Lactate kinetics in handcycling under various exercise modalities and their relationship to performance measures in able-bodied participants

Abstract

[Formula: see text]La was identified as a promising parameter for exercise testing in handcycling that can be supplemented by other parameters describing lactate kinetics following a sprint test.

Evaluation of a sport-specific field test to determine maximal lactate accumulation rate and sprint performance parameters in running

“…39 As previously found in handcycling, VLa max demonstrated a positive relationship to sprint performance parameters. 9 This seems to be reasonable since the turn-over of adenosine triphosphate (ATP) in non-oxidative glycolysis determines the rate of lactic metabolism. 40,41 However, the correlation betweenVLa max and t 100 is biased due to their mathematical dependency of the calculation approach described above.…”

“…[6][7][8] To compare approximation approaches (for t alac ), t alac was determined as t pmax−3.5% and interpolated according to previous research. 6,7,9 For exercises lasting 10.5 and 21.5 s, t alac was assumed to be 3 and 4 s, respectively. 6 Consequently, the interpolated t alac (t inter ) was calculated according to Eq.…”

“…As applied in cycling, t alac can be determined as the period when power output decreased by 3.5% (t pmax−3.5% ). 7,9 This approach requires the power-time course during the all-out exercise test. As a more practical approach, t alac can be interpolated according to findings in previous research.…”

“…14,[18][19][20][21] In summary, by knowing the acute velocity of the athlete during an all-out exercise of 10 to 15 s, external work components, power output and thus t pmax−3.5% can be determined to calculateVLa max in running. Even though the need for an adequate, reliable and practical parameter of anaerobic metabolism in running has been stressed by several authors 2,22 , VLa max and/or its training induced changes have only been examined in swimming [23][24][25][26] and cycling [7][8][9]27,28 .…”

Maximal Lactate Accumulation Rate in All-out Exercise Differs between Cycling and Running

“…Lactate kinetics following all-out exercise tests in cycling and running were interpolated using a modified biexponential time function as described in previous research (Eq. 2) [6,7].…”