Palmar pressure distribution during push-up exercise.
BACKGROUND
Doing repetitive push-ups is among the most common exercise for the upper body and shoulder stabiliser muscle strength training. However, adverse effects such as neck pain, back pain, palmar pain and wrist pain have been reported. To date, to our knowledge, palmar pressure when performing push-ups has not been previously reported. We hypothesised that various hand positions during push-ups may provide different palmar pressures.


METHODS
Bilateral palmar pressures were recorded in ten individual volunteers. All the subjects were set up for doing push-ups in five positions of the hand. Peak palmar pressure was recorded by Emed pressure platform system (Novel GmBH, Munich, Germany). The palm was divided into the following five anatomic regions, viz. thenar, lunate, hypothenar, metacarpals and fingers. Statistical comparison between the five positions of the hand was analysed using the analysis of variance test.


RESULTS
A distribution of the mean peak pressure of the lunate and hypothenar areas were relatively higher than the other areas in both standby and full-elbow flexion positions. At the palmar position 30 cm wider than the shoulder width, the palmar pressure revealed significantly higher peak pressure in the lunate area in the standby and fully-flexed elbow positions (p-value is less than 0.05). At the palmar position 10 cm narrower than the shoulder width, palmar pressure showed significantly higher peak pressure in the hypothenar area only in the fully-flexed elbow position.


CONCLUSIONS
The information regarding palmar pressures while performing push-ups in different hand positions may be used as a guideline for exercise modification, especially in injured athletes.
Chuckpaiwong
B
B
Orthopaedic Surgery Department, Siriraj Hospital, Mahidol University, 2 Prannok Street, Bangkok 10600, Thailand. chuck003@gmail.com
Harnroongroj
T
T
D000328:Adult; D056352:Athletes; D015444:Exercise / Q000502:physiology*; D006225:Hand / Q000033:anatomy & histology* / Q000502:physiology*; D006801:Humans; D008297:Male; D015233:Models, Statistical; D009119:Muscle Contraction / Q000502:physiology*; D009132:Muscles / Q000473:pathology; D005082:Physical Exertion / Q000502:physiology*; D011312:Pressure; D013314:Stress, Mechanical