Cilj istraživanja bio je usporediti parametre
aerobnog kapaciteta, izmjerene pomoću dva testa
progresivnog opterećenja na pokretnom sagu različitog
trajanja u trkačica. Deset trkačica različitih disciplina
podvrgnute su dvama progresivnim testovima opterećenja
do iscrpljenja na pokretnom sagu (ST: porast brzine saga 1
kmh /min; KT: porast brzine saga 1 kmh /30 s).
spiroergometrijski podaci usrednjeni su na
vremenski period od 30 s, te je drugi ventilacijski
(anaerobni) prag (P) određen metodom.
Postignuta maksimalna brzina trčanja (v : 17,1±1,4
km/h; v : 19,4±1,2 km/h) kao i brzina trčanja pri P(v :
12,3±1,5 km/h; v : 13,8±1,5 km/h) značajno su se
razlikovale između protokola (p<0.05), tj. v i v bile su
obrnuto proporcionalne ukupnom trajanju testa, odnosno
duljini trajanja pojedinog stupnja opterećenja.
Maksimalna frekvencija srca bila je značajno niža u KT
testu (FS : 194,9±6,8/min, FS : 190,4±6,0/min;
p=0,03) što se može pripisati inerciji kardiovaskularnog
sustava, dok se FS pri P nije značajno razlikovala između
protokola (FS : 178,2±8,7/min, FS : 175,2±10,9/min;
p>0,05). Maksimalni primitak kisika nije se razlikovao
između testova (VO : 52,6±4,9 ml/kg, VO :
53,9±6,2 ml/kg; p>0.05), dok pri P, iako mala, razlika u
primitku kisika bila je statistički značajna (VO :
45,6±5,2 ml/kg, VO : 47,7±5,2 ml/kg; p=0.03).
Korelacijskom analizom utvrđena je visoka povezanost
između svih parametara dvaju primijenjenih protokola (r
= 0.77-0.96, p<0.05), izuzev respiracijskog kvocijenta
(RQ) pri P i pri maksimalnom opterećenju (r=0.01-0.52,
p>0.05). RQ nije se razlikovao između testova pri P
(RQ : 0.98±0,04, RQ : 0,96±0,08; p>0.05), niti pri
maksimalnom opterećenju (RQ : 1.20±0,09, RQ :
1,25±0,11; p>0.05). Nešto niže vrijednosti RQ u odnosu
na vrijednosti opisane u trkača muškog spola mogu se
objasniti većim udjelom lipolize u žena uslijed razlika u
hormonalnom statusu. Rezultati istraživanja ukazuju da je
pri usporedbi rezultata progresivnih testova opterećenja
potrebno voditi računa o značajkama primijenjenog
protokola, odnosno duljini trajanja testa.The aim of this study was to compare different
indicators of aerobic capacity derived from two graded
treadmill exercise test protocols of different duration. Ten
female runners completed two graded treadmill tests to
exhaustion with increasing speed of : 1) 1 kmh /60 s (ST)
and 2) 1 kmh /30 s (KT). Spiroergometric parameters
were registered b and averaged to 30 s.
The second ventilatory (anaerobic) threshold (P) was
determined by the simplified method. The
maximum running speed (v : 17,1±1,4 kmh ; v :
19,4 ± 1,2 kmh ) and running speed at the P (v : 12,3
kmh ± 1,5; v : 13,8 ± 1,5 kmh ) differed significantly
between protocols (p<0.05), and were inversely related to
single stage and overall test duration. Heart rate value (FS)
at the maximum intensity was significantly lower in KT
(FS : 194,9±6,8 bpm; FS : 190,4±6,0 bpm; p=0,03)
which can be attributed to the inertia of cardiovascular
dynamics, while FS at P did not differ significantly
between protocols (FS : 178,2±8,7 bpm; FS :
175,2±10,9 bpm; p>0,05). Maximal oxygen uptake did
not differ between protocols (VO : 52,6±4,9 ml/kg,
VO : 53,9±6,2 ml/kg; p>0.05), while at the P, a small
but statistically significant difference was found (VO :
45,6±5,2 ml/kg, VO : 47,7±5,2 ml/kg; p=0,03).
Correlation analysis revealed high to very high
relationships between all test parameters (r = 0.77–0.96,
p<0.05), except for the respiratory exchange ratio (RQ) at
P and at maximum (r = 0.01-0.52, p>0.05). RQ did not
differ between tests at P (RQ : 0.98±0,04, RQ :
0,96±0,08; p>0.05) nor at maximum intensity (RQ :
1.20±0,09, RQ : 1,25±0,11; p>0.05). Lower values in
the RQ in relationship to values reported in the literature
for male runners may be explained by a relatively higher
share of energy for muscle work by oxidation of fats in
females compared to males, probably due to the influence
of gender specific hormonal status. The results of this
study indicate that test characteristics and overall test
duration should be considered when comparing results
obtained from different graded exercise test protocols
