differences seen after wearing and at 2 weeks later. 

For movement ease of shoulders, the test product group went from 2.57 points before wearing to 4.57 points after wearing and 6.57 points at 2 weeks later, while the placebo group went from 2.57 points before wearing to 3.00 points after wearing and 3.07 points at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For movement ease of lower back, the test product group went from 3.64 points before wearing to 4.64 points after wearing and 6.79 points at 2 weeks later, while the placebo group went from 3.64 points before wearing to 3.86 points after wearing and 4.00 points at 2 weeks later, with a significant difference seen at 2 weeks later.

For movement ease of knees, the test product group went from 4.00 points before wearing to 4.93 points after wearing and 6.64 points at 2 weeks later, while the placebo group went from 4.00 points before wearing to 4.00 points after wearing and 3.93 points at 2 weeks later, with significant differences seen after wearing and at 2 weeks later. 

For fatigue, the test product group went from 2.43 points before wearing to 3.64 points after wearing and 6.29 points at 2 weeks later, while the placebo group went from 2.43 points before wearing to 2.64 points after wearing and 2.93 points at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

For body feeling cold, the test product group went from 2.86 points before wearing to 4.93 points after wearing and 7.00 points at 2 weeks later, while the placebo group went from 2.86 points before wearing to 3.29 points after wearing and 3.71 points at 2 weeks later, with significant differences seen after wearing and at 2 weeks later.

[Table 4: Changes in Subjective Indicators]

Mean±standard deviation, n.s>0.05 *:p≦0.05, **:p<0.01

Before wearing 3.36 ± 1.55 3.36 ± 1.55 3.07 ± 1.27 3.07 ± 1.27 2.57 ± 1.28 2.57 ± 1.28

After wearing 4.43 ± 1.40 3.79 ± 1.63 4.64 ± 2.10 3.21 ± 1.19 4.57 ± 2.24 3.00 ± 1.57  

2 weeks later 6.93 ± 1.82 3.71 ± 1.73 6.79 ± 1.89 3.29 ± 1.33 6.57 ± 2.03 3.07 ± 1.44

Before-After 1.07 ± 1.64 0.43 ± 0.65 1.57 ± 2.10 0.14 ± 0.36 2.00 ± 2.25 0.43 ± 0.76

Before-2wks later 3.57 ± 2.21 0.35 ± 0.63 3.72 ± 1.98 0.22 ± 0.58 4.00 ± 2.25 0.50 ± 0.76

Before-After * * * n.s. ** n.s.

Before-2wks later ** n.s. ** n.s. ** *  

Before-After 

Before-2wks later

Before wearing 3.64 ± 1.55 3.64 ± 1.55 4.00 ± 1.18 4.00 ± 1.18 2.43 ± 1.02 2.43 ± 1.02

After wearing 4.64 ± 1.74 3.86 ± 1.56 4.93 ± 1.49 4.00 ± 1.24 3.64 ± 1.39 2.64 ± 1.01

2 weeks later 6.79 ± 1.48 4.00 ± 1.41 6.64 ± 1.82 3.93 ± 1.14 6.29 ± 1.73 2.93 ± 1.33

Before-After 1.00 ± 2.11 0.22 ± 0.43 0.93 ± 1.27 0.00 ± 0.39 1.21 ± 1.31 0.21 ± 0.43  

Before-2wks later 3.15 ± 2.11 0.36 ± 0.63 2.64 ± 1.82 -0.07 ± 0.27 3.86 ± 1.96 0.50 ± 0.94

Before-After n.s. n.s. * n.s. ** n.s.

Before-2wks later ** n.s. ** n.s. ** n.s.

