Progress and Prospects in Parkinson's Research/Symptoms/Freezing of gait

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Freezing of gait
Inability to initiate locomotion

The following references are relevant:-

Morris et al (2010)  Striding Out With Parkinson Disease: Evidence-Based Physical Therapy for Gait Disorders 

Maidan et al (2010)  Heart rate changes during freezing of gait in patients with Parkinson's disease 

Espay et al(2012) “On” state freezing of gait in Parkinson disease - A paradoxical levodopa-induced complication 

Further Research
References