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The Journal of Sports Medicine and Physical Fitness 2000 June;40(2):145-9

lingua: Inglese

Cardiorespiratory and metabolic responses during straight and bent knee cycling

Mandroukas K., Angelopoulou N., Christoulas K., Vrabas I. S.

From the Ergoph­y­sio­lo­gy Labor­a­to­ry Depart­ment of Phys­i­cal Edu­ca­tion and ­Sports Sci­enc­es Aris­to­te­lian Uni­ver­sity o f Thes­sal­o­ni­ki, ­Greece


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Back­ground. ­This ­study exam­ined the influ­ence of ­knee ­angle on the car­di­o­res­pir­a­to­ry ­system load­ing dur­ing sub­max­i­mal and max­i­mal sta­tion­ary ­cycle ergom­e­try.
Meth­ods. Experi­men­tal ­design and par­tic­i­pants: eight­een ­untrained wom­en (age: 21±1.88 years, ­weight: 57±5.75 kg, ­height: 165±5.03 cm, val­ues are ­mean±SD) vol­un­teered as sub­jects and under­went two-­cycle ergom­e­ter incre­men­tal (Jaeg­er ER900) ­tests: 1) ­straight ­knee (180°), 2) ­bent ­knee (140°). Meas­ures: oxy­gen ­uptake (VO2), ven­ti­la­tion (VE) and res­pir­a­to­ry ­exchange ­ratio (RER) ­were meas­ured con­tin­u­ous­ly dur­ing ­each ­test ­using an ­open cir­cuit spi­rom­e­try and ­blood lac­tate con­cen­tra­tion was deter­mined by ­means of an enzy­mat­ic meth­od.
­Results. Com­par­ing ­cycling ­with “­straight ­knee” to ­cycling ­with “bent ­knee” at 50 W, ­heart ­rate (HR), VE and VO2 ­were sig­nif­i­cant­ly high­er (10.6%, 12.5%, 17.8%). At 100 W, ­blood lac­tate was sig­nif­i­cant­ly low­er (10.8%) ­while VO2 and RER was high­er (5.5%, 7.1%). Dur­ing max­i­mal exer­cise, the ­total exer­cise ­time was sig­nif­i­cant­ly long­er (11.2%) and VE, VO2 and HR ­were sig­nif­i­cant­ly high­er dur­ing ­cycling ­with “­straight ­knee” com­pared to ­cycling ­with “­bent ­knee”. No sig­nif­i­cant dif­fer­ence in ­peak lac­tate was evi­dent ­between the two sit­ting posi­tions.
Con­clu­sions. The ­results of ­this ­study indi­cate ­that ­cycling ­with ­bent ­knee ­requires low­er oxy­gen ­uptake ­while ped­al­ing ­with ­straight ­knee is the ­only way to ­reach VO2max dur­ing ­cycle test­ing, ­since the car­di­o­res­pir­a­to­ry ­system is ful­ly ­taxed.

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