Before-After

Before-2wks later   

Before wearing 2.86 ± 1.51 2.86 ± 1.51 

After wearing 4.93 ± 2.27 3.29 ± 1.59

2 weeks later 7.00 ± 1.62 3.71 ± 1.54

Before-After 2.07 ± 2.16 0.43 ± 0.65

Before-2wks later 4.14 ± 1.79 0.85 ± 0.77  

Before-After ** *

Before-2wks later ** **

Before-After

Before-2wks later

p-value: Between groups

0.01 

<0.01 

<0.01 0.07

** 

*

1.00 

0.01 *

<0.01 **

Fatigue: Points

Test Placebo

0.00 0.08

Change

p-value: Over time

0.00 0.03 

<0.01 <0.01

p-value: Between groups  

0.18 n.s. 0.01 *

<0.01 ** <0.01 **

Group Test Placebo 

Value

Item: Unit Body feeling cold: Points

<0.01 0.05 <0.01 0.34

Value

Change 

p-value: Over time

0.10 0.08 0.02

Item: Unit Lower back mobility: Points Knee mobility: Points

Group Test Placebo Test Placebo

p-value: Between groups

0.18 n.s. 0.02 * *

<0.01 ** <0.01 ** <0.01 **

0.02

0.02 0.16 0.01 0.05

<0.01 0.05 <0.01 0.19 <0.01 0.03

Value

Change

p-value: Over time  

0.03 0.03

Item: Unit Body lightness: Points Neck mobility: Points Shoulder mobility: Points  

Group Test Placebo Test Placebo Test Placebo

16

3) Objective and subjective indicators of sleep and stress

Looking at sleep score, there was a tendency for the sleep score to decrease when sleep duration was under 5.5 hours or over 8.5 hours. Therefore, sleep duration was limited to 5.5-8.5 hours for comparison between wearing the test product and placebo. The sleep score was 81.60 when wearing the test product, compared to 80.88 when wearing the placebo, 1.01 points higher when wearing the test product. 

The deep sleep ratio was 19.16% when wearing the test product compared to 18.63% when wearing the placebo, 0.50 percentage points higher when wearing the test product. 

The average stress score was 32.46 when wearing the test product compared to 33.87 when wearing the placebo, 1.12 points lower when wearing the test product.

The maximum stress score was 74.92 when wearing the test product compared to 77.23 when wearing the placebo, 2.05 points lower for the maximum when wearing the test product. 

The minimum stress score was 9.91 when wearing the test product compared to 10.83 when wearing the placebo, 0.59 points lower for the minimum when wearing the test product.

For the subjective evaluation “Inability to sleep soundly”, the test product wearing group increased 1.01 points from before wearing, while the placebo wearing group increased 0.15 points, with a significant difference seen.

[Table 5: Objective indicators of sleep and stress] 

Mean±standard deviation, n.s>0.05, *:p≦0.05, **:p<0.01

[Graph 3: Percent change in sleep and stress]

[Table 6: Subjective indicator of sleep]

13. Discussion 

This test implemented a 6-week double-blind trial comparing a group wearing Relive Shirts and Pants and a group wearing placebo shirts and pants of the same material without the special prints. Objective indicators were blood flow, body surface temperature, fatigue, balance, range of motion, muscle hardness, and muscle strength. The participants also completed a questionnaire themselves, and a smartwatch was worn during the test period to measure sleep and stress. 

Blood flow velocity increased by 49.8% after wearing and 49.4% at 2 weeks later. Compared to the placebo group, significant differences were seen after wearing and at 2 weeks later.  

Body surface temperature increased by 1.4% after wearing and 3.7% at 2 weeks later. A significant difference was seen compared to the placebo group at 2 weeks later.

Fatigue level increased by 5.9% after wearing and 9.6% (improved) at 2 weeks later. A significant difference was seen compared to the placebo group at 2 weeks later. 

For standing from sitting balance, sway decreases and stability increases as the trunk strengthens. Sway decreased by 3.8% after wearing and 6.5% at 2 weeks later. Significant differences were seen compared to the placebo group after wearing and at 2 weeks later. 

Range of motion was measured for the neck, shoulders, lower back, and knees. For the neck, left neck increased by 17.8% after wearing and 37.0% at 2 weeks later, while right neck increased by 18.4% after wearing and 28.8% at 2 weeks later, showing expanded range of motion for both. For the shoulders, with the motion of horizontally raising both arms, left arm increased by 20.5% after wearing and 32.1% at 2 weeks later, while right arm increased by 25.1% after wearing and 36.0% at 2 weeks later, showing expanded range of motion for both. For forward bend of the lower back, this decreased by -50.2% after wearing and -77.2% at 2 weeks later, indicating the body became more flexible. For the knees, with the motion of raising the legs upward without using the upper body, left knee increased by 6.4% after wearing and 11.2% at 2 weeks later, while right knee increased by 5.5% after wearing and 11.1% at 2 weeks later, showing expanded range of motion for both. These results confirm that wearing Relive Shirts and Pants improves range of motion of the neck, shoulders, lower back, and knees. Also, compared to the placebo group, significant differences were seen after wearing for all except the left neck and left arm, and at 2 weeks later for all items. 

Muscle hardness was measured at set points on the neck, shoulders, and lower back. For the neck, left neck decreased by -19.6% after wearing and -29.8% at 2 weeks later, while right neck decreased by -11.8% after wearing and -20.8% at 2 weeks later, indicating both sides became more flexible. For the shoulders, left shoulder decreased by -22.5% after wearing and 26.7% at 2 weeks later, while right shoulder decreased by -12.6% after wearing and -22.7% at 2 weeks later, indicating both sides became more flexible. For the lower back, left lower back decreased by -18.5% after wearing and -25.0% at 2 weeks later, while right lower back decreased by -18.9% after wearing and -23.1% at 2 weeks later, indicating both sides became more flexible. These results confirm that wearing Relive Shirts and Pants relaxes muscles. Also, compared to the placebo group, significant differences were seen after wearing for all except the right shoulder, and at 2 weeks later for all items. 

Muscle strength was measured by jump power, grip strength, back muscle strength, and lifting height. Jump power showed an increase of 12.3% before wearing and 27.2% at 2 weeks later, confirming both groups jumped higher. Grip strength increased by 6.4% after wearing and 16.0% at 2 weeks later for the left hand, and increased by 4.3% after wearing and 11.6% at 2 weeks later for the right hand, showing increased grip strength for both hands. Back muscle strength increased by 24.6% after wearing and 33.6% at 2 weeks later, indicating increased back muscle strength. For lifting height as an indicator of arm strength, this increased by 103.6% after wearing and 97.4% at 2 weeks later compared to before wearing, meaning subjects were able to lift the 18.9 kg cardboard box higher. These results confirm that wearing Relive Shirts and Pants increases muscle strength. Compared to the placebo group, significant differences were seen after wearing for all except left and right grip strength, and at 2 weeks later for all items.

Looking at the 2 weeks of wearing on sleep and stress, no significant differences were seen. However, the sleep score trended 1.3% higher and the deep sleep ratio trended 2.7% higher compared to the placebo group, with the sleep score increasing for 71.4% of participants. For the stress score, the average trended -3.3% lower, the maximum -2.7% lower, and the minimum -5.5% lower, with the average decreasing for 71.4% of participants. 

While the observation period this time was 2 weeks, long-term observation is considered a future research topic. 

Finally, for the subjective indicators by the participants themselves, 57.1% felt increased body lightness after wearing and 92.9% at 2 weeks later; 57.1% felt improved neck mobility after wearing and 100.0% at 2 weeks later; 71.4% felt improved shoulder mobility after wearing and 100.0% at 2 weeks later; 51.1% felt improved lower back mobility after wearing and 85.7% at 2 weeks later; 64.3% felt improved knee mobility after wearing and 92.9% at 2 weeks later; 57.1% felt reduced fatigue after wearing and 100.0% at 2 weeks later; and 78.6% felt less body coldness after wearing and 100.0% at 2 weeks later. On average, 63.2% felt a change after wearing and 95.9% felt a change at 2 weeks later. It appears that continuing to wear Relive during daily life caused them to feel changes in motion, fatigue, and body temperature.

14. Conclusion

Wearing Relive Shirts and Pants appears to improve blood circulation, which has the synergistic effect of reducing fatigue. In addition, trunk strengthening leads to expected improvements in range of motion and increased muscle strength. Continuous wearing appears superior to one-time wearing. During the test period, there were no complaints of physical abnormalities, and after a follow-up observation period of 2 weeks, there were still no complaints of physical abnormalities, confirming no safety issues.  

Test Conducting Organization

TFC Lab Co., Ltd.

Representative Director: Hirohisa Kojima

Supervising Physician

Kobayashi Ginza Clinic Medical Corporation Chairman & Kuno Ginza Clinic Director

Nobuyoshi Okamura