In:
International Journal of Sports Physiology and Performance, Human Kinetics, Vol. 15, No. 10 ( 2020-11-1), p. 1400-1405
Abstract:
Purpose : To analyze the energetic profiles of the Yo-Yo Intermittent Recovery Tests 1 and 2 (YYIR1 and YYIR2). Methods : Intermittent running distance (IR1D and IR2D), time to exhaustion (IR1T and IR2T), and total recovery time between shuttles (IR1R and IR2R) were measured in 10 well-trained male athletes (age 24.4 [2.0] y, height 182 [1] cm, weight 75.8 [7.9] kg). Respiratory gases and blood lactate (BLC) were obtained preexercise, during exercise, and until 15 min postexercise. Metabolic energy, average metabolic power , and energy share (percentage of aerobic [ W AER ], anaerobic lactic [ W BLC ], and anaerobic alactic energy system [ W PCr ]) were calculated using the PCr-La-O 2 method. Results : Peak oxygen consumption was possibly higher in YYIR2 (60.3 [5.1] mL·kg −1 ·min −1 ) than in YYIR1 ( P = .116, 57.7 [4.5] mL·kg −1 ·min −1 , d = −0.58). IR1D, IR1T, and IR1R were very likely higher than IR2D, IR2T, and IR2R, respectively ( P 〈 .001, 1876 [391] vs 672 [132] m, d = −2.83; P 〈 .001, 916 [175] vs 304 [57] s, d = −3.03; and P 〈 .001, 460 [100] vs 150 [40] s, d = −2.83). Metabolic energy was most likely lower in YYIR2 than in YYIR1 ( P 〈 .001, 493.5 [118.1] vs 984.8 [171.7] kJ, d = 3.24). Average metabolic power was most likely higher in YYIR2 than in YYIR1 ( P 〈 .001, 21.5 [1.7] vs 14.5 [2.2] W·kg −1 , d = 3.54). When considering aerobic phosphocreatine restoration during breaks between shuttles, W AER ( P = .693, 49% [10%] vs 48% [5%] , d = −0.16) was similar, W PCr ( P = .165, 47% [11%] vs 42% [6%] , d = −0.54) possibly higher, and W BLC ( P 〈 .001, 4% [1%] vs 10% [3%] , d = 1.95) almost certainly lower in YYIR1 than in YYIR2. Conclusions : W AER and W PCr are predominant in YYIR1 and YYIR2 with almost identical W AER . Higher IR1D and IR1T in YYIR1 result in higher metabolic energy but lower average metabolic power and slightly lower peak oxygen consumption. Higher IR1R allows for higher reliance on W PCr in YYIR1, while YYIR2 requires a higher fraction of W BLC .
Type of Medium:
Online Resource
ISSN:
1555-0265
,
1555-0273
DOI:
10.1123/ijspp.2019-0702
Language:
Unknown
Publisher:
Human Kinetics
Publication Date:
2020
SSG:
31
