The Effects of Doming of the Diaphragm in Subjects With Short-Hamstring Syndrome: A Randomized Controlled Trial

in Journal of Sport Rehabilitation
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Taking into account the complex structure of the diaphragm and its important role in the postural chain, the authors were prompted to check the effects of a diaphragm technique on hamstring flexibility.


To evaluate the effects of the doming-of-the-diaphragm (DD) technique on hamstrings flexibility and spine mobility.


Randomized placebo-controlled trial.


University laboratory.


Sixty young adults with short-hamstring syndrome were included in this randomized clinical trial using a between-groups design.


The sample was randomly allocated to a placebo group (n = 30) or an intervention group (n = 30). Duration, position, and therapist were the same for both treatments.

Main Outcome Measures:

Hamstring flexibility was assessed using the forward-flexion-distance (FFD) and popliteal-angle test (PAT). Spinal motion was evaluated using the modified Schober test and cervical range of movement.


Twoway ANOVA afforded pre- to postintervention statistically significant differences (P < .001) in the intervention group compared with the placebo group for hamstring flexibility measured by the FFD (mean change 4.59 ± 5.66 intervention group vs 0.71 ± 2.41 placebo group) and the PAT (mean change intervention group 6.81 ± 8.52 vs placebo group 0.57 ± 4.41). Significant differences (P < .05) were also found in the modified Schober test (mean change intervention group –1.34 ± 3.95 vs placebo group 1.02 ± 3.05) and cervical range of movement. Significant between-groups differences (P < .05) were also found in all the variables measured.


The DD technique provides sustained improvement in hamstring flexibility and spine mobility.

The authors are with the Dept of Physiotherapy, University of Granada, Granada, Spain.

Address author correspondence to Marie Valenza at