A ‘ramp-sprint’ protocol to characterise indices of aerobic function and exercise intensity domains in a single laboratory test

Murgatroyd, Scott R.; Wylde, Lindsey A.; Cannon, Daniel T.; Ward, Susan A.; Rossiter, Harry B.

doi:10.1007/s00421-014-2908-8

Cited by 26 publications

(57 citation statements)

References 61 publications

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“…An important component of our comparison was the establishment of a rigorous estimate of critical power. Similar to our previous reports [13], the CI 95 for critical power measurement (within participant) was narrow. In our current experiment the span of CI 95 was 38 ± 26 W. Therefore, we are confident that the much wider limits of agreement in ▶ Fig.…”

Section: Discussionsupporting

confidence: 89%

“…We aimed to test whether a 30 s maximal isokinetic effort immediately following the limit of tolerance approximates critical power. We hypothesized that this short format test would provide an alternative to measuring critical power with multiple laboratory visits [2,8] or longer, more arduous exercise test formats, e. g. [9,11,13,17,18]. Our rationale was based on W′ depletion at intolerance and that the highest power subsequently sustainable would be critical power [13,15].…”

Section: Discussionmentioning

confidence: 99%

“…At the limit of tolerance to supra-critical-power exercise, and thus after depletion of W′, all-out sprint exercise approximates critical power [13]. Importantly, this appears to be the case with as little as 30-60 s of maximal effort [13]. During the ramp-sprint test, however, there is an inherent delay for power to resolve at a "steady state" following the initiation of the all-out sprint.…”

Section: Introductionmentioning

confidence: 95%

“…These include the 3 min 'all-out' exercise test with or without a prior ramp in the same laboratory visit [9][10][11][12]. Additionally, a ramp-sprint test was devised that comprises a 3 min "all-out" exercise bout immediately following the limit of tolerance to ramp exercise [13]. Interestingly, the profile of supra-critical-power exercise (ramp incremental, variable power such as the 3 min all-out test, constant power, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, the profile of supra-critical-power exercise (ramp incremental, variable power such as the 3 min all-out test, constant power, etc.) appears to be of little consequence for depletion of W′ [9,13,14], providing important flexibility in designing testing formats. The ramp-sprint test provides lactate threshold, V O 2max , and critical power in one laboratory visit with the premise being prior depletion of W′ during the ramp.…”

Section: Introductionmentioning

confidence: 99%

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Maximal Sustained Isokinetic Power at Exercise Intolerance is not Critical Power

et al. 2019

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The asymptote of the hyperbolic power-duration relationship, critical power (CP), demarcates sustainable from non-sustainable exercise. CP is a salient parameter within the theoretical framework determining exercise tolerance. However, measuring CP is time consuming – typically 4 constant-power exercise tests to intolerance, or a 3-min all-out sprint is required.To determine whether 30 s of maximal isokinetic cycling, immediately following the limit of tolerance, approximates CP.Fifteen participants (7 women, 8 men, 23±5 yr, 71±12 kg, V̇O2peak 4.39±1.04 L·min−1; 61±9 mL·kg·min−1) completed 4 constant supra-CP exercise tests to intolerance. Each test was followed immediately by a 30 s maximal isokinetic effort at 80 rpm. Mean isokinetic power was compared to the known CP.Mean±SD CP was 159±47 W (CI95 133, 185 W). Maximal isokinetic power immediately following intolerance was greater (p<0.05) than CP in all but one comparison (181±51 vs. 159±47 W; p>0.07). However, this closest estimation, following the longest duration constant-power test, resulted in 21 W of mean bias and wide limits of agreement (±84 W).Isokinetic power measured immediately following intolerance consistently overestimated critical power. Thus, an adjunct of 30 s maximal isokinetic cycling immediately following the limit of tolerance does not approximate critical power.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maximal Sustained Isokinetic Power at Exercise Intolerance is not Critical Power

