With research studies so easy to find on the Internet, fitness professionals are regularly bombarded by clients asking for interpretations.
Unfortunately, reading and interpreting scientific articles can get frustrating when terminology is unfamiliar and writing styles are wordy or awkward. Scientific journals try to communicate research findings as clearly as possible, but journals often use a highly stylized voice that makes it difficult for the applied professional to grasp the meaning of published studies.
Fitness professionals with a good grasp of common research methods and terminology (see Table 1) have a better chance of helping clients to make sense of scientific writing. The explanations that follow should make it easier for you to translate researchers’ conclusions into plain English:
What Does “Significant” Mean?
The term “significant”—or more correctly “statistical significance”—in a research study refers to the likelihood that certain test scores will occur. This in turn helps researchers understand whether their results are credible.
In exercise science research, statistical significance is typically stated at one of two probability (
≤ 0.05 or
≤ 0.01. Think of
≤ 0.05 as saying 95 times out of a 100 you will get this result (and 5 times out of a 100 you can get a chance result).
What’s the Difference Between Primary and Secondary Research?
Primary research starts with a research question (i.e., an unsolved problem the researcher is trying to unravel). This type of investigation follows a detailed process—the scientific method—that enables the researcher to develop a hypothesis and create an experiment to test it (see Figure 1). (Sometimes more than one question is posed.)
Before a primary research study is published in a journal, it goes through a strict peer review, in which two or more specialists in the field critically examine the article and recommend whether it should be accepted for publication. Many primary research journals now include a practical-applications section that synthesizes the useful insights gleaned from the study. This section usually appears at the end of the article.
By contrast, a secondary research study—such as a literature review or meta-analysis—collates, summarizes and analyzes existing research. Secondary research also goes through peer review before scientific journals will publish it.
Understanding Titles and Abstracts
Internet searches usually yield two categories of titles for research studies: the authoritative titles published in journals, and the “clickbait” headlines on articles summarizing the research. Researchers often spend an inordinate amount of time choosing their article’s title, which often provides a great glimpse into what the study is all about. Clickbait titles are another animal altogether: Designed mainly to generate online advertising revenue, they rarely have much to do with quality research. Be on guard for these sensational headlines as you conduct Internet research, and make sure your clients can distinguish between clickbait headlines and authoritative titles.
After the title, most research journal articles begin with an
—a brief summary of the purpose, methods, results and main conclusions of the study. Ideally, and most of the time, the abstract is a standalone synthesis of the entire paper and is easily accessed through Internet searches. However, as fitness pros have no doubt realized, reading complete research articles online sometimes requires paying a fee. A system like this that prevents Internet users from accessing full article content without a paid subscription to the webpage host (or without direct payment for access to the article) is called a “paywall.” Students and faculty at universities have library resources that bypass paywall systems.
What Are the Main Research Classifications?
Research is conducted in five basic categories:
1. Historical Research
This research explores past events for clues that can help us anticipate or explain future events. For example, improving our understanding of research into high-intensity exercise injuries has helped the fitness industry design safe and effective high-intensity programs for specific populations.
2. Descriptive Research
This research often collects information through data review, surveys, interviews or observation. In essence, descriptive research describes the way things are. A paper reviewing previously reported research is considered descriptive research. The feature on the health benefits of exercise, “35 Ailments, One Prescription: MOVE!,” in this issue of
IDEA Fitness Journal
is another example. Often, new ideas and theories are discovered and presented via the descriptive process.
3. Correlational Research
This research attempts to determine the relationship between two or more variables. The degree of the relationship is expressed as a correlation coefficient. For example, a researcher may try to determine the relationship between cardiorespiratory fitness and self-esteem in college women. As variables become more positively related, the correlation draws nearer to +1.00 (range is 0.0 to ±1.0). Unrelated variables produce a correlation near 0.0. If the correlation is near -1.00, the variables are inversely related. Eating and hunger, for example, have an inverse correlation: The more we eat, the less hunger we feel.
4. Causal-Comparative Research
This research hunts for cause-effect relationships between two or more groups. For instance, researchers may compare the body composition of people who have trained only with free weights with that of people who have trained only with exercise machines. Researchers do not manipulate variables: They investigate how training with free weights versus exercise machines affects body composition.
Obviously, because factors such as diet, training program and aerobic conditioning can affect body composition, causal-comparative research must be reviewed scrupulously to see how these other factors were controlled.
5. Experimental Research
This research starts with a hypothesis (maybe several)—an educated guess about how things work. Scientists then conduct an experiment to confirm or reject the hypothesis.
For instance, much of my latest research has been exploring the physiological effects of high-intensity interval training (HIIT). This happens in three key steps:
- First, I randomly select study groups from a population of healthy active men and women.
- Second, I choose the exercise programs to be tested (different work-to-rest intervals in HIIT), making sure the study controls all relevant factors (e.g., no other exercise programs are running during the testing; there is no change in diet; subjects are not taking supplements; and the health and fitness levels of subjects are similar, etc.).
- Third, I measure the effect of the different work-to-rest HIIT programs by analyzing specific variables such as kilocalorie expenditure, oxygen consumption, fat utilization, excess postexercise oxygen consumption, heart rate, blood pressure and postexercise lactate levels for each program.
Experimental research demands lots of time and resources, but it often produces the soundest evidence of cause-effect relationships. Experimental research should have a control group (subjects who do not get the treatment being studied). In my HIIT training research, for instance, steady-state exercise is the control trial, providing a benchmark against which to measure the test results.
Smith, J.A. 2015. Ten questions to ask about scientific studies. Accessed Oct. 25, 2015. http://reatergood.berkeley.edu/article/item/10_questions_to_ask_about_scientific_studies.