Somatosensory nerve function, measured by vibration thresholds in asymptomatic tennis players: a pilot study.

Author:Harrisson, Sarah
Position:Letter to the editor
 
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Dear Editor-in-chief,

Tennis players are vulnerable to injury in their upper limbs due to the repetitive exposure to racket vibrations and torsional forces during play, leading to musculoskeletal adaptations in the dominant arm including some evidence of changes in nerve function (Colak et al., 2004). Vibration is a sensitive technique for diagnosing mild pathology in clinically asymptomatic participant groups. It has been used in participants with various musculoskeletal disorders (Laursen et al., 2006) (Tucker et al., 2007) showing widespread and bilateral increases in vibration threshold. Tests of somatosensory function by vibration will be abnormal prior to changes in nerve conduction velocity. Thus vibration testing in a sub-clinical group of participants may a more sensitive measure of nerve function compared to nerve conduction by electrodiagnostic testing.

The aim of this pilot study was to conduct an exploratory investigation to establish whether tennis players have a reduction in their somatosensory nerve function compared to non-tennis playing controls. It also set out to compare the somatosensory nerve function of the dominant compared to the non-dominant upper limb in tennis players.

Healthy tennis players (males, n = 8, females, n = 2, mean age 22 years) and control non-tennis playing volunteers (males, n = 6, females, n = 4, mean age 22 years) were recruited on an opportunistic basis from a tennis centre in London UK. Participants were excluded if they had any history of neurological impairment, serious injury or fracture or any arthritic condition affecting the upper limbs, cervical or thoracic spine. Control participants were excluded if it was deemed that they played a sport where there was exposure to repetitive use of the upper body.

Ethical approval was obtained from the University College London Ethics Committee and all participants gave written informed consent. A preliminary clinical examination was carried out on all participants followed by vibration threshold testing. Vibration testing was carried out using a Vibrameter (Somedic AB, Stockholm, Sweden). The tissue displacement range was 0.1-400pm and had a frequency of 100Hz. The vibration threshold was determined by the method of limits as standardised by Goldberg and Lindblom (1979). The tester was not blinded to whether tennis players or controls were being tested, but was familiarised with the equipment and testing procedure. The coefficient of variation for...

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