Gordon Dan, Gernigon Marie, Baker James, Merzbach Viviane, Scruton Adrian
Cambridge Centre for Sport and Exercise Sciences, Anglia Ruskin University , UK.
Faculty of Sport, University of Montpellier , France.
J Sports Sci Med. 2017 Mar 1;16(1):105-111. eCollection 2017 Mar.
The purpose of this study was to examine the effects of non-contingent feedback in the form of heart rate (HR) on the incidence of plateau at V̇O. Ten physically active males (age 24.8 yrs ± 4.2; mass 81.4 ± 9.0 kg; stature 1.80 ± 0.11 m, V̇O 53.2 ± 5.8 ml·kgmin) who were V̇O testing naïve but were cognisant as to the heart rate responses to exercise completed four incremental tests to volitional exhaustion, separated by ~72 h for the determination of V̇O and gas exchange threshold. The first trial served as a familiarisation with the remaining three being experimental conditions where HR was presented in a screen projection as either the actual response (HR-A) or 10 b·min higher than recorded (HR-H) or 10 b·min lower (HR-L). Throughout all trials V̇O was recorded on a breath-by-breath basis with plateau criteria of ≤ 50 ml·min.
A significant difference was observed for Δ V̇O over the final two consecutive 30s sampling periods between HR-A, both HR-L and HR-H (p = 0.049) and for the incidence of plateau response between condition (p = 0.021). An additional significant difference was observed for sub-maximal Δ V̇O responses between HR-A and HR-H (p = 0.049) and HR-A and HR-L (p = 0.006). Non-significant differences were observed for all other criteria. These data indicate that when presented with non-contingent feedback in the form of HR, that the perceptually orientated pacing schema becomes disrupted promoting a sparing of the finite anaerobic capacity to compensate for the imbalance between the afferent signal and perception of effort.
本研究的目的是检验心率（HR）形式的非条件反馈对摄氧量（V̇O）平台期发生率的影响。10名身体活跃的男性（年龄24.8岁±4.2；体重81.4±9.0千克；身高1.80±0.11米，V̇O 53.2±5.8毫升·千克·分钟），他们对V̇O测试不熟悉，但了解运动时的心率反应，完成了4次递增测试直至自愿疲劳，每次测试间隔约72小时，以确定V̇O和气体交换阈值。第一次试验用于熟悉测试，其余三次为实验条件，在屏幕投影中呈现的心率要么是实际反应（HR-A），要么比记录值高10次/分钟（HR-H），要么低10次/分钟（HR-L）。在所有试验中，逐次呼吸记录V̇O，平台期标准为≤50毫升/分钟。
在HR-A、HR-L和HR-H之间，连续最后两个30秒采样期的ΔV̇O存在显著差异（p = 0.049），不同条件下平台期反应的发生率也存在显著差异（p = 0.021）。在次最大ΔV̇O反应方面，HR-A与HR-H之间（p = 0.049）以及HR-A与HR-L之间（p = 0.006）也观察到显著差异。其他所有标准均未观察到显著差异。这些数据表明，当以HR形式呈现非条件反馈时，以感知为导向的配速模式会被打乱，从而促进有限无氧能力的节省，以补偿传入信号与努力感知之间的不平衡。
