GRIP (GRIP) - 04.11.18

Overview | Description | Applications | Operations | Results | Publications | Imagery

ISS Science for Everyone

Science Objectives for Everyone
The GRIP experiment studies the long-duration spaceflight effects on the abilities of human subjects to regulate grip force and upper limbs trajectories when manipulating objects during different kind of movements: oscillatory movements, rapid discrete movements and tapping gestures.
Science Results for Everyone
Information Pending

The following content was provided by J. L. Thonnard, and is maintained in a database by the ISS Program Science Office.
Information provided courtesy of the Erasmus Experiment Archive.
Experiment Details


Principal Investigator(s)
J. L. Thonnard, Institute of Neuroscience-COSY, Brussels, Belgium

Joseph McIntyre, College de France, Paris, France
V. Hayward, Canada
P. Lefevre, Belgium
A. Smith, Canada
S. Stramigoli, Netherlands
A. Wing, United Kingdom

European Space Agency (ESA), Noordwijk, Netherlands

Sponsoring Space Agency
European Space Agency (ESA)

Sponsoring Organization
Information Pending

Research Benefits
Earth Benefits, Space Exploration, Scientific Discovery

ISS Expedition Duration
February 2018 - August 2018; -

Expeditions Assigned

Previous Missions
Information Pending

^ back to top

Experiment Description

Research Overview
Microgravity provides a unique environment to study dexterous manipulation. The grip force/load force coordination is adapted to a 1G Earth environment, and it is observed that grip force control exhibits characteristics such as up/down asymmetries in peak acceleration and grip force, and is maintained during short-term exposure to microgravity during parabolic flight. The GRIP experiment studies the long-term adaptation of grip force/load force coordination (effect of weight vs mass, optimization of movement kinematics and dynamics, and grip force during controlled collisions), and to study the interaction between cognitive and proprioceptive cues, with respect to control of grip force and movement kinematics, for “upward” vs. “downward” movements.

Information Pending

^ back to top


Space Applications
Data from the GRIP experiments may also be used to identify potential hazards for astronauts as they move between gravitational environments. These studies could also contribute to the design and control of intelligent haptic interfaces to be used in challenging environments such as deep space, planets and their moons, or asteroids.

Earth Applications
The GRIP experiment targets specific questions about the effects of gravity on dexterous manipulation that cannot be addressed in the normal terrestrial environment. The research proposed in this project contributes to the understanding of how the human nervous system controls movement both on the ground and in the microgravity environment of space.

^ back to top


Operational Requirements and Protocols
Three full pre-flight Baseline Data Collection (BDC) sessions with minimum 15 days between sessions in any time within Launch -180 days and Launch day.
• Three full in-flight sessions: session #1 No Later Than (NLT) Flight Day 30 (FD30), session #2 FD90 (+/-15 days), session #3 FD165 (+/-15 days). Only 2 full in-flight sessions for missions shorter than 120 days. Additional testing is requested during first 10 days on-orbit, which are not needed if the first full session is planned NLT FD14. Here 1st session assumed NLT FD14.
• Minimal requirement: at least 2 full in-flight sessions are required, session #1 NLT FD30, session #2 NET FD75 with preference for FD165 (+/-15 days).
• Two full post-flight BDC sessions in immediate post-flight period: Return +2 days (acceptable up to R+4 days), R+12 days (+/-2 days). Reduced session on R+0 or R+1 days (R+0 preferred).
• Two full post-flight BDC sessions in late post-flight period: R+30 days or later with minimum 2 days between sessions.
• USOS crews as subject. Subject minimum stay on ISS is 3 months, preferred 6 months or more.

Subjects should perform no more than 1 continuous hour of test trials at a time for this and similar experiments. This means that a single session needs to be divided into sub-sessions with other activities in-between (30 minutes or more). Sessions should not be scheduled after physically strenuous activities or activities that may provoke motion sickness (e.g. EVA during flight). The experiment must not be performed during orbital manuvers of the ISS, it is sufficient to pause during the time of the actual boost. The science team needs to receive information on any medications taken in the period 2 days before until experiment execution. Photos of experimental conditions and subjects are highly desired for each session. Video recording for at least 1 minute of each session is required for documenting experimental conditions. Crew Medical Restraint System (CMRS) to be used for GRIP experiment in COLUMBUS when subject is in supine position.
For experiment set-up: the restraints system, target frame and manipulandum, and cabling is installed. The alignment and test procedures are carried out.

For experiment trials:  the subject takes either a seated or supine position using the straps provided by the GRIP chair. The subject then performs a set of movements while holding the manipulandum. Three protocols are defined for the experiment trials: movement dynamics, reference frames, and collisions.

For experiment stowage:  continuous real-time data downlink is not required, and can continue during los of signal (LOS). Real-time downlink of at least 1 trial from each sub-session is needed to assure experiment success. Deferred downlink of data following inflight sessions shall be provided no later than 2 weeks after the session.

^ back to top

Decadal Survey Recommendations

Information Pending

^ back to top

Results/More Information

Information Pending

^ back to top

Related Websites

^ back to top