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Unilateral lower limb suspension: integrative physiological knowledge from the past 20 years (1991-2011)
K J Hackney1, L L Ploutz-Snyder
1Department of Exercise Science, Syracuse University, Syracuse, NY 13244, USA. kjhackne@syr.edu
European Journal of Applied Physiology
|May 3, 2011
Summary
Unilateral lower limb suspension (ULLS) effectively models microgravity
Area of Science:
- Physiology
- Human Performance
- Space Medicine Analogs
Background:
- Unilateral lower limb suspension (ULLS) was introduced in 1991 as a ground-based human model.
- ULLS simulates microgravity effects by unloading one lower limb.
- It is widely used to study skeletal muscle unloading.
Purpose of the Study:
- To review physiological findings from ULLS studies.
- To emphasize neuromuscular, musculoskeletal, and circulatory changes.
- To compare ULLS with bed rest and assess exercise efficacy.
Main Methods:
- ULLS involves participants using crutches and a raised shoe.
- This method unloads one lower limb, simulating reduced gravity.
- The review synthesizes data from ULLS and bed rest studies.
Main Results:
- ULLS reveals deleterious effects of unloading on skeletal muscle.
- Significant alterations in human performance and physiological functions are observed.
- Exercise can mitigate some negative consequences of unloading.
Conclusions:
- ULLS is a valuable analog for microgravity research.
- Understanding unloading effects is crucial for human health.
- Exercise interventions show promise in counteracting unloading impacts.
