UMIN-CTR Clinical Trial

Public title

Biomechanical Analysis of the Bench Press Exercise

Acronym

Biomechanical Analysis of the Bench Press Exercise

Scientific Title

Biomechanical Analysis of the Bench Press Exercise

Scientific Title:Acronym

Biomechanical Analysis of the Bench Press Exercise

Region

Japan

Condition

Healthy adult males

Classification by specialty

Adult

Classification by malignancy

Others

Genomic information

NO

Narrative objectives1

1. To examine the relationships between the load lifted and ground reaction forces acting on the feet, bench reaction forces acting on the lower scapular region, and lower-limb joint torques and powers by varying the load across several levels within each participant, thereby providing foundational knowledge to help improve bench press performance.

2. To analyze ground reaction forces acting on the feet at several load levels within each participant and clarify the relationship between the load lifted and the coefficient of friction required to prevent slipping between the shoe sole and the floor (required coefficient of friction: RCOF), as well as the distribution of the directions of frictional forces required in the plane of the shoe sole. This will provide foundational knowledge to help prevent accidents caused by foot slipping during the bench press and support the development of slip-resistant shoe soles.

Basic objectives2

Others

Basic objectives -Others

To clarify the relationships between the load lifted during the bench press and reaction forces at the feet and trunk support region, lower-limb joint mechanical parameters, and frictional requirements for preventing foot slipping.

Trial characteristics_1

Trial characteristics_2

Developmental phase

Primary outcomes

Ground reaction forces acting on the feet; bench reaction forces acting on the lower scapular region; ankle, knee, and hip joint torques and powers; the required coefficient of friction (RCOF); and the distribution of angles representing the direction of frictional forces.

Key secondary outcomes

Study type

Observational

Basic design

Randomization

Randomization unit

Blinding

Control

Stratification

Dynamic allocation

Institution consideration

Blocking

Concealment

No. of arms

Purpose of intervention

Type of intervention

Interventions/Control_1

Interventions/Control_2

Interventions/Control_3

Interventions/Control_4

Interventions/Control_5

Interventions/Control_6

Interventions/Control_7

Interventions/Control_8

Interventions/Control_9

Interventions/Control_10

Age-lower limit

18

years-old

<=

Age-upper limit

39

years-old

>=

Gender

Male

Key inclusion criteria

Men aged 18-39 years at the time of informed consent.
Individuals without any disease or disability that interferes with daily activities or exercise.
Individuals with at least one year of consistent resistance training experience who have performed the bench press at least once per week over the past six months.
Individuals who know and can report their bench press one-repetition maximum (1RM), defined as the maximum weight successfully lifted for one repetition with proper form and without assistance within the past three months.
Individuals who can perform the bench press using the prescribed technique and follow the instructions of the research staff.
Individuals who have received a sufficient explanation of the purpose and procedures of the study, understand this information, and voluntarily provide written informed consent to participate.

Key exclusion criteria

Individuals who are currently receiving medical treatment, have been advised by a physician to restrict high-intensity exercise, or have a history of a disease that may affect their ability to perform high-intensity exercise safely.
Individuals with symptoms that may compromise the safe performance of high-intensity exercise, such as chest pain, palpitations, syncope, marked shortness of breath during exercise, or dizziness.
Individuals who, within the past six months, have experienced an injury or pain, undergone surgery, or received treatment involving the neck, shoulders, elbows, wrists, spine, hips, knees, ankles, or other relevant anatomical regions that may affect their ability to perform the exercise tasks in this study.
Individuals for whom the timing, lifting technique, or successful completion of their reported one-repetition maximum (1RM) attempt is unclear, making it difficult to safely determine the experimental loads based on the reported 1RM.
Individuals who experience pain during lifting, lift their buttocks off the bench, or receive lifting assistance from a spotter during the warm-up or practice trials.
Individuals who experience chest pain, dizziness, or palpitations before measurement, or whose blood pressure and pulse measurements after seated rest show a systolic blood pressure of >= 160 mmHg, a diastolic blood pressure of >= 100 mmHg, or a pulse rate of >= 100 beats/min, with at least one of these thresholds still met upon repeat measurement after at least five additional minutes of rest.

Target sample size

40

Name of lead principal investigator

1st name	Takeshi
Middle name
Last name	Yamaguchi

Organization

Tohoku University

Division name

Graduate School of Engineering

Zip code

980-8579

Address

Aramaki-aza-aoba 6-6-01, Sendai, Miyagi

TEL

022-795-6897

Email

takeshi.yamaguchi.c8@tohoku.ac.jp

Name of contact person

1st name	Takeshi
Middle name
Last name	Yamaguchi

Organization

Tohoku University

Division name

Graduate School of Engineering

Zip code

980-8579

Address

Aramaki-aza-aoba 6-6-01, Sendai, Miyagi

TEL

022-795-6897

Homepage URL

Email

takeshi.yamaguchi.c8@tohoku.ac.jp

Institute

Tohoku University

Institute

Department

Personal name

Organization

Tohoku University

Organization

Division

Category of Funding Organization

Other

Nationality of Funding Organization

Co-sponsor

Name of secondary funder(s)

Organization

Research Ethics Committee, Tohoku University

Address

2-1-1, Katahira, Aoba-ku, Sendai, Miyagi, Japan

Tel

N/A

Email

tuhrp-soudan1@grp.tohoku.ac.jp

Secondary IDs

NO

Study ID_1

Org. issuing International ID_1

Study ID_2

Org. issuing International ID_2

IND to MHLW

Institutions

Date of disclosure of the study information

2026

Year

10

Month

26

Day

URL releasing protocol

Publication of results

Unpublished

URL related to results and publications

Number of participants that the trial has enrolled

Results

Results date posted

Results Delayed

Results Delay Reason

Date of the first journal publication of results

Baseline Characteristics

Participant flow

Adverse events

Outcome measures

Plan to share IPD

IPD sharing Plan description

Recruitment status

Preinitiation

Date of protocol fixation

2026

Year

10

Month

01

Day

Date of IRB

Anticipated trial start date

2026

Year

11

Month

02

Day

Last follow-up date

2028

Year

12

Month

30

Day

Date of closure to data entry

Date trial data considered complete

Date analysis concluded

Other related information

This cross-sectional study examines the relationship between lifting load and biomechanical measures during the bench press exercise. Participants perform bench presses under multiple load conditions based on their self-reported one-repetition maximum (1RM). Ground reaction forces, reaction forces exerted by the bench on the body, and body movements are measured to evaluate the required coefficient of friction between the feet and the floor, lower-limb joint torques, and other biomechanical measures. These analyses aim to characterize the mechanics of body support during the bench press exercise.

Registered date

2026

Year

10

Month

19

Day

Last modified on

2026

Year

10

Month

19

Day

Link to view the page

Value
https://center6.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000072503