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Five-Kilometers Time Trial: Preliminary Validation of a Short Test for Cycling Performance Evaluation.

Dantas JL, Pereira G, Nakamura FY - Asian J Sports Med (2015)

Bottom Line: These variables showed adequate sensitivity index (> 1).Coaches can detect performance changes through either absolute (± 17.7 W) or relative power output (± 0.3 W.kg(-1)), the time to complete the test (± 13.4 s) and the average speed (± 1.0 km.h(-1)).Furthermore, TT5km performance can also be used to rank the athletes according to their aerobic endurance fitness.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosciences and Imaging, Gabriele d'Annunzio University of Chieti-Pescara, Chieti, Italy ; Department of Physical Education, State University of Londrina, Londrina, Brazil.

ABSTRACT

Background: The five-kilometer time trial (TT5km) has been used to assess aerobic endurance performance without further investigation of its validity.

Objectives: This study aimed to perform a preliminary validation of the TT5km to rank well-trained cyclists based on aerobic endurance fitness and assess changes of the aerobic endurance performance.

Materials and methods: After the incremental test, 20 cyclists (age = 31.3 ± 7.9 years; body mass index = 22.7 ± 1.5 kg/m(2); maximal aerobic power = 360.5 ± 49.5 W) performed the TT5km twice, collecting performance (time to complete, absolute and relative power output, average speed) and physiological responses (heart rate and electromyography activity). The validation criteria were pacing strategy, absolute and relative reliability, validity, and sensitivity. Sensitivity index was obtained from the ratio between the smallest worthwhile change and typical error.

Results: The TT5km showed high absolute (coefficient of variation < 3%) and relative (intraclass coefficient correlation > 0.95) reliability of performance variables, whereas it presented low reliability of physiological responses. The TT5km performance variables were highly correlated with the aerobic endurance indices obtained from incremental test (r > 0.70). These variables showed adequate sensitivity index (> 1).

Conclusions: TT5km is a valid test to rank the aerobic endurance fitness of well-trained cyclists and to differentiate changes on aerobic endurance performance. Coaches can detect performance changes through either absolute (± 17.7 W) or relative power output (± 0.3 W.kg(-1)), the time to complete the test (± 13.4 s) and the average speed (± 1.0 km.h(-1)). Furthermore, TT5km performance can also be used to rank the athletes according to their aerobic endurance fitness.

No MeSH data available.


Serial Responses to Pacing of StrategiesSerial responses to pacing strategy of (A) heart rate, (B) power output, (C) quadriceps electromyography activity and (D) average speed every 500 meters during both TT5km. *, Significant difference of serial responses to pacing strategies between TT5km tests (interaction effect; P < 0.05). † Significant difference between TT5km tests (main effect; P < 0.05).
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fig22633: Serial Responses to Pacing of StrategiesSerial responses to pacing strategy of (A) heart rate, (B) power output, (C) quadriceps electromyography activity and (D) average speed every 500 meters during both TT5km. *, Significant difference of serial responses to pacing strategies between TT5km tests (interaction effect; P < 0.05). † Significant difference between TT5km tests (main effect; P < 0.05).

Mentions: Despite the differences in the average of performance variables, the pacing strategy did not differ significantly between TT5km tests to power output (F (3.03, 57.62) = 1.298; P = 0.284) and average speed (F (2.14, 40.71) = 0.298; P = 0.759). Heart rate (F (2.14, 40.71) = 0.298; P = 0.759) and RPE (F (4, 76) = 0.265; P = 0.900) serial responses to the pacing strategy were not significantly different between TT5km tests (interaction effect, Figure 2 and 3). Quadriceps electromyography serial responses showed significant difference between TT5km1 and TT5km2 (n = 17; F(2.07,33.13) = 6.485; P < 0.05) (interaction effect; Figure 2).


Five-Kilometers Time Trial: Preliminary Validation of a Short Test for Cycling Performance Evaluation.

Dantas JL, Pereira G, Nakamura FY - Asian J Sports Med (2015)

Serial Responses to Pacing of StrategiesSerial responses to pacing strategy of (A) heart rate, (B) power output, (C) quadriceps electromyography activity and (D) average speed every 500 meters during both TT5km. *, Significant difference of serial responses to pacing strategies between TT5km tests (interaction effect; P < 0.05). † Significant difference between TT5km tests (main effect; P < 0.05).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4594133&req=5

fig22633: Serial Responses to Pacing of StrategiesSerial responses to pacing strategy of (A) heart rate, (B) power output, (C) quadriceps electromyography activity and (D) average speed every 500 meters during both TT5km. *, Significant difference of serial responses to pacing strategies between TT5km tests (interaction effect; P < 0.05). † Significant difference between TT5km tests (main effect; P < 0.05).
Mentions: Despite the differences in the average of performance variables, the pacing strategy did not differ significantly between TT5km tests to power output (F (3.03, 57.62) = 1.298; P = 0.284) and average speed (F (2.14, 40.71) = 0.298; P = 0.759). Heart rate (F (2.14, 40.71) = 0.298; P = 0.759) and RPE (F (4, 76) = 0.265; P = 0.900) serial responses to the pacing strategy were not significantly different between TT5km tests (interaction effect, Figure 2 and 3). Quadriceps electromyography serial responses showed significant difference between TT5km1 and TT5km2 (n = 17; F(2.07,33.13) = 6.485; P < 0.05) (interaction effect; Figure 2).

Bottom Line: These variables showed adequate sensitivity index (> 1).Coaches can detect performance changes through either absolute (± 17.7 W) or relative power output (± 0.3 W.kg(-1)), the time to complete the test (± 13.4 s) and the average speed (± 1.0 km.h(-1)).Furthermore, TT5km performance can also be used to rank the athletes according to their aerobic endurance fitness.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosciences and Imaging, Gabriele d'Annunzio University of Chieti-Pescara, Chieti, Italy ; Department of Physical Education, State University of Londrina, Londrina, Brazil.

ABSTRACT

Background: The five-kilometer time trial (TT5km) has been used to assess aerobic endurance performance without further investigation of its validity.

Objectives: This study aimed to perform a preliminary validation of the TT5km to rank well-trained cyclists based on aerobic endurance fitness and assess changes of the aerobic endurance performance.

Materials and methods: After the incremental test, 20 cyclists (age = 31.3 ± 7.9 years; body mass index = 22.7 ± 1.5 kg/m(2); maximal aerobic power = 360.5 ± 49.5 W) performed the TT5km twice, collecting performance (time to complete, absolute and relative power output, average speed) and physiological responses (heart rate and electromyography activity). The validation criteria were pacing strategy, absolute and relative reliability, validity, and sensitivity. Sensitivity index was obtained from the ratio between the smallest worthwhile change and typical error.

Results: The TT5km showed high absolute (coefficient of variation < 3%) and relative (intraclass coefficient correlation > 0.95) reliability of performance variables, whereas it presented low reliability of physiological responses. The TT5km performance variables were highly correlated with the aerobic endurance indices obtained from incremental test (r > 0.70). These variables showed adequate sensitivity index (> 1).

Conclusions: TT5km is a valid test to rank the aerobic endurance fitness of well-trained cyclists and to differentiate changes on aerobic endurance performance. Coaches can detect performance changes through either absolute (± 17.7 W) or relative power output (± 0.3 W.kg(-1)), the time to complete the test (± 13.4 s) and the average speed (± 1.0 km.h(-1)). Furthermore, TT5km performance can also be used to rank the athletes according to their aerobic endurance fitness.

No MeSH data available.