et al. 2019

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Physiological and anthropometric determinants of critical power, W′ and the reconstitution of W′ in trained and untrained male cyclists

et al. 2020

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Purpose This study examined the relationship of physiological and anthropometric characteristics with parameters of the critical power (CP) model, and in particular the reconstitution of W′ following successive bouts of maximal exercise, amongst trained and untrained cyclists. Methods Twenty male adults (trained nine; untrained 11; age 39 ± 15 year; mass 74.7 ± 8.7 kg; V̇O2max 58.0 ± 8.7 mL kg−1 min−1) completed three incremental ramps (20 W min−1) to exhaustion interspersed with 2-min recoveries. Pearson’s correlation coefficients were used to assess relationships for W′ reconstitution after the first recovery (W′rec1), the delta in W′ reconstituted between recoveries (∆W′rec), CP and W′. Results CP was strongly related to V̇O2max for both trained (r = 0.82) and untrained participants (r = 0.71), whereas W′ was related to V̇O2max when both groups were considered together (r = 0.54). W′rec1 was strongly related to V̇O2max for the trained (r = 0.81) but not untrained (r = 0.18); similarly, ∆W′rec was strongly related to V̇O2max (r = − 0.85) and CP (r = − 0.71) in the trained group only. Conclusions Notable physiological relationships between parameters of aerobic fitness and the measurements of W′ reconstitution were observed, which differed among groups. The amount of W′ reconstitution and the maintenance of W′ reconstitution that occurred with repeated bouts of maximal exercise were found to be related to key measures of aerobic fitness such as CP and V̇O2max. This data demonstrates that trained cyclists wishing to improve their rate of W′ reconstitution following repeated efforts should focus training on improving key aspects of aerobic fitness such as V̇O2max and CP.

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The ramp and all-out exercise test to determine critical power: validity and robustness to manipulations in body position

2021

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Purpose The purpose of the present study was to determine whether a contiguous ramp and all-out exercise test could accurately determine critical power (CP) in a single laboratory visit during both upright and supine cycle exercise. Methods Healthy males completed maximal ramp-incremental exercise on a cycle ergometer in the upright (n = 15) and supine positions (n = 8), with task failure immediately followed by a 3-min all-out phase for determination of end-test power (EP). On separate days, participants undertook four constant-power tests in either the upright or supine positions with the limit of tolerance ranging from ~ 2 to 15 min for determination of CP. Results During upright exercise, EP was highly correlated with (R2 = 0.93, P < 0.001) and not different from CP (CP = 221 ± 40 W vs. EP = 226 ± 46 W, P = 0.085, 95% limits of agreement − 30, 19 W). During supine exercise, EP was also highly correlated with (R2 = 0.94, P < 0.001) and not different from CP (CP = 140 ± 42 W vs. EP = 136 ± 40 W, P = 0.293, 95% limits of agreement − 16, 24 W). Conclusion The present data suggest that EP derived from a contiguous ramp all-out exercise test is not different from the gold-standard method of CP determination during both upright and supine cycle exercise when assessed at the group level. However, the wide limits of agreement observed within the present study suggest that EP and CP should not be used interchangeably.

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A ‘ramp-sprint’ protocol to characterise indices of aerobic function and exercise intensity domains in a single laboratory test

Abstract: These data suggest that the key indices of aerobic function may be accurately and reliably estimated during a single exercise test. This test may provide a basis for simplifying assessment and prescription of exercise training and experimental interventions.

Cited by 26 publications

References 61 publications

Maximal Sustained Isokinetic Power at Exercise Intolerance is not Critical Power

Maximal Sustained Isokinetic Power at Exercise Intolerance is not Critical Power

Physiological and anthropometric determinants of critical power, W′ and the reconstitution of W′ in trained and untrained male cyclists

The ramp and all-out exercise test to determine critical power: validity and robustness to manipulations in body position

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