Feasibility Study Of Muscle Oxygen Saturation To Evaluate Training Intensity In Rowers

Purpose:To explore the feasibility of muscle oxygen saturation?SmO₂?,as a local index,to evaluate training intensity in rowers,by the incremental load test,the different special training methods and the 2000m time trial of rowing.Methods:Twenty-six male rowers in Shanghai?19.15±2.84 yrs,189.19±6.18 cm,80.19±9.59 kg and train for 4.42±2.13yrs?volunteered to participate in the study.Participants completed three tests successively:incremental load test of rowing?form 180W,2min per step,increase 30W step by step,no interval until exhaustion?,SmO₂-BB,SmO₂-VL,oxygen uptake?V?O₂?,heart rate?HR?and Power measured at the same time during resting and testing;12000m training,6000m×2 training,30min training and 500m×10 training were selected as the different training methods of rowing,SmO₂-VL,HR,blood lactate?Bla?measured during resting,SmO₂-VL,HR,Power measured at the same time during testing,Bla,ratings of perceived exertion?RPE?measured immediately after training;during the 2000m rowing time trial,SmO₂-VL,HR,Bla measured during resting,SmO₂-VL,HR,Power measured at the same time during testing,RPE immediately measured after training and Bla measured at 3 minutes after training.Results:?1?SmO₂,as a local index,decreased gradually as the exercise intensity increased gradually during the incremental load test,while V?O₂ and HR,as the systemic indexes,increased gradually at the same time.There were highly significant negative correlations between SmO₂-BB,SmO₂-VL and V?O₂,HR respectively??0.822?r??0.797,p<0.01?.There was significant difference between steps in each index?p<0.05?.The correlations between SmO₂-BB and the systemice exercise intensity indexes were lower than SmO₂-VL,and the characterstics between the two showed a difference as the exercise intensity increased gradually?p<0.05?.?2?Power basically remained stable during the different special training methods,and HR increased gradually,while SmO₂-VL remained stable after falling to a certain level.There were moderately or highly significant negative correlations between SmO₂-VL and HR,Power respectively??0.862?r??0.652,p<0.01?.The indexes were not consistent in evaluating training intensity.?3?Power increased first,then decreased,and then increased again in the 2000m rowing time trial,and HR increased gradually,while SmO₂-VL decreased first,then remained stable,and then decreased again.There was highly significant negative correlation between SmO₂-VL and HR?r=?0.859,p<0.01?;and also highly significant negative correlation between SmO₂-VL and Power?r=?0.841,p<0.01?.The indexes were not consistent in evaluating erercise intensity.Conclusions:?1?The high correlations between SmO2-BB,SmO2-VL and systemic exercise intensity indexes during the incremental load test reflect its high sensitivity to exercise intensity.The correlations between SmO₂-VL and the exercise intensity indexes are higher than SmO₂-BB.It is considered that SmO2-BB,SmO2-VL all can be used as an evaluation index of local exercise intensity in rowers during incremental load test,and SmO₂-VL is better than SmO₂-BB.?2?There are moderate or high correlations between SmO₂-VL and the systemic exercise intensity index;the difference of the two reflects the difference between local exercise intensity and systemic exercise intensity in rowers during rowing training.It is considered that SmO₂-VL can be used as an evaluation index of local training intensity in rowers during rowing training.?3?There is a high correlation between SmO₂-VL and the systemic exercise intensity index during the 2000m rowing time trial;the difference of the two reflects the difference between local exercise intensity and systemic exercise intensity in rowers during rowing time trial.It is considered that SmO₂-VL can be used as an evaluation index of local exercise intensity in rowers during rowing time trial.?4?In view of the connection and difference betweenSmO2-BB,SmO2-VL and the systemic exercise intensity indexes,it is considered that SmO2-BB,SmO2-VL all can be used as a local evaluation index to evaluate the local exercise intensity during test,training and time trial in rowing.