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The Journal of Sports Medicine and Physical Fitness 2000 Settembre;40(3):223-32

lingua: Inglese

Intra-abdom­i­nal pres­sure and row­ing: the ­effects of inspir­ing ver­sus expir­ing dur­ing the ­drive

Manning T. S., Plowman S. A., Drake G., Looney M. A., Ball T. E.

Department of Kinesiology and Physical Education, Northern Illinois University, DeKalb, IL, USA


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Background. The lum­bar ver­te­brae of row­ers are sub­jected to ­high lev­els of ­shear and com­pres­sion at mid-­drive, but ­intra-abdom­i­nal pres­sure (IAP) may par­tial­ly neu­tral­ize ­these forc­es. IAP fluc­tu­ates ­with breath­ing. ­This ­study com­pared the IAP ­between inspir­ing dur­ing the ­drive and expir­ing dur­ing the ­drive.
Methods. Experimental ­design: ­ten vol­un­teers per­formed one 5×2-min­ute rep­e­ti­tion ­test ­while ispir­ing dur­ing the ­drive and one 5×2-min­ute rep­e­ti­tion ­test ­while expir­ing dur­ing the ­drive on a row­ing ergom­e­ter. The ­five ­work ­rates ­were: 100, 125, 150, 175 and 200 ­watts at 22, 24, 26, 28 and 30 ­strokes per min­ute, respec­tive­ly. Measures: the move­ment of the ­body ­while row­ing was ana­lyzed ­using a posi­tion sen­sor, and IAP was meas­ured ­using a pres­sure trans­duc­er cath­e­ter.
Results. A 2×5 repeat­ed meas­ures anal­y­sis of var­i­ance ­showed ­that ­there was a sig­nif­i­cant inter­ac­tion for the depen­dent vari­a­ble mid-­drive IAP (p<0.05), ­with the mid-­drive IAP increas­ing at a great­er ­rate ­while expir­ing dur­ing the ­drive rel­a­tive to inspir­ing dur­ing the ­drive. Across ­work ­rate, the ­mid-­drive IAP and min­i­mal IAP ­were sig­nif­i­cant­ly high­er ­while expir­ing dur­ing the ­drive ­than inspir­ing dur­ing the ­drive (p<0.05). ­Across breath­ing pat­tern, the min­i­mal IAP, max­i­mal IAP, aver­age ­change in IAP and mid-­drive IAP ­increased sig­nif­i­cant­ly ­with ­work ­rate (p<0.05).
Conclusions. The ­data ­show ­that expir­ing dur­ing the ­drive ­leads to a great­er mid-­drive IAP ­than inspir­ing dur­ing the ­drive.

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