It is likely that anyone who pays attention to fitness trends has heard the term"muscle confusion".It was invented and popularized in the past decade by the creators of various weight-training programs，particularly P90 X.
P90 X advises participants to adjust their routines all the time，threading in different combinations of exercises and rarely，if ever，repeating any particular workout.The theory for the inconstancy is that unfamiliar routines should perplex our bodies and muscles and prevent them from getting into a settled state or reaching a training plateau （a time of little change after a period of progress）.Instead，our muscles supposedly will respond to the unfamiliar demands of the workouts by continuing to adapt.
That idea has some appeal and many supporters but little independent scientific backing.So，for anew study，which was published in PLOS One，a group of of researchers from Spain and the United States who long had been interested in the impacts and specifics of resistance training decided to try to confuse a few muscles and see what would happen.
They divided 19 healthy young men who already lifted weights into two groups，after testing their muscles' size and strength and completing an online questionnaire about their interest in and motivation for exercise.
Then one group began a standard，weight-training routine，performing the same exercises in the same order each week.The other group，though，did a different workout each session，picking exercises randomly from a database of 80.These routines continued for eight weeks at a university gym，after which the men returned to the lab for new muscle tests and a repeat of the online questionnaire.
The researchers then compared results and，quite unexpectedly，found that it is no easy job to make muscles feel confused since overall the men's gains in muscular size and strength were almost exactly the same.Our muscles are not discouraged or bored by unvarying routines，says Brad Schoenfeld，a co-author of the study.
There was one notable difference between the groups，however.Those men completing the ever-changing workouts reported showing more enthusiasm for exercise at the study 's end than the other group. "The differences in drive scores at the end were significant，" he says，suggesting that "from a purely motivational standpoint，variety matters."
（1）The underlined word "perplex" can be replaced by DD.
A．pull
B．relax
C．strengthen.
D．confuse.
（2）What was the major difference between the two groups during the research？ AA
A．Whether their workouts varied.
B．Whether they received two muscle tests.
C．Whether exercises were completed at a gym.
D．Whether they lifted the same amount of weight.
（3）What did the researchers conclude from their study？DD
A．It is simple to confuse our muscles.
B．Men dislike ever-changing workouts.
C．Regular exercise makes one feel enthusiastic.
D．Changing workouts helps improve motivation.
（4）Which would be the best title for the text？ CC
A．Will P90 x benefit health？
B．How can muscles be built？
C．Will muscle confusion work？
D．How should workouts be done？
【答案】D；A；D；C
【解答】
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發(fā)布：2024/4/20 14:35:0組卷：1引用：3難度：0.5